njm2873 -1- ver.2006-02-22 low dropout voltage regulator general description package outline the njm2873 is low dropout voltage regulator designed for cellular phone application. advanced bipolar technology achieves low noise, high ripple rejection and low quiescent current. features high ripple rejection 70db typ. (f=1khz) output noise voltage vno=30 vrms (cp=0.01 f) output capacitor with 1.0 f ceramic capacitor (vo 2.7v) output current io(max.)=150ma high precision output vo 1% low dropout voltage 0.10v typ. (io=60ma) on/off control (active high) internal short circuit current limit internal thermal overload protection bipolar technology package outline ffp12-b1 (2.02.00.85mm) pin configuration equivalent circuit v out gnd v in thermal protection bandgap reference noise bypass cont njm2873pb1 pin function 1. v in 7. gnd 2. v in 8. noise bypass 3. v in 9. nc 4. control 10. v out 5. gnd 11. v out 6. gnd 12. v out njm2873pb1 top 1 2 3 4 5 6 7 8 9 10 11 12 3 2 1 12 9 8 7 6 5 4 11 10 bottom
njm2873 - 2 - ver.2006-02-22 output voltage rank list device name v out njm2873pb1-21 2.1v njm2873pb1-25 2.5v njm2873pb1-26 2.6v njm2873pb1-27 2.7v NJM2873PB1-28 2.8v NJM2873PB1-285 2.85v njm2873pb1-03 3.0v njm2873pb1-33 3.3v njm2873pb1-38 3.8v njm2873pb1-05 5.0v absolute maximum ratings (ta=25 c) parameter symbol ratings unit input voltage v in +14 v control voltage v cont +14(*1) v power dissipation p d 300(*2) mw operating temperature topr ? 40 +85 c storage temperature tstg ? 40 +125 c (*1): when input voltage is less than +14v, the absolute maximum control voltage is equal to the input voltage. (*2): on board. 25mm 25mm 0.2mm electrical characteristics (v in =vo+1v, c in =0.1uf, co=1.0uf: vo 2.7v (co=2.2uf: vo 2.6v), cp=0.01uf, ta=25 c) parameter symbol test condition min. typ. max. unit output voltage vo io=30ma -1% ? +1% v quiescent current i q io=0ma, expect icont ? 120 180 a quiescent current at control off i q(off) v cont =0v ? ? 100 na output current io vo - 0.3v 150 200 - ma line regulation ? vo/ ? v in v in =vo+1v vo+6v, io=30ma ? ? 0.10 %/v load regulation ? vo/ ? io io=0 100ma ? ? 0.03 %/ma dropout voltage ? v i ? o io=60ma ? 0.10 0.18 v ripple rejection rr ein=200mvrms,f=1khz, io=10ma vo=3v version ? 70 ? db average temperature coefficient of output voltage ? vo/ ? ta ta = 0 85 c, io=10ma ? 50 ? ppm/ c output noise voltage v no f=10hz 80khz, io=10ma, vo=3v version ? 30 ? vrms control voltage for on-state v cont(on) 1.6 ? ? v control voltage for off-state v cont(off) ? ? 0.6 v the above specification is a common specification for all output voltages. therefore, it may be different from the individual specification for a specific output voltage.
njm2873 - 3 - ver.2006-02-22 test circuit i cont v cont a v cp=0.01f v 1.0f *3 (ceramic) v out i out 0.1f v in i in a njm2873 control gnd v in v out v in v out noise bypass nc v in v out gnd gnd *3 vo
njm2873 - 4 - ver.2006-02-22 typical application 1 in the case where on/off control is not required: connect control terminal to v in terminal 0.1f r (0 ~ 300k ? ) v in v out njm2873 control gnd v in v out v in v out noise bypass nc gnd gnd v in v out *4 vo
njm2873 - 5 - ver.2006-02-22 2 in use of on/off control: state of control terminal: ? ?h? output is enabled. ? ?l? or ?open? output is disabled. noise bypass capacitance cp noise bypass capacitance cp reduces noise generated by band-gap reference circuit. noise level and ripple rejection will be improved when larger cp is used. use of smaller cp value may cause oscillation. use the cp value of 0.01 f greater to avoid the problem. in the case of using a resistance "r" between v in and control. the current flow into the control terminal while the ic is on state (i cont ) can be reduced when a pull up resistance "r" is inserted between v in and the control terminal. the minimum control voltage for on state (v cont (on) ) is increased due to the voltage drop caused by i cont and the resistance "r". the i cont is temperature dependence as shown in the "control current vs. temperature" characteristics. therefore, the resistance "r" should be carefully selected to ensure the control voltage exceeds the v cont (on) over the required temperature range. cp=0.01f 0.1f r (0 ~ 300k ? ) v in v out njm2873 control gnd v in v out v in v out noise bypass nc gnd gnd v in v out *4 vo
njm2873 - 6 - ver.2006-02-22 electrical characteristics
njm2873 -7- ver.2006-02-22 electrical characteristics
njm2873 - 8 - ver.2006-02-22 electrical characteristics 0 2 4 6 8 10 -50 0 50 100 control current : i cont ( a) temperat ure ta ( o c) njm 2873_ 3. 0v control current v.s. temperature @:v in =4v output is open. co=1 f(ceramic) cp=0.01 f v cont =1.6v
njm2873 - 9 - ver.2006-02-22 [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.
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