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data sheet rev. 1.00 / december 2012 zspm4551 high - efficiency charger for li - ion batter ies power and precision
zspm4551 high - efficiency charger for li - ion batter ies ? 201 2 zentrum mikr oelektronik dresden ag rev.1.00 december 4, 2012 . all rights reserved. the material c o ntained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without notice. for more information, contact zmdi via analog @zmdi.com . brief description the zspm4551 is a dc/dc synchronous switching lithium - ion ( li - i on ) b attery c harger with fully inte - grated power switch es, internal compensation, and full fault protection. its switching frequency of 1mhz enables the use of small filter components, resulting in smaller board space and reduced bom costs. in full - charge constant - current mode , the regula - tion is for constant current (cc) . once termination voltage is reached, the regulator operates in voltage mode. when the regulator is disabled ( the en pin is low), the de vice draws 10 a (typical) quiescent current. the zspm4551 includes supervisory reporting through the n flt ( i nverted f ault) open - drain output to interface other components in the system. device programming is achieved by an i2c ? * interface through the scl and sda pins. benefits ? up to 1.5a of continuous output current in full - charge constant - current (cc) m ode ? h igh efficiency C up to 92% with typical loads available support ? evaluation kit ? support documentation * i 2 c ? is a trademark of nxp. features ? v bat reverse - current blocking ? programmable temperature - compensated termination voltage : 3.94v to 4.18v 1% ? user programmable maximum charg e current: 50ma to 1500ma ? current mode pwm control in constant voltage ? supervisor for vbat reported at the n flt pin ? input supply under - voltage lockout ? full protection for over - current, over - temp erature , vbat over - voltage, and charging timeout ? charge stat us indication ? i 2 c ? program interface with eep rom registers related zmdi smart power products ? zspm4121 ultra - low power under - voltage switch ? zspm4141 ultra - low - power linear regulator physical characteristics ? wide input voltage range: v bat + 0.3v (3.5v min.) to 7.2v ? junction operating temperature: - 4 0c to 12 5c ? package: 16 - pin p qfn (4 mm x 4 mm ) zspm4551 application circuit c o u t l o u t r s e n s e r r e f b a t t e r y r t h m r p u l l u p ( o p t i o n a l ) v d d r p u l l u p ( o p t i o n a l ) v d d c v d d g n d e n v t h e r m s w n f l t v b a t s c l p g n d v i n s d a v t h _ r e f v s e n s e v d d z s p m 4 5 5 1 c i n
zspm4551 high - efficiency charger for li - ion batter ies ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 C december 4, 2012 all rights reserved. the material c o ntained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. typical applications ? portable battery chargers ? smart phones ? laptops ? tablet s/ e - readers zspm4551 block diagram ordering information ordering code description package zspm4551 aa1w zspm4551 high - efficiency li - ion battery ch arger 16 - pin pqfn / 7 reel (1000 parts) zspm4551 aa1r zspm4551 high - efficiency li - ion battery charger 16 - pin pqfn / 13 reel (3300 parts) zspm4551 kit zspm4551 evaluation kit sales and further information www.zmdi.c om analog@zmdi.com zentrum mikroelektronik dresden ag grenzstrasse 28 01109 dresden germany zmd america, inc. 1525 mccarthy blvd., #212 milpitas, ca 95035 - 7453 usa zentrum mikroelektronik dresden ag, japan office 2 nd floor, shinbashi tokyu bldg. 4 - 21 - 3, shinbashi, minato - ku tokyo, 105 - 0004 japan zmd far east, ltd. 3f, no. 51, sec. 2, keelung road 11052 taipei taiwan zentrum mikroelektronik dresden ag, korea office u - space 1 building 11th floor, unit ja - 1102 670 sa mpyeong - dong bundang - gu, seongnam - si gyeonggi - do, 463 - 400 korea phone +49.351.8822.7.776 fax +49.351.8822.8.7776 phone +855.275.9634 (usa) phone +408.883.6310 fax +408.883.6358 phone +81.3.6895.7410 fax +81.3.6895.7301 phone +886.2.2377.8189 fax +886.2.2 377.8199 phone +82.31.950.7679 fax +82.504.841.3026 disclaimer : this information applies to a product under development. its characteristics and specifications are subject to change witho ut notice. zentrum mikroelek tronik dresden ag (zmd ag) assumes no o bligation regarding future manufacture unless otherwise agreed to in writing. the information furnished hereby is believed to be true and accurate. however, under no circumstances shall zmd ag be liable to any customer, licensee, or any other third party f or any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arising out of or in any way related to the furnishing, performance, or use of this technical data. zmd ag hereby expressly d isclaims any liability of zmd ag to any customer, licensee or any other third party, and any such customer, licensee and any other third party hereby waives any liability of zmd ag for an y damages in connection with or arising out of the furnishing, performance or use of this technical data , whether based on contract, warranty, tort (including negligence), strict liability, or otherwise. v i n b a t t c u r r e n t c o n t r o l g a t e d r i v e g a t e d r i v e g a t e d r i v e c o n t r o l v b a t s w o s c i l l a t o r r a m p g e n e r a t o r c o m p a r a t o r e r r o r a m p g n d m o n i t o r & c o n t r o l b a t t t h e r m a l c o n t r o l o v e r - v o l t a g e p r o t e c t i o n v b a t v i n v i n ? e n p g n d n f l t c o u t l o u t b a t t e r y c o m p e n s a t i o n n e t w o r k v t h _ r e f v t h e r m v r e f v b a t r t h m r r e f r s e n s e v s e n s e c u r r e n t c o n t r o l s c l s d a v i n v d d c v d d v d d r e g u l a t o r v i n b a c k g a t e b l o c k i n g z s p m 4 5 5 1 i 2 c ? * i n t e r f a c e i 2 c ? * i s a t r a d e m a r k o f n x p .
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 4 of 30 contents 1 zspm4551 characteristics ................................ ................................ ................................ ................................ .. 6 1.1. absolute maximum ratings ................................ ................................ ................................ .......................... 6 1.2. thermal characteri stics ................................ ................................ ................................ ................................ 7 1.3. recommended operating conditions ................................ ................................ ................................ .......... 7 1.4. electrical characteristics ................................ ................................ ................................ .............................. 8 1.5. i 2 c? interface timing requirements ................................ ................................ ................................ ......... 11 2 functional description ................................ ................................ ................................ ................................ ....... 12 2.1. internal protection ................................ ................................ ................................ ................................ ...... 13 2.1.1. vin under - voltage lockout ................................ ................................ ................................ ................. 13 2.1.2. internal current limit ................................ ................................ ................................ ........................... 13 2.1.3. thermal shutdown ................................ ................................ ................................ ............................... 13 2.1.4. vbat over - voltage prot ection ................................ ................................ ................................ ............ 13 2.2. fault handling ................................ ................................ ................................ ................................ ............. 14 2.2.1. nflt pin functionality ................................ ................................ ................................ ......................... 14 2.2.2. other faults ................................ ................................ ................................ ................................ ......... 14 2.3. serial interface ................................ ................................ ................................ ................................ ........... 16 2. 3.1. i 2 c? subaddress definition ................................ ................................ ................................ ................ 16 2.3.2. i 2 c? bus operation ................................ ................................ ................................ ............................. 16 2.4. status and configuration registers ................................ ................................ ................................ ............ 18 3 application circuits ................................ ................................ ................................ ................................ ............ 23 3.1. typical application circui t ................................ ................................ ................................ .......................... 23 3.2. selection of external components ................................ ................................ ................................ ............. 23 3.2.1. c out output capacitor ................................ ................................ ................................ ......................... 23 3.2.2. l out output inductor ................................ ................................ ................................ ............................ 23 3.2.3. c in bypass capacitor ................................ ................................ ................................ ........................... 23 3.2.4. c vdd bypass capaci tor for vdd internal reference voltage output ................................ .................. 23 3.2.5. r sense output sensing resistor ................................ ................................ ................................ .......... 24 3.2.6. pull - up resistors ................................ ................................ ................................ ................................ .. 24 4 pin configuration and package ................................ ................................ ................................ ......................... 24 4.1. zspm4551 package dimensions ................................ ................................ ................................ ............... 24 4.2. pin - out assignments ................................ ................................ ................................ ................................ .. 25 4.3. pin description for 16 - pin pqfn (4 x 4 mm) ................................ ................................ ............................. 25 4.4. package markings ................................ ................................ ................................ ................................ ...... 26 5 layout recommendations ................................ ................................ ................................ ................................ . 27 5.1. multi - layer pcb layout ................................ ................................ ................................ .............................. 27 5.2. single - layer pcb layout ................................ ................................ ................................ ........................... 28 6 ordering information ................................ ................................ ................................ ................................ ......... 30 7 related documents ................................ ................................ ................................ ................................ ........... 30 8 document revision history ................................ ................................ ................................ ............................... 30
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 5 of 30 list of figures figure 2.1 zspm4551 block diagram ................................ ................................ ................................ .................. 12 figure 2.2 charging state diagram ................................ ................................ ................................ ...................... 15 figure 2.3 subaddress in i 2 c? transmission ................................ ................................ ................................ ...... 16 figure 2.4 i 2 c? start / stop protocol ................................ ................................ ................................ ................... 17 figure 2.5 i 2 c? data transmission timing ................................ ................................ ................................ ......... 17 figure 3.1 typical application circuit for charging a lithium - ion battery ................................ ............................ 23 figure 4.1 pqfn - 16 package dimensions ................................ ................................ ................................ ........... 24 figure 4.2 zspm 4551 pin assignments ................................ ................................ ................................ ............... 25 figure 4.3 marking diagram 16 - pin pqfn (4 x 4 mm) ................................ ................................ ......................... 26 figure 5.1 package and pcb land configuration for multi - layer pcb ................................ ............................... 27 figure 5.2 jedec standard fr4 multi - layer board C cross - sectional view ................................ ...................... 27 figure 5.3 conducting heat away from the die using an exposed pad package ................................ ............... 28 figure 5.4 application using a single - layer pcb ................................ ................................ ................................ 29 list of tables table 1.1 absolute maximum ratings ................................ ................................ ................................ ................... 6 table 1.2 thermal characteristics ................................ ................................ ................................ ......................... 7 table 1.3 recommend ed operating conditions ................................ ................................ ................................ ... 7 table 1.4 electrical characteristics ................................ ................................ ................................ ....................... 8 table 1.5 i 2 c? interface timing characteristics ................................ ................................ ................................ . 11 table 2.1 register descriptions (device address = 48 hex ) ................................ ................................ ................. 18 table 2.2 status register address 00 hex ................................ ................................ ................................ ..... 18 table 2.3 configuration register config1 address 02 hex ................................ ................................ ............. 19 table 2.4 configuration register config2 address 03 hex ................................ ................................ ............. 19 table 2.5 configuration register config3 address 04 hex ................................ ................................ ............. 20 table 2.6 configuration register config4 address 05 hex ................................ ................................ ............. 20 table 2.7 configuration register config5 address 06 hex ................................ ................................ ............. 21 table 2.8 e nable configuration register config_enable address 11 hex ................................ ................... 22 table 2.9 eeprom control register eeprom_ctrl address 12 hex ................................ ........................... 22 table 4.1 pin description ................................ ................................ ................................ ................................ ..... 25
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 6 of 30 1 zspm4551 characteristics important: stresses beyond those listed under absolute maximum ratings (section 1.1 ) may cause permanent damage to the devic e. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under r ecommended o perating c onditions is not implied. exposure to absolute C maximum C rated condit ions for extended periods may affect device reliability. 1.1. absolute maximum ratings over operating free C air temperature range unless otherwise noted . table 1 . 1 a bsolute maximum ratings parameter value 1) unit vin, en, nflt, scl, sda, vtherm, vth_ref, vbat, vsense - 0.3 to 8 v sw - 1 to 8.8 v vdd - 0.3 to 3.6 v operating junction temperature range, t j - 40 to 125 c storage temperature range, t stor - 65 to 150 c elect rostatic discharge C human body model 2) 2k v electrostatic discharge C machine model 2) +/ - 200 v lead temperature (soldering, 10 seconds) 260 c 1) all voltage valu es are with respect to network ground terminal. 2) esd testing is performed according to the respective jesd22 jedec standard.
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 7 of 30 1.2. thermal characteristics table 1 . 2 thermal characteristics parameter symbol value 1) unit thermal resistance junction to air 1) ? ja 50 c/w 1) assumes a 4x4mm qfn - 16 in 1 in 2 area of 2 oz . copper and 25 c ambient temperature. 1.3. recommended operating co nditions table 1 . 3 recommended o perating c onditions parameter symbol min typ max unit input operating voltage at vin pin v in v bat + 0.3v (3.5v min) 5.3 7.2 v sense resistor r sense 50 m ? output filter ind uctor typical value 1) l out 4.7 h output filter capacitor typical value 2) c out 4.7 f output filter capacitor esr c out - esr 100 m ? input supply bypass capac itor value 3) c in 3.3 10 f vdd supply bypass capacitor value 2) c vdd 70 100 130 nf operating free air temperature t a - 40 85 c operating junction temperature t j - 40 125 c 1) for best performance, use an inductor with a saturation current rating higher than the maximum v bat load requirement plus the inductor current ripple. 2) for best performance, use a low esr ceramic capacitor. 3) for best performance, use a low es r ce ramic capacitor. if c in is not a low esr ceramic capacitor, add a 0.1 f ceramic capacitor in parallel to c in .
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 8 of 30 1.4. electrical characteristics electrical c haracteristics t j = - 40c to 1 25c , vin = 5.3v, (unless otherwise noted) table 1 . 4 electrical c haracteristics parameter symbol condition min typ max unit vin supply voltage voltage input v in v bat + 0.3v (3.5v min) 5.3 7.2 v quiescent c urrent normal mode i cc - norm i load = 0a, no switching en ? 2.2v (high) 3 ma quiescent c urrent disabled mode i cc - - disable en = 0v 10 50 a vbat leakage leakage current from batt ery i bat - leak en = 0v, v v bat = 4.1v 10 a reverse current i bat - back vbat > vin, vbat = 4.1v, t j < 85 c 10 a vin under - voltage lockout inp ut supply under - voltage threshold v in - uv v in i ncreasing 3. 15 v input supply under - voltage threshold hysteresis v in - uv_hyst 100 200 mv osc oscillator frequency f osc 0.9 1 1.1 mhz n flt open drain output high - level output leakage i oh - n flt v n flt = 5.3v 0.1 a low - level output voltage v ol - n flt i n flt = - 1ma 0.4 v en/scl/sda input voltage thresholds high level input voltage v ih 2.2 v low level input voltage v il 0.8 v input hysteresis C en, scl, sda pins v hyst 200 mv
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 9 of 30 parameter symbol condition min typ max unit input leakage C en pin i in - en v en =vin 0.1 a v en =0v - 2.0 a input leakage C scl pin i in - scl v scl =vin 55 a v scl =0v - 0.1 a input leakage C sda pin i in - sda v sda =vin 0.1 a v sda =0v - 0.1 a low - level output voltage v ol - sda i sda = - 1ma 0.4 v therma l shutdown thermal shutdown junction temperature t sd 150 170 c tsd hysteresis t sd - hyst 10 c pre - charge end pre - c harge voltage threshold v prechg 2.9 3.0 3.1 v pre - c harge voltage hysteresis v pc - hyst 70 mv charge restart voltage b elow t erm ination for c harging r estart v restart 100 mv charging regulator with l out =4.7 h and c out =4.7 f output current limit tolerance in full - charge mode i bat - fc i bat is u ser programmable; see table 2 . 5 . i bat - 10% i bat i bat + 10% a termination voltage tolerance in top - off mod e v bat - to i bat = 0.1c, 0 c < t j < 85 c v bat is u ser programmable; see section 2.4 . v bat - 1% v bat v bat + 1% v top - off mode time out t to 0 120 m inutes full - charge timer t fc 200 1400 minutes timer accuracy t acc - 10% +10% high side switch on resistance r dson i sw = - 1a, t j =25 c 200 m? low side switch on resistance i sw = 1a, t j =25 c 250 m? max imum output current i bat 1.5 a over - cu rrent detect i ocd hs switch current 2.5 a v bat over - voltage threshold v bat - ov 101% v bat 102% v bat 103% v bat maximum duty cycle duty max 98 %
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 10 of 30 parameter symbol condition min typ max unit thermistor vth_ref o utput v oltage v vth_ref i vt_ref = 2 a to 100 a 1.22 v thermistor: 10k? temperatur e thresholds C =3434k 0c v therm threshold (0c) 0c decreasing temperature 75.6 %vth_ref 0c vtherm threshold with hysteresis (10c) 0c hyst increasing temperature 66.5 %vth_ref 10c vtherm threshold (10c) 10c decreasing temperature 66.2 %vth _ref 10c vtherm threshold with hysteresis (11c) 10c hyst increasing temperature 65.4 %vth_ref 45c vtherm threshold (45c) 45c increasing temperature 34.5 %vth_ref 45c vtherm threshold with hysteresis (44c) 45c hyst decreasing temperature 35.3 %vth_ref 50c vtherm threshold (50c) 50c increasing temperature 30.8 %vth_ref 50c vtherm threshold with hysteresis (49c) 50c hyst decreasing temperature 31.5 %vth_ref 60c vtherm threshold (60c) 60c increasing temperature 24.9 %vth_ref 60 c vtherm threshold with hysteresis (50c) 60c hyst decreasing temperature 30.8 %vth_ref thermistor: 100k? temperature thresholds C =4311k 0c vtherm threshold (0c) 0c decreasing temperature 80.5 %vth_ref 0c vtherm threshold with hysteresis (10 c) 0c hyst increasing temperature 69.8 %vth_ref 10c vtherm threshold (10c) 10c decreasing temperature 69.8 %vth_ref 10c vtherm threshold with hysteresis (11c) 10c hyst increasing temperature 68.6 %vth_ref 45c vtherm threshold (45c) 45c inc reasing temperature 31.3 %vth_ref 45c vtherm threshold with hysteresis (44c) 45c hyst decreasing temperature 32.3 %vth_ref
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 11 of 30 parameter symbol condition min typ max unit 50c vtherm threshold (50c) 50c increasing temperature 27.0 %vth_ref 50c vtherm threshold with hysteresis (49c) 50c hy st decreasing temperature 27.8 %vth_ref 60c vtherm threshold (60c) 60c increasing temperature 19.4 %vth_ref 60c vtherm threshold with hysteresis (50c) 60c hyst decreasing temperature 27.0 %vth_ref 1.5. i 2 c ? interface timing requirements electrical c haracteristics t j = - 40c to 125c, vin = 5.3v . see figure 2 . 5 for an illustration of the timing specifications given in table 1 . 5 . table 1 . 5 i 2 c ? interface timing characteristics parameter symbol standard mode fast mode 1) unit min max min max i 2 c ? c lock f requency f scl 0 100 0 400 khz i 2 c ? c lock h igh t ime t sch 4 0.6 s i 2 c ? c lock l ow t ime t scl 4.7 1.3 s i 2 c ? t olerable s pike t ime 2) t sp 0 50 0 50 ns i 2 c ? s erial d ata s etup t ime t sds 250 250 ns i 2 c ? s erial d ata h old t ime t sdh 0 0 s i 2 c ? i nput r ise t ime 2) t icr 1000 300 ns i 2 c ? i nput f all t ime 2) t icf 300 300 ns i 2 c ? o utput f all t ime; 10pf to 400 pf b us 2) t ocf 300 300 ns i 2 c ? b us f ree t ime b etween s top and start t buf 4.7 1.3 s i 2 c ? start or r epeated start c ondition s etup t ime t sts 4.7 0.6 s i 2 c ? start or r epeated start c ondition h old t ime t sth 4 0.6 s i 2 c ? stop c ondition s etup t ime 2) t sps 4 0.6 s 1) the i2c ? interface will operate in either standard or fast mode. 2) parameter not tested in production.
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 12 of 30 2 functional description the zspm4551 is a fully - integrated li - ion battery charger ic based on a highly - efficient switching topo logy. it is configurable for termination voltage, charge current , and additional variables to allow optimum charging conditions for a wide range of li - ion batteries. a 1 mhz internal switching frequency facilitates lo w - cost lc filter combinations. figure 2 . 1 provides a block diagram for the zspm4551. figure 2 . 1 zspm4551 block diagram when the battery voltage is below 3.0 volts, the zspm4551 enters a pre - charge state and applies a small, programmable charge current to safely charge the battery to a le vel for which full - charge current can be applied. once the full - charge mode has been initiated, the regulation will be for constant current (cc). when the battery voltage has increased enough to go into maintenance mode, the pwm control loop will force a c onstant voltage across the battery. once in constant voltage mode, current is monitored to determine when the battery is fully charged. see figure 2 . 2 for a diagram of the charging states. v i n b a t t c u r r e n t c o n t r o l g a t e d r i v e g a t e d r i v e g a t e d r i v e c o n t r o l v b a t s w o s c i l l a t o r r a m p g e n e r a t o r c o m p a r a t o r e r r o r a m p g n d m o n i t o r & c o n t r o l b a t t t h e r m a l c o n t r o l o v e r - v o l t a g e p r o t e c t i o n v b a t v i n v i n ? e n p g n d n f l t c o u t l o u t b a t t e r y c o m p e n s a t i o n n e t w o r k v t h _ r e f v t h e r m v r e f v b a t r t h m r r e f r s e n s e v s e n s e c u r r e n t c o n t r o l s c l s d a v i n v d d c v d d v d d r e g u l a t o r v i n b a c k g a t e b l o c k i n g z s p m 4 5 5 1 i 2 c ? * i n t e r f a c e i 2 c ? * i s a t r a d e m a r k o f n x p .
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 13 of 30 this regulation voltage as well as the 1c charging current can be set to change based on the battery temperature. there are four temperature ranges for which the regulation voltage can be set independently: 0 c to 10c, 10 c to 45c, 45 c to 50c, and 50 c to 60c. the zspm4551 w ill stop charging if the temperature passes the descending temperature threshold at 0c or the ascending threshold at 60c. these thresholds have 10 degrees of hysteresis. the intermediate points have 1 degree of hysteresis. 2.1. internal protection 2.1.1. vin under - voltage lockout the device is held in the off state until the en pin voltage is high ( ? 2.2v) and vin rises to 3.15v (typical). there is a 200mv hysteresis on this input, which requires the input to fall below 2.95v (typical) before the device will disable. 2.1.2. internal current limit the current through the inductor l out is sensed on a cycle - b y - cycle basis and if the current limit (i ocd ; see sec - tion 1.4 ) is reached, the zspm4551 will abbreviate the cycle. the c urrent limit is always active when the regulator is enabled. 2.1.3. thermal shutdown if the junc tion temperature of the zspm4551 exceeds 170c (typical), the sw output will tri - state to p rotect the device from damage. the n flt and all other protection circuitry will stay active to inform the system of the failure mode. once the device cools to 160c (typical), the device will attempt to start up again. if the device reaches 170c, the shutdown/restart sequence will repeat. 2.1.4. vbat over - voltage protection the zspm4551 has a battery protection circuit designed to shut down the charging profile if the batte ry voltage is greater than the termination voltage. the termination voltage can change based on user programming, so the protection threshold is set to 2% above the termination voltage. shutting down the charging profile puts the zspm4551 in a fault condit ion.
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 14 of 30 2.2. fault handling 2.2.1. n flt pin functionality in the event of a battery over - voltage, the battery temperature being outside of the safe charging range , or the full charge timer expiring, charging stops , and the n flt pin is pulled low. when the fault condition is no longer present, the device will enter the initialize state (see figure 2 . 2 ) , but the n flt pin will remain low until the status register (0 0 hex ) is read (see table 2 . 2 ) . when the status register is read, the n flt pin will go high until a new fault is detected. 2.2.2. other faults when an open thermistor, thermal shut down, vin under - voltage, or top - off time - out are detected, charging immediately stop s and the corresponding b it in the status register (00 hex ) is set. the device enters the initialize state until the fault is no longer detected.
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 15 of 30 figure 2 . 2 charging state diagram constant voltage mode full - charge constant current (cc) mode pre - charge state initialize state initialize waiting for valid charging conditions no p re - charge pre - charge current limit vbat > v prechg t hreshold yes no 1c charging 1c current limit and full - charge timer yes no faults & vbat < v restart vbat < v prechg threshold vbat = v termination & i charge < i eoc yes no yes no end of charge vbat regulated to v termination with eoc timer vbat = v termination no yes i charge < top off end current no en yes
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 16 of 30 2.3. s erial i nterface the zspm4551 features an i 2 c ? s lave interface that offers advanced c ontrol and diagnostic features. it supports standard and fast mode data rates and auto - sequencing, and it is compliant to i 2 c? standard version 3.0. i 2 c ? operation offers configuration control for termination voltages, charge currents, and charge timeouts. this configurability allows optimum charging conditions in a wide range of li - i on batteries. i 2 c ? operation also offers fault and warning indicators. whenever a fault is detected, the associated status bit in the stat us register is set a nd the n flt pin is pulled low. whenever a warning is detected, the associated status bit in the status register is set, but t he n flt pin is not pulled low. reading the status register resets the fault and warning status bits, and the n f lt pin is released after all fault status bits have been reset. 2.3.1. i 2 c ? s ubaddress d efinition figure 2 . 3 subaddress in i 2 c ? transmission 2.3.2. i 2 c ? b us o peration the zspm4551 s i 2 c ? is a two - wire serial interfa ce; the two lines are serial cloc k (scl) and serial data (sda) (see figure 2 . 4 ) . sda must be connected to a positive supply (e.g., the vdd pin) through an external pull - up resistor. the devices communicating on thi s bus can drive the sda line low or release it to high impedance. to ensure proper operation, setup and hold times must be met (see table 1 . 5 ) . the device that initiates the i 2 c ? transaction becomes the master of t he bus. communication is initiated by the master sending a start condition, which is a high - to - low transition on sd a while the scl line is high. after the start condition, the device address byte is sent, most significant bit (msb) first, including the da ta direction bit ( read = 1; write = 0 ). after receiving the valid address byte, the device respo nds with an acknowledge (ack). an ack is a low on sda during the high of the ack - related clock pulse. on the i 2 c ? bus, during each clock pulse , onl y one data bi t is transferred. the data on the sda line must remain stable during the high pulse of the clock period, as changes in the data line at this time are interpreted as start or stop control conditions . a low - to - high transition on sda while the scl input is hi gh indicates a stop condition and is sent by the master .
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 17 of 30 any number of data bytes can be transferred from the transmitter to receiver between the start and the stop conditions. each byte of eight bi ts is followed by one ack bit from the receiver . the sda l ine must be released by the transmitter before the receiver can send an ack bit. the receiver that acknowledges must pull down the sda line during the ack clock pulse, so that the sda line is stable low during the high pulse of the ack - related clock period . when a slave receiver is addressed, it must generate an ack after each byte is received. similarly, the master must generate an ack after each byte that it receiv es from the slave transmitter. an end of data is signaled by the master receiver to the slav e transmitter by not generating an acknowledge after the last byte has been clocked out of the slave. this is done by the master receiver by holding the sda line high. the transmitter must then release the data line to enable the master to generate a stop condition. figure 2 . 4 i 2 c ? s tart / stop protocol see table 1 . 5 for the definitions and specifications for the timing parameters labeled in figure 2 . 5 . figure 2 . 5 i 2 c ? data transmission timing
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 18 of 30 2.4. status and configuration registers table 2 . 1 register description s (device address = 4 8 hex ) register address name default description 0 00 hex status 00 hex status bit register 1 n/a n/a n/a register not implemented 2 02 hex config1 1) eeprom configuration register 3 03 hex config2 1) eeprom configuration register 4 04 hex config3 1) eeprom configuration register 5 05 hex config4 1) eeprom configuration register 6 06 hex config5 1) eeprom configuration register 7 - 16 n/a n/a n/a registers not implemented 17 11 hex config_enable 00 hex enable configuration register access 18 12 hex eeprom_ctrl 1) 00 hex ee prom control register 1) config x and eeprom_ctrl registers are only accessible when the config_enable register is written with the en_cfg bit set to 1 (see table 2 . 8 ) . table 2 . 2 status register address 00 hex note: all of t he status register bits are read - only. data bit d7 d6 d5 d4 d3 d2 d1 d0 field name batt_ov 1c_to temp_0c temp_60c tsd top_to vin_uv th_open field name bit definition 1) batt_ov vbat over - voltage . 1c_to full charge timer has timed out . temp_0c thermistor indicates battery temperature < 0c . temp_60c thermistor indicates battery temperature > 60c . tsd thermal shutdown . top_to top - o ff timer has timed out . vin_uv vin under - voltage . th_open thermistor o pen (battery not present) . 1) faults are defined as batt_ov, 1c_to, temp_0c, and temp_60c. warnings are defined as tsd , top_to, vin_uv, and th_open. faults cause the n flt pin to be pulled low . warnings do not cause the n flt pin to be pulled low. all status bits are clear ed after status register read access. the n flt pin will go to high impedance (open - drain output) after the status register has been read and all status bits have bee n reset.
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 19 of 30 table 2 . 3 configuration register config1 address 02 hex note: all of the config1 register bits are read/write . data bit d7 d6 d5 d4 d3 d2 d1 d0 field name pre_chrg[1:0] v_term_0_10[2:0] v_term_10_45[ 2:0] field name bit definition pre_chrg[1:0] 1) pre - charging configuration 00 bin C 50 ma 01 bin C 100 ma 10 bin C 185 ma 11 bin C 370 ma v_term_0_10[2:0] 2) voltage t ermination: 0 - 10c configuration 000 bin C 3.94 v 001 bin C 4.00 v 010 bin C 4.05 v 011 bin C 4.10 v 100 bin C 4.12 v 101 bin C 4.15 v 110 bin C 4.18 v 111 bin C invalid setting v_term_10_45[2:0] 2) voltage terminatio n: 10 - 45c configuration 1) pre_chrg note: maximum output current when v out < 3.0 v. 2) v_term note: there are separate settings for battery temperatures 0 - 10c, 10 - 45c, 45 - 50c , and 50 - 60c (see table 2 . 4 for 45 - 5 0c and 50 - 60c) . for <0c and >60c, charging is disabled and a fault is set. table 2 . 4 configuration register config2 address 03 hex note: all of the config2 register bits are read/write. data bit d7 d6 d5 d 4 d3 d2 d1 d0 field name eoc[1:0] v_term_45_50[2:0] v_term_50_60[2:0] field name bit definition eoc[1:0] 1) end of charge configuration 00 bin C 50 ma 01 bin C 100 ma 10 bin C 185 ma 11 bin C 370 ma v_term_45_50 [2:0] 2) voltage termination: 45 - 50c configuration 000 bin C 3.94 v 001 bin C 4.00 v 010 bin C 4.05 v 011 bin C 4.10 v 100 bin C 4.12 v 101 bin C 4.15 v 110 bin C 4.18 v 111 bin C invalid setting v_term_50_60[2:0] 2) voltage termination: 50 - 60c configuration 1) eoc note: maximum output current when v out < 3.0 v. 2) v_term note: there are separate settings for battery temper atures 0 - 10c, 10 - 45c, 45 - 50c , and 50 - 60c (see table 2 . 3 for 0 - 10c and 10 - 45c ). for <0c and >60c, charging is disabled and a fault is set.
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 20 of 30 table 2 . 5 co nfiguration register config3 address 04 hex note: all of the c onfig3 register bits are read/write. data bit d7 d6 d5 d4 d3 d2 d1 d0 field name max_chrg_curr_0_10[3:0] max_chrg_curr_10_45[3:0] field name bit definition max_chrg_curr_0_10[3:0] 1) maximum charge current: 0 - 10c configuration 0000 bin C 50 ma 0001 bin C 100 ma 0010 bin C 200 ma 0011 bin C 300 ma 0100 bin C 400 ma 0101 bin C 500 ma 0110 bin C 600 ma 0111 bin C 700 ma 1000 bin C 800 ma 1001 bin C 900 ma 1010 bin C 1000 ma 1011 bin C 1100 ma 1100 bin C 1200 ma 1101 bin C 13 00 ma 1110 bin C 1400 ma 1111 bin C 1500 ma max_chrg_curr_10_45[3:0] 1) maximum charge current; 10 - 45c configuration 1) max_chrg_curr note: there are separate settings for battery temper atures 0 - 10c, 10 - 45c, 4 5 - 50c , and 50 - 60c (see table 2 . 6 for 45 - 50c and 50 - 60c). for <0c and >60c, charging is disabled and a fault is set. table 2 . 6 configuration register config4 ad dress 05 hex note: all of the config4 register bits are read/write. data bit d7 d6 d5 d4 d3 d2 d1 d0 field name max_chrg_curr_45_50[3:0] max_chrg_curr_50_60[3:0] field name bit definition max_chrg_curr_45_50[3:0] 1) maximum charge current: 45 - 50c configuration 0000 bin C 50 ma 0001 bin C 100 ma 0010 bin C 200 ma 0011 bin C 300 ma 0100 bin C 400 ma 0101 bin C 500 ma 0110 bin C 600 ma 0111 bin C 700 ma 1000 bin C 800 ma 1001 bin C 900 ma 1010 bin C 1000 ma 1011 bin C 1100 m a 1100 bin C 1200 ma 1101 bin C 1300 ma 1110 bin C 1400 ma 1111 bin C 1500 ma max_chrg_curr_50_60[3:0] 1) maximum charge current: 50 - 60c configuration 1) max_chrg_curr note: there are separate settings for battery temperatures 0 - 10c, 10 - 45c, 45 - 50c , and 50 - 60c (see table 2 . 5 for 0 - 1 0c and 10 - 45c). for <0c and >60c, charging is disabled and a fault is set.
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 21 of 30 table 2 . 7 c onfiguration register config5 address 06 hex note: all of the config5 register bits are read/write. data bit d7 d6 d5 d4 d3 d2 d1 d0 field name top_end th top_to[2:0] 1c_to[2:0] field name bit definition top_end 1) top - o ff end configuration 0 bin C 25 ma 1 bin C 92 ma th 2) thermistor configuration 0 bin C 10k ? 1 bin C 100k ? top_to[2:0] 3) top o ff timer time out configuration 000 bin C 0 minutes 001 bin C 20 minutes 010 bin C 40 minutes 011 bin C 60 minutes 100 bin C 80 minutes 101 bin C 100 minutes 110 bin C 120 minutes 11 1 bin C disable time out timer 1c_to[2:0] 4) full charge timer time out configuration 000 bin C disable full charge timer 001 bin C 200 minutes 010 bin C 400 minutes 011 bin C 600 minutes 100 bin C 800 minutes 101 bin C 1000 minutes 110 bin C 1200 minutes 111 bin C 1400 minutes 1) top_end note: charging stops when v v bat = v termination and i bat < top_end 2) th note: setting for nominal thermistor and reference resistor value. 3) top_to note: timer starts when vbat = v termination and i bat < eoc. 4) 1c_to note: timer starts when vbat > 3.0v.
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 22 of 30 table 2 . 8 enable configuration register config_enable address 11 hex note: the reset value for all of the config_enable register bits is 0. data bit d7 d6 d5 d4 d3 d2 d1 d0 field name not used not used not used not used not used not used not used en_cfg read/write r r r r r r r r/w field name bit definition en_cfg enable - access control bit for configuration registers config1 through config5 (addre sses 02 hex to 06 hex ) 0 bin C disable access 1 bin C enable access table 2 . 9 eeprom control register eeprom_ctrl address 12 hex note: the reset value for all of the eeprom_ctrl register bits is 0. data bit d7 d6 d5 d4 d3 d2 d1 d0 field name not used not used not used not used not used not used not used ee_prog read/write r r r r r r r r/w field name bit definition ee_prog 1) ee prom program control bit for configu ration registers config1 through config5 (addresses 02 hex to 06 hex ) 0 bin C disable ee prom programming 1 bin C enable ee prom programming with da ta from configuration registers config1 through config5 (addresses 02 hex to 06 hex ) 1) ee_prog note: inputs vin and en must be present for 200 ms.
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 23 of 30 3 application circuits 3.1. typical application circuit figure 3 . 1 typical application circuit for charging a lithium - i on batter y 3.2. selection of external components note that the in ternal compensation is optimized for a 4.7 f output capacitor (c out ) and a 4.7 h output inductor (l out ). table 1 . 3 provides recommended ranges for most of the following components. 3.2.1. c out output capacitor to keep the output ripple low, a low esr (less than 35m ? ) ceramic capacitor is recommended for the 4.7 f output filter capacitor. the esr should not exceed 100m ?. 3.2.2. l out output inductor for best performance, an inductor with a saturation current rating higher than the maximum v out load requirement plus the induc tor current ripple should be used for the 4.7 h output filter inductor. 3.2.3. c in bypass capacitor for best performance, a low esr ceramic capacitor should be used for the 10 f input supply bypass capacitor. if it is not a low esr ceramic capacitor, a 0.1 f ce ramic capacitor should be added in parallel to c in . 3.2.4. c vdd bypass capacitor for vdd internal reference voltage output for best performance, a low esr ceramic capacitor should be used for the 100nf bypass capacitor from the vdd pin to ground. c o u t l o u t r s e n s e r r e f b a t t e r y r t h m r p u l l u p ( o p t i o n a l ) v d d r p u l l u p ( o p t i o n a l ) v d d c v d d g n d e n v t h e r m s w n f l t v b a t s c l p g n d v i n s d a v t h _ r e f v s e n s e v d d z s p m 4 5 5 1 c i n
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 24 of 30 3.2.5. r sense output se nsing resistor the typical value for the output sensing resistor is 50m ? . 3.2.6. pull - up resistors for proper function of the i 2 c ? interface, the sda pin must be connected to a positive supply (e.g., the vdd pin) through an external pull - up resistor. for proper f unction of the fault warning signal on the n flt pin, it must be connected to a positive supply (vdd) through an external pull - up resistor. 4 pin configuration and package 4.1. zspm4551 package dimensions figure 4 . 1 p qfn - 16 p ackage d imensions
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 25 of 30 4.2. pin - o ut assignments figure 4 . 2 zspm4551 pin assignments 4.3. pin description for 16 - pin p qfn ( 4 x 4 mm ) table 4 . 1 pin d escription pin # name function description 1 sw switching voltage node connect to 4.7 h (typical) inductor l out . also connect to additional sw pin 14. 2 vin input voltage input voltage. also connect to c in . also connect to additional vin p in 11. 3 vsense current sense positive input positive input for the current loop. 4 vbat output voltage regulator f eedback i nput . 5 gnd gnd primary ground for the majority of the device except the low - side power fet. 6 en enable input when en is high ( ? 2.2v) , the device is en abled. ground the pin to disable the device. includes internal pull - up. 7 n flt inverted fault open - drain output. 8 vdd internal 3.3v supply output connect to a 100nf capacitor to gnd . 9 vtherm battery temperature sensor minus n ode negative node for the thermistor , which must be located in close proximity to the battery. s w s d a p g n d p g n d 1 3 1 4 1 5 1 6 v i n s w v s e n s e v b a t 1 2 3 4 n f l t v d d e n g n d 8 7 6 5 v i n s c l v t h _ r e f v t h e r m 1 2 1 1 1 0 9 z s p m 4 5 5 1 p q f n 1 6 4 x 4 t o p v i e w
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 26 of 30 pin # name function description 10 vth_ref battery temperature sensor positive node positive node for the thermistor , which must be located in close proximity to the battery . 11 vin input vol tage additional vin pin for input voltage; connect to vin pin 2. 12 scl clock input i 2 c ? clock input. 13 sda data input/output i 2 c ? data ( open - drain output ) . 14 sw switching voltage node additional sw pin; connect to sw pin 1. 15 pgnd power gnd gnd sup ply for internal low - side fet/integrated diode. also connect to additional pgnd pin 16. 16 pgnd power gnd gnd supply for internal low - side fet/integrated diode. also connect to additional pgnd pin 15. 4.4. package markings figure 4 . 3 marking diagram 16 - pin p qfn (4 x 4 mm) xxxxx: lot number (last five digits) o: pin 1 mark yy: year ww: work week 45 51 a xxxxx oyyww
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 27 of 30 5 layout recommendations to maximize the efficiency of this package for application on a single layer or mu lti - layer pcb, certain guidelines must be followed when laying out this part on the pcb. 5.1. multi - layer pcb layout the following are guidelines for mounting the exposed pad zspm4551 on a multi - layer pcb with ground a plane. in a multi - layer board application, the thermal vias are the primary method of heat transfer from the package thermal pad to the internal ground plane. the efficiency of this method depends on several factors, including die area, number of thermal vias, and thickness of copper, etc. figure 5 . 1 package and pcb land configuration for multi - layer pcb figure 5 . 2 jedec standard fr4 multi - layer board C cross - sectional view package thermal pad solder pad ( land pattern ) thermal vias package outline ( square ) package solder pad package solder pad ( bottom trace ) thermal via component traces thermal isolation power plane only 1 . 5748 mm 0 . 0 - 0 . 071 mm board base & bottom pad 0 . 5246 - 0 . 5606 mm power plane ( 1 oz cu ) 1 . 0142 - 1 . 0502 mm ground plane ( 1 oz cu ) 1 . 5038 - 1 . 5748 mm component trace ( 2 oz cu ) 2 plane 4 plane
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 28 of 30 figure 5 . 3 is a representation of how the heat can be conducted away from the die using an exposed pad package. each application will have different requirements and limitations, and therefore the user should use sufficient copper to dissipate the power in the system. the output current rating for the linear regulators might need to be de - rated for ambient temperatures above 85 c. the de - rated value will depend on calculated worst cas e power dissipation and the thermal management implementation in the application. figure 5 . 3 conducting heat away from the die using an exposed pad package 5.2. single - layer pcb layo ut layout recommendations for a single - layer pcb: utilize as much copper area for power management as possible. in a single - layer board application, the thermal pad is attached to a heat spreader (copper areas) by using a low thermal impedance attachment m ethod (solder paste or thermal conductive epoxy). in both of the methods mentioned above, it is advisable to use as much copper trace as possible to dissipate the heat. mold compound die epoxy die attach exposed pad solder thermal vias with cu plating single layer , 2 oz cu ground layer , 1 oz cu signal layer , 1 oz cu bottom layer , 2 oz cu 20 % cu coverage 90 % cu coverage 5 % - 10 % cu coverage note : not to scale .
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 29 of 30 figure 5 . 4 application using a single - l ayer pcb important: if the attachment method is not implemented correctly, the functionality of the product is not guaranteed. power dissipation capability will be adversely affected if the device is incorrectly mounted onto the circuit board. use as much copper area as possible for heat spread package thermal pad package outline
zspm4551 high - efficiency charger for li - ion batter ies data sheet december 4, 2012 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior w ritten consent of the copyright owner. the information furnished in this publicatio n is s ubject to changes without notice. 30 of 30 6 ordering information ordering code description package zspm4551 aa1w zspm4551 high - efficiency charger for li - ion batter ies 16 - pin pqfn / 7 reel (1000 parts) zspm4551 aa1r zspm4551 high - efficiency charger for li - ion batteries 16 - pin pqf n / 13 reel (3300 parts) zspm4551 kit zspm4551 evaluation kit 7 related documents document file name zspm4551 feature sheet zspm4551 _feature_sheet_r evx_xy.pdf zspm4551 evaluation kit description zspm4551 _eval_kit_ manual _ r evx_xy.pdf zspm4551 application note C li - ion battery charging applications zspm4551_app_note_li - ion_batt_charging_ r evx_xy.pdf visit zmdis website www.zmdi.com or contact your nearest sales office for the latest version of these documents. 8 document revision history revision date description 1.00 december 4, 2012 first r elease . sales and further information www.zmdi.com analog@zmdi.com zentrum mikroelektronik dresden ag grenzstrasse 28 01109 dresden germany zmd america, inc. 1525 mccarthy blvd., #212 milpitas, ca 95035 - 7453 usa zentrum mikroelektronik dresden ag, japan office 2nd floor, shinbashi tokyu bldg. 4 - 21 - 3, shinbashi, minato - ku tokyo, 105 - 0004 japan zmd far east, ltd. 3f, no. 51, sec. 2, keelung road 11052 taipei taiwan zentrum mikroelektronik dresden ag, korea office u - space 1 building 11th floor, unit ja - 1102 670 sampyeong - dong bundang - gu, seongnam - si gyeonggi - do, 463 - 400 korea phone +49.351.8822.7.776 fax +4 9.351.8822.8.7776 phone +855.275.9634 (usa) phone +408.883.6310 fax +408.883.6358 phone +81.3.6895.7410 fax +81.3.6895.7301 phone +886.2.2377.8189 fax +886.2.2377.8199 phone +82.31.950.7679 fax +82.504.841.3026 disclaimer : this information applies to a p roduct under development. its characteristics and specifications are subject to change without notice. zentrum mikroelek tronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. the information fu rnished hereby is believed to be true and accurate. however, under no circumstances shall zmd ag be li able to any customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of a ny kind or nature whatsoever arising out of or in any way related to the furnishing, performance, or use of this technical data. zm d ag hereby expressly disclaims any liability of zmd ag to any customer, licensee or any other third party, and any such customer, licensee and any other third party hereby waives any liability of zmd ag for an y damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warranty, tort (including negligence), strict liability , or otherwise.

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