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| MIC94040/1/2/3 28m? r dson 3a high side load switch in 1.2mm x 1.2mm mlf package m l f a n d m i c r o l e a d f r a m e i s a r e g i s t e r e d t r a d e m a r k o f a m k o r t e c h n o l o g y , i n c . micrel inc. ?2180 fortune drive ?san jose, ca 95131 ?usa ?tel +1 ( 408 ) 944-0800 ?fax + 1 (408) 474-1000 ?http://www.micrel.com may 2008 m9999-053008-a general description t h e m i c 9 4 0 4 0 / 1 / 2 / 3 i s a f a m i l y o f h i g h - s i d e l o a d s w i t c h e s d e s i g n e d t o o p e r a t e f r o m 1 . 7 v t o 5 . 5 v i n p u t v o l t a g e . t h e l o a d s w i t c h p a s s e l e m e n t i s a n i n t e r n a l 2 8 m ? r d s o n p - c h a n n e l m o s f e t w h i c h e n a b l e s t h e d e v i c e t o s u p p o r t u p t o 3 a o f c o n t i n u o u s c u r r e n t . a d d i t i o n a l l y , t h e l o a d s w i t c h s u p p o r t s 1 . 5 v l o g i c l e v e l c o n t r o l a n d s h u t d o w n f e a t u r e s i n a t i n y 1 . 2 m m x 1 . 2 m m 4 p i n m l f p a c k a g e . t h e m i c 9 4 0 4 0 a n d m i c 9 4 0 4 1 f e a t u r e r a p i d t u r n o n , w h i l e t h e m i c 9 4 0 4 2 a n d m i c 9 4 0 4 3 p r o v i d e a s l e w r a t e c o n t r o l l e d s o f t - s t a r t t u r n - o n o f 1 0 0 s . t h e s o f t - s t a r t f e a t u r e i s p r o v i d e d t o p r e v e n t a n i n - r u s h c u r r e n t e v e n t f r o m p u l l i n g d o w n t h e i n p u t s u p p l y v o l t a g e . t h e m i c 9 4 0 4 1 a n d m i c 9 4 0 4 3 f e a t u r e a n a c t i v e l o a d d i s c h a r g e c i r c u i t w h i c h s w i t c h e s i n a 2 0 0 ? l o a d w h e n t h e s w i t c h i s d i s a b l e d t o a u t o m a t i c a l l y d i s c h a r g e a c a p a c i t i v e l o a d . a n a c t i v e p u l l - d o w n o n t h e e n a b l e i n p u t k e e p s t h e m i c 9 4 0 4 0 / 1 / 2 / 3 i n a d e f a u l t o f f s t a t e u n t i l t h e e n a b l e p i n i s p u l l e d a b o v e 1 . 2 v . i n t e r n a l l e v e l s h i f t c i r c u i t r y a l l o w s l o w v o l t a g e l o g i c s i g n a l s t o s w i t c h h i g h e r s u p p l y v o l t a g e s . t h e e n a b l e v o l t a g e c a n b e a s h i g h a s 5 . 5 v a n d i s n o t l i m i t e d b y t h e i n p u t v o l t a g e . t h e m i c 9 4 0 4 0 / 1 / 2 / 3 o p e r a t i n g v o l t a g e r a n g e m a k e s t h e m i d e a l f o r l i t h i u m i o n a n d n i m h / n i c a d / a l k a l i n e b a t t e r y p o w e r e d s y s t e m s , a s w e l l a s n o n - b a t t e r y p o w e r e d a p p l i c a t i o n s . t h e d e v i c e s p r o v i d e l o w q u i e s c e n t c u r r e n t a n d l o w s h u t d o w n c u r r e n t t o m a x i m i z e b a t t e r y l i f e . d a t a s h e e t s a n d s u p p o r t d o c u m e n t a t i o n c a n b e f o u n d o n m i c r e l s w e b s i t e a t : w w w . m i c r e l . c o m . features 28m? r dson 3a continuous operating current 1.2mm x 1.2mm space saving 4-pin mlf package 1.7v to 5.5v input voltage range internal level shift for cmos/ttl control logic ultra low quiescent current micro-power shutdown current soft-start: mic94042, mic94043 load discharge circuit: mic94041, mic94043 ultra fast turn off time junction operating temperature from -40? to +125? applications cellular phones portable navigation devices (pnd) personal media players (pmp) ultra mobile pcs portable instrumentation other portable applications pdas industrial and datacomm equipment ________________________________________________________________________________________________________ typical application MIC94040 (ultra fast turn on) mic94042 (soft-start) mic94041 (ultra fast turn on with auto-dsicharge) mic94043 (soft-start with auto-discharge)
micrel, inc. MIC94040/1/2/3 may 2008 2 m9999-053008-a ordering information part number part marking (1) fast turn on soft-start load discharge package (2) MIC94040yfl p4 4-pin (1.2mm x 1.2mm) mlf mic94041yfl p1 4-pin (1.2mm x 1.2mm) mlf mic94042yfl p2 4-pin (1.2mm x 1.2mm) mlf mic94043yfl p3 4-pin (1.2mm x 1.2mm) mlf notes: 1. mlf pin 1 identifier symbol is ? ? 2. mlf is a green rohs-compliant package. lead finish is nipdau. mold compound is halogen free. pin configuration top view 4-pin (1.2mm x1.2mm) mlf pin description pin number pin name pin function 1 v out drain of p-channel mosfet. 2 gnd ground should be connected to electrical ground. 3 v in source of p-channel mosfet. 4 en enable (input): active-high cmos/ttl control input for switch. internal ~2m w pull down resistor. output will be off if this pin is left floating. micrel, inc. MIC94040/1/2/3 may 2008 3 m9999-053008-a absolute maximum ratings (1) input voltage (v in ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6v enable voltage (v en ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6v continuous drain current (i d ) (3) t a = 25 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ?a t a = 85 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ?a pulsed drain current (i dp ) (4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ?.0a continuous diode current (i s ) (5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ?0ma storage temperature (t s ) . . . . . . . . . . . . . . . . . . . . . . . . . ?5? to +150? esd rating ?hbm (6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kv operating ratings (2) input voltage (v in ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +1.7 to +5.5v junction temperature (t j ) . . . . . . . . . . . . . . . . . . . . . . . ?0? to +125? package thermal resistance mlf ( q jc ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90?/w electrical characteristics t a = 25?, bold values indicate ?0?< t a < +85?, unless noted. symbol parameter condition min typ max units v en_th enable threshold voltage v in = 1.7v to 4.5v, i d = ?50a 0.4 1.2 v v in = v en = 5.5v, i d = open measured on v in MIC94040, mic94041 0.1 1 i q quiescent current v in = v en = 5.5v, i d = open measured on v in mic94042, mic94043 7 10 a i en enable input current v in = v en = 5.5v, i d = open 2.5 4 a i shut-q quiescent current (shutdown) v in = +5.5v, v en = 0v, i d = open measured on v in 0.1 1 a i shut-switch off state leakage current v in = +5.5v, v en = 0v, i d = short measured on v out , (7) 0.1 1 a v in = +5.0v, i d = ?00ma, v en = 1.5v 28 55 m? v in = +4.5v, i d = ?00ma, v en = 1.5v 30 60 m? v in = +3.6v, i d = ?00ma, v en = 1.5v 33 65 m? v in = +2.5v, i d = ?00ma, v en = 1.5v 45 90 m? v in = +1.8v, i d = ?00ma, v en = 1.5v 72 145 m? r ds(on) p-channel drain to source on resistance v in = +1.7v, i d = ?00ma, v en = 1.5v 82 160 m? r shutdown turn-off resistance (mic94041, mic94043) v in = +3.6v, i test = 1ma, v en = 0v 250 400 ? notes : 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. with thermal contact to pcb. see thermal considerations section. 4. pulse width <300s with < 2% duty cycle. 5. continuous body diode current conduction (reverse conduction, i.e. v out to v in ) is not recommended. 6. devices are esd sensitive. handling precautions recommended. hbm (human body model), 1.5k? in series with 100pf. 7. measured on the MIC94040yfl and mic94042yfl. micrel, inc. MIC94040/1/2/3 may 2008 4 m9999-053008-a electrical characteristics (dynamic) t a = 25?, bold values indicate ?0?< t a < +85?, unless noted. symbol parameter condition min typ max units v in = +3.6v, i d = ?00ma, v en = 1.5v MIC94040, mic94041 0.97 1.5 s t on_dly turn-on delay time v in = +3.6v, i d = ?00ma, v en = 1.5v mic94042, mic94043 50 106 185 s v in = +3.6v, i d = ?00ma, v en = 1.5v MIC94040, mic94041 0.5 0.9 5 s t on_rise turn-on rise time v in = +3.6v, i d = ?00ma, v en = 1.5v mic94042, mic94043 50 116 200 s t off_dly turn-off delay time v in = +3.6v, i d = ?00ma, v en = 0v 100 200 ns t off_fall turn-off fall time v in = +3.6v, i d = ?00ma, v en = 0v 20 100 ns micrel, inc. MIC94040/1/2/3 may 2008 5 m9999-053008-a typical characteristics MIC94040/1/2/3 MIC94040/1/2/3 MIC94040/1/2/3 MIC94040/1 mic94042/3 MIC94040/41 mic94042/3 mic94042/3 MIC94040/1 micrel, inc. MIC94040/1/2/3 may 2008 6 m9999-053008-a typical characteristics mic94042/3 MIC94040/1 mic94042/3 MIC94040/1 mic94042/3 MIC94040/1/2/3 mic94042/3 micrel, inc. MIC94040/1/2/3 may 2008 7 m9999-053008-a functional characteristics MIC94040 micrel, inc. MIC94040/1/2/3 may 2008 8 m9999-053008-a mic94041 micrel, inc. MIC94040/1/2/3 may 2008 9 m9999-053008-a mic94042 micrel, inc. MIC94040/1/2/3 may 2008 10 m9999-053008-a mic94043 micrel, inc. MIC94040/1/2/3 may 2008 11 m9999-053008-a application information power dissipation considerations as with all power switches, the current rating of the switch is limited mostly by the thermal properties of the package and the pcb it is mounted on. there is a simple ohms law type relationship between thermal resistance, power dissipation and temperature, which are analogous to an electrical circuit: figure 1. simple electrical circuit from this simple circuit we can calculate vx if we know isource, vz and the resistor values, rxy and ryz using the equation: ( ) vz ryz rxy isource vx + + ? = thermal circuits can be considered using these same rules and can be drawn similarly by replacing current sources with power dissipation (in watts), resistance with thermal resistance (in o c/w) and voltage sources with temperature (in o c). figure 2. simple thermal circuit now replacing the variables in the equation for vx, we can find the junction temperature (t j ) from power dissipation, ambient temperature and the known thermal resistance of the pcb (r q ca ) and the package (r q jc ). t j = p diss x (r q jc + r q ca ) + t a p diss is calculated as i switch 2 x r swmax . r q jc is found in the operating ratings section of the datasheet and r q ca (the pcb thermal resistance) values for various pcb copper areas is discussed in the document ?esigning with low dropout voltage regulators? available from the micrel website (ldo application hints). example: a switch is intended to drive a 2a load and is placed on a printed circuit board which has a ground plane area of at least 25mm by 25mm (625mm 2 ). the voltage source is a li-ion battery with a lower operating threshold of 3v and the ambient temperature of the assembly can be up to 50 o c. summary of variables: i sw = 2a v in = 3v to 4.2v t a = 50 o c r q jc = 90 o c/w from datasheet r q ca = 53 o c/w read from graph in figure 3 figure 3. excerpt from the ldo book p diss = i sw 2 x r swmax the worst case switch resistance ( r swmax ) at the lowest v in of 3v is not available in the datasheet, so the next lower value of v in is used. r swmax @ 2.5v = 90m w if this were a figure for worst case r swmax for 25 o c, an additional consideration is to allow for the maximum junction temperature of 125 o c, the actual worst case resistance in this case can be 30% higher (see r dson variance vs. temperature graph). however, 90m? is the maximum over temperature. therefore: t j = 2 2 x 0.090 x (90+53) + 50 t j = 101 o c this is below the maximum 125 o c. micrel, inc. MIC94040/1/2/3 may 2008 12 m9999-053008-a package information 4-pin (1.2mm x 1.2mm) mlf micrel, inc. MIC94040/1/2/3 may 2008 13 m9999-053008-a suggested landing pattern for 4 pin (1.2mm x 1.2mm) mlf micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944-0800 fax +1 (408) 474-1000 web http://www.micrel.com the information furnished by micrel in this data sheet is believed to be accurate and reliable. however, no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. a purchaser? use or sale of micrel products for use in life support appliances, devices or systems is a purchaser? own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ?2008 micrel, incorporated. |
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