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MIC94161/2/3/4/5 3a high - side load switch with reverse blocking micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com march 14, 2014 revision 1. 1 general description the MIC94161/2/3/4/5 is a family of high - side load switches designed to operate from 1.7v to 5.5v input voltage. the load switch pass element is an internal 14.5m? r dson n - channel mosfet which enables the device to support up to 3a of continuous current. additionally, the load switch supports 1.5v logic level control and shutdown features in a tiny 1.5mm 1mm 6 - ball wl csp package. the mic9416x provides reverse curre nt protection when the device is disabled. the device will not allow the flow of current from the output to the input when the device is turned off. additiona lly, the MIC94161 features over voltage protection to protect the load when the input voltage is ab ove 4.55v, as well as a precise enable threshold which keeps the MIC94161 in the default off state until the en pin rises above 1.15v. the MIC94161/2/3/4/5 operating voltage ran ge makes them ideal for lithium - ion and nimh/nicad/alkaline battery - powered sys tems, as well as non - battery - powered applications. the devices provide low quiescent current and low shutdown current to maximize battery life. datasheets and support documentation are available on micrel?s web site at : www.micrel.com . features ? 1.5mm 1mm 6 - ball wl csp package ? 14.5m? r dson ? 1.7v to 5.5v input voltage range ? 3a continuous operating current ? reverse current flow blocking (no ?body diode?) ? internal level shift for cmos/ttl control logic ? ultra - low quiescent current ? micropower shutdown current ? soft - start: MIC94161/4/5 (2.7ms) ? load discharge circuit: mic94162/4 ? ultra - fast turn - off time ? junction operating temperature from ? 40 c to +125 c applications ? solid state drives (ssd) ? smart phones and tablets ? personal media p layers (pmp) ? ultra m obile pcs ? portable instrumentation ? gps m odules ? d atacom equipment typical application MIC94161 (2.7ms soft start with ovp) mic94163 (ultra - fast turn on) mic94165 (2.7ms soft start) mic94162 (ultra - fast turn on with auto discharge) mic94164 (2.7ms soft start with auto discharge)
micrel, inc. MIC94161/2/3/4/5 march 14, 2014 2 revision 1. 1 ordering information part number marking ovp turn - on time active discharge package MIC94161ycs 1q yes 2.7ms no 1.5mm 1mm 6 - ball wlcsp mic94162ycs 2q no 60 s yes 1.5mm 1mm 6 - ball wlcsp mic94163ycs 3q no 60 s no 1.5mm 1mm 6 - ball wlcsp mic94164ycs 4q no 2.7ms yes 1.5mm 1mm 6 - ball wlcsp mic94165ycs zq no 2.7ms no 1.5mm 1mm 6 - ball wlcsp pin configuration 6 - ball 1.5mm 1mm w lcsp ( cs) (top view) pin description pin number pin name pin function a1, b1 vout source of n - channel mosfet. c1 gnd ground. a2, b2 vin input supply: drain of n - channel mosfet. c2 en enable (input): active - high control input for switch. internal 2m pull - down resistor. output will be off if this pin is left floating.
micrel, inc. MIC94161/2/3/4/5 march 14, 2014 3 revision 1. 1 absolute maximum ratings ( 1 ) input voltage (v in ) ........................................... ? 0.3v to +6v enable voltage (v en ) ...................................... ? 0.3v to +6v continuous drain current (i d ) (3) ..................................... 3a storage temperature (t s ) ......................... ? 55c to +150c esd rating ( 4) .................................................................. 2kv operating ratings ( 2 ) input voltage (v in ) ........................................... +1.7 to +5.5v junction temperature (t j ) ........................ ? 40c to +125c package thermal resistance 1 .5 mm 1mm 6 - ball wlcsp ( ja ) ................. 108 c/w electrical characteristics t a = 25c, bold values indicate ? 40c t j +125c , unless noted. parameter symbol condition min . typ . max . units general operating input voltage range v in 1.7 5.5 v enable threshold voltage (MIC94161) v enth v in = 1.7v to 5.5v , i out = 250a 1.15 1.5 v enable threshold voltage (mic 94162/3/4/ 5) v enth logic low, off; v in = 1.8v to 5.5v; i out = 250a; ? 40? c t j 85 ? c 0.375 v logic high, on; v in = 1.7v to 5.5v; i out = 250a; ? 40? c t j 125 ? c 1.2 enable input current i en v in = v en = 3.6v ; i out = 0 2 4 a quiescent current ( mic 94161) i q v in = v en = 3.6v ; i out = 0 40 80 a quiescent current (mic94162/ 3) i q v in = v en = 3.6v ; i out = 0 25 5 5 a quiescent current (mic94164/ 5) i q v in = v en = 3.6v ; i out = 0 15 3 5 a shutdown current i sd v in = 5.5v ; v en = 0v ; i out = open 0.1 1 a off state leakage current i leak v in = 5.5v ; v en = 0v ; i out = short 0.1 1 a reverse leakage current (MIC94161,3,5) i leakr v in = 0v ; v out = 5.5v ; v en = 0v 0.1 1 a n - channel on - resistance r ds(on) v in = 5.5v ; v en = 1.5v ; i out = 3a 14.5 m v in = 4.5v ; v en = 1.5v ; i out = 3a 15.5 v in = 3.6v ; v en = 1.5v ; i out = 3a 17.5 v in = 2.7v ; v en = 1.5v ; i out = 3a 21 v in = 1.8v ; v en = 1.5v ; i out = 3a 34 v in = 1.7v ; v en = 1.5v ; i out = 3a 40 overvoltage protection threshold (MIC94161) v ovp v in = v en ; i out = 0; v in rising 4.5 4.75 5 v active discharge resistance (mic94162/ 4) r ad v in = 3.6v ; i test = 1ma ; v en = 0v 200 400 notes: 1. exceeding the absolute maximum ratings may damage the device. 2. the device is not guaranteed to function outside its operating ratings. 3. with thermal contact to pcb (s ee application information ). 4. devices are esd sensitive. handling precautions are recommended. human body model, 1.5k ? in series with 100pf.
micrel, inc. MIC94161/2/3/4/5 march 14, 2014 4 revision 1. 1 electrical characteristics (continued) t a = 25c, bold values indicate ? 40c t j +125c , unless noted. parameter symbol condition min . typ . max . units timing characteristics turn - on delay time (mic94162/ 3) t on v in = 3.6v ; r load = 1.2 ; c out = 200f ; v en = 1.5v 10 s turn - on rise time (mic94162/ 3) t r v in = 3.6v ; r load = 1.2 ; c out = 200f ; v en = 1.5v 60 s turn - on delay time (MIC94161/4/ 5) t on v in = 3.6v ; r load = 1.2 ; c out = 200f ; v en = 1.5v 0.4 ms turn - on rise time (MIC94161/4/ 5) t r v in = 3.6v ; r load = 1.2 ; c out = 200f ; v en = 1.5v 2.7 ms turn - off delay time t off v in = 3.6v ; r load = 1.2 ; c out = 200f ; v en = 1.5v 25 s turn - off fall time t f v in = 3.6v ; r load = 1.2 ; c out = 200f ; v en = 1.5v 500 s
micrel, inc. MIC94161/2/3/4/5 march 14, 2014 5 revision 1. 1 timing diagrams figure 1 . output voltage rise and fall time m easurements figure 2 . output voltage turn on and turn off measurements
micrel, inc. MIC94161/2/3/4/5 march 14, 2014 6 revision 1. 1 typical characteristics 0 5 10 15 20 25 30 35 -40 -20 0 20 40 60 80 100 120 on resistance (m ? ) temperature ( c) on resistance vs. temperature v in = 2.7v v in = 1.7v v in = 3.6v v in = 5.5v i out = 3a 0 10 20 30 40 50 60 70 80 90 1 10 100 1000 10000 voltage drop (mv) output current (ma) voltage drop vs. output current v in = 5.5v v in = 3.6v v in = 1.7v 5 10 15 20 25 30 35 40 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 rdson (m ? ) input voltage (v) rdson vs. input voltage t = 25 c 400 450 500 550 600 650 700 750 800 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 enable threshold (mv) input voltage (v) enable threshold vs. input voltage (mic94162/3/4/5) t = 25 c 500 550 600 650 700 750 800 -40 -20 0 20 40 60 80 100 120 enable (mv) temperature ( c) enable threshold vs. temperature (mic94162/3/4/5) v in = 3.6v 1.27 1.28 1.29 1.3 1.31 1.32 1.33 1.34 1.35 1.5 2 2.5 3 3.5 4 4.5 5 enable threshold (v) input voltage (v) enable threshold vs. input voltage (MIC94161) 0 10 20 30 40 50 60 1.5 2 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) quiescent current (a) quiescent current vs. input voltage (MIC94161) v en = 1.5v 0 10 20 30 40 50 60 70 80 1.5 2 2.5 3 3.5 4 4.5 5 5.5 iq (a) input voltage (v) quiescent vs. input voltage (mic94162/3) v en = 1.5v 0 5 10 15 20 25 30 35 40 45 1.5 2 2.5 3 3.5 4 4.5 5 5.5 iq (a) input voltage (v) quiescent vs. input voltage (mic94164/5) v en = 1.5v
micrel, inc. MIC94161/2/3/4/5 march 14, 2014 7 revision 1. 1 typical characteristics (continued) 0 10 20 30 40 50 60 70 80 90 -40 -20 0 20 40 60 80 100 120 quiescent current (a) temperature ( c) quiescent current vs. temperature (MIC94161) v in = 3.6v 0 10 20 30 40 50 60 -40 -20 0 20 40 60 80 100 120 quiescent current (a) temperature ( c) quiescent current vs. temperature (mic94162/3) v in = 3.6v 0 5 10 15 20 25 30 35 40 -40 -20 0 20 40 60 80 100 120 quiescent current (a) temperature ( c) quiescent current vs. temperature (mic94164/5) v in = 3.6v 4.63 4.64 4.65 4.66 4.67 4.68 4.69 4.7 -40 -20 0 20 40 60 80 100 120 ovp threshold (v) temperature ( c) ovp threshold vs. temperature (MIC94161) i out = 100ma 0 5 10 15 20 25 30 35 40 45 1.5 2 2.5 3 3.5 4 4.5 5 5.5 ton delay (s) input voltage (v) ton delay vs. input voltage (mic94162/3) i out = 100ma c out = 10f 0 50 100 150 200 250 1.5 2 2.5 3 3.5 4 4.5 5 5.5 rise time (s) input voltage (v) rise time vs. input voltage (mic94162/3) i out = 100ma c out = 10f 0 200 400 600 800 1000 1200 1400 1600 1800 2000 1.5 2 2.5 3 3.5 4 4.5 5 5.5 ton delay (s) input voltage (v) ton delay vs. input voltage (MIC94161/4/5) i out = 100ma c out = 10f
micrel, inc. MIC94161/2/3/4/5 march 14, 2014 8 revision 1. 1 functional characteristics
micrel, inc. MIC94161/2/3/4/5 march 14, 2014 9 revision 1. 1 application information the MIC94161/2/3/4/5 is a family of high - side load switches designed to operate from 1.7v to 5.5v input voltage. the load switch pass element is an internal 14.5m? r dson n - channel mosfet which enables the device to support up to 3a of continuous current. additionally, the load switch supports 1.5v logic level control and shutd own features in a tiny 1.5mm 1mm 6 - ball wl csp package. the mic9416x provides reverse current protection when the device is disabled. the device will not allow the flow of current from the output to the input when the device is turned off. additiona lly, the MIC94161 features over voltage protection to protect the load when the input voltage is above 4.55v, as well as a precise enable threshold which keeps the MIC94161 in the default off state until the en pin rises above 1.15v. the mic94162/3 features rapi d turn on for applications that require quick startup time. the MIC94161/4/5 provides a slew rate controlled soft - start turn - on of 2.7ms. the soft - start feature is provided to prevent an in - rush current event from pulling down the input supply voltage. the mic94162/4 feature an active load discharge circuit which switches in a 200? load when the switch is disabled to automatically discharge a capacitive load. an active pull - down on the enable input keeps the MIC94161/2/3/4/5 in a default off state until the enable pin is pulled above 1.2v. internal level shift circuitry allows low voltage logic signals to switch higher supply voltages. the enable voltage can be as high as 5.5v and is not limited by the input voltage. power switch soa the safe operating area (soa) curve represents the boundary of maximum safe operating current and maximum safe operating junction temperature. figure 3 illustrates the soa for various input voltages, with the package mounted on a typical 1 layer, 1 square inch copper board. figure 3 . safe operating area (soa) gra ph 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 resistan ce, power dissipation and temperature, which are analogous to an electrical circuit: figure 4 . simple electrical circuit from this simple circuit we can calculate v x if we know i source , v z and the resistor values, r xy and r yz using e quation 1 : v x = i source (r xy + r yz ) + v z eq. 1 thermal circuits can be considered using these same rules and can be drawn similarly by replacing current sources wit h power dissipation (in w atts), resistan ce with thermal resistance (in c/w) and voltag e sources with temperature (in c). 0 0.5 1 1.5 2 2.5 3 3.5 -60 -40 -20 0 20 40 60 80 100 120 140 maximum switch current (a) ambient temperature ( c) maximum current vs. ambient temperature (1" square copper) vin = 5v vin = 4v5 vin = 3v6 vin=2v5
micrel, inc. MIC94161/2/3/4/5 march 14, 2014 10 revision 1. 1 figure 5 . simple thermal circuit now replacing the variables in the equation for v x , one can find the junction temperature (t j ) from power dissipation, ambient temperature and the known thermal resistance of the pcb (r ca ) and the package (r jc ). p diss is calculated as i sw 2 r sw(max) . r jc is found in the operating ratings section of the datasheet and r ca (the pcb thermal resistance) values for various pcb copper area s is discussed in the document designing with low dropout voltage regulators available from the micrel website . example : a switch is intended to drive a 3a lo ad and is placed on a printed circuit board which has a ground plane area of at least 25mm 25mm (625mm 2 ). the v oltage source is a li - ion battery with a lower operating threshold of 3v and the ambient temperature of the assembly can be up to 8 0 c. summary of variables: ? i sw = 3a ? v in = 3v to 4.2v ? t a = 80 c ? r ja = 108 c/w ? p diss = i sw 2 x r sw the worst case switch resistance (r sw ) at the lowest v in of 3v is not available in the datasheet, so the next lower value of v in is used, as shown in equation 2 r sw @ 2.7v = 21m eq. 2 if this were a figure for worst case r sw for 25 c, an additional consideration is to allow for the maximum junction temperature of 125 c, in this cas e can be 30% higher (s ee the ? on resistance vs. t emperature ? graph in the typical characteristics section ): r sw(max) = 27m eq. 3 therefore: t rise = (3a 2 27m? ) 108 c/w = 26.2 c t j = t rise + t a = 26.2 c + 80 c = 106.2 c this is below the maximum 125 c.
micrel, inc. MIC94161/2/3/4/5 march 14, 2014 11 revision 1. 1 package information ( 5 ) and recommended landing pattern 1.5mm 1 mm 6 - ball wlcsp note: 5. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com .
micrel, inc. MIC94161/2/3/4/5 march 14, 2014 12 revision 1. 1 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 micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in th is data sheet. this information is not intended as a warranty and micre l does not assume responsibility for its use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, micrel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel produ cts including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right . micrel products are not designed or authorized for use as components in lif e 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?s use or sale of micrel products for use in life support appliances, devices or systems is a purchaser?s own risk a nd purcha ser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 20 13 micrel, incorporated.

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