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mp5092 dual 5.5v, 7.5a programmable current low r dson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 1 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. the future of analog ic technology description the mp5092 integrated a dual load switches to provide load protection covering 0.5v to 5.5v voltage range. any one channel can work alone. each channel can provide 7.5a load capability. with the small r dson in tiny package, mp5092 provides very high efficient and space saving solution in notebook and tablet or other portable devices applications. with the soft start function, the mp5092 can avoid inrush current during circuit start up. mp5092 also provides different functions, like programmable soft start time, output discharge functions, ocp and thermal shutdown features. the max load at the output (source) is current limited. this is accomplished by utilizing a sense fet topology. the magnitude of the current limit is controlled by an external resistor from ilim pin to ground. tiny 18 pins qfn 2mmx3mm of mp5092 is available in space saving package. features ? integrated 10m ? low rdson fets ? adjustable start up slew rate ? wide vin range from 0.5v to 5.5v ? <1ua shutdown current ? programmable 7.5a current limit range ? output discharge function ? enable pin ? <200ns short-circuitry response protection ? thermal protection ? small qfn-18 (2mmx3mm) package for space saving applications ? notebook and tablet computers ? portable devices ? solid state drivers ? handheld devices all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under products, quality assurance page. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 2 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. ordering information part number* package top marking mp5092gd qfn-18 (2mmx3mm) see below * for tape & reel, add suffix ?z (e.g. mp5092gd?z); top marking akf: product code of mp5092gd; y: year code; lll: lot number; package reference top view qfn-18 (2mmx3mm)
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 3 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. absolute maximum ratings (1) v in1/2 .......................................... ?0.3v to +6.5v v cc1/2 ......................................... ?0.3v to +6.5v v out1/2 ........................................ ?0.3v to +6.5v all other pins ....................... ?0.3v to vcc+0.3 v junction temper ature .............................. 150c lead temperat ure ................................... 260c continuous power dissipation (2) qfn18 (2mmx3mm) .................................. 1.8w recommended operating conditions (3) supply voltage v in1/2 ...................... 0.5v to 5.5v supply voltage v cc1/2 ........................ 3v to 5.5v output voltage v out1/2 .................... 0.5v to 5.5v operating junction temp. (t j ). -40c to +125c thermal resistance (4) ja jc qfn-18 (2mmx3mm) ??....?70 15 c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction-to- ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation a t any ambient temperature is calculated by p d (max) = (t j (max)-t a )/ ja . exceeding the maximum allowable powe r dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanen t damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb.
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 4 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. electrical characteristics v in = 3.6v, v cc = 3.6v, t a = 25c, unless otherwise noted. parameters symbol condition min typ max units input and supply voltage range input voltage v in 0.5 5.5 v supply voltage v cc 3 5.5 v supply current (single channel) off state leakage current i off v in =5v, en=0 1 a v cc standby current i stby v cc =5v, en=0 0.1 1 a v cc =5v, enable, no load 220 330 power fet on resistance r dson v cc =5.0v 10 m ? v cc =3.3v 12 thermal shutdown and recovery shutdown temperature (5) t std 155 c hysteresis (5) t hys 30 c under/over voltage protection (single channel) v cc under voltage lockout threshold v cc_uvlo uvlo rising threshold 2.6 2.8 v uvlo hysteresis v uvlohys 200 mv soft start ss pull-up current i ss fixed slew rate 9 a enable en rising threshold v enh 1.3 1.5 1.7 v en hysteresis v enhys 400 mv ilim current limit (5) i out r lim =10.5k ? , rise io, record its peak value 7.5 a current limit accuracy (6) r lim =50k ? 1.54 1.64 1.74 a discharge resistance (single channel) resistance r dis 200 ? notes: 5) guarantee by characterization -not production tested. 6) if sense current is smaller than 1.5a, the accuracy will be affected by some internal offset.
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 5 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performance characteristics v in = 3.6v, v cc = 3.6v, r lim =10.5k, t a = 25c, unless otherwise noted. 0 50 100 150 200 250 300 0 50 100 150 200 250 300 -50 0 50 100 150 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 23456 0.2 0.25 0.3 0.35 0.4 0.45 0.5 -50 0 50 100 150 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 -50 0 50 100 150 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 -50 0 50 100 150 0 2 4 6 8 10 12 14 0 2 4 6 8 10 12 14 16 -50 0 50 100 150 0 10 20 30 40 50 60 2.5 3 3.5 4 4.5 5 5.5 6 6.5 2.5 3 3.5 4 4.5 5 5.5 6 6.5 0123456789
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 6 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performance characteristics (continued) v in = 3.6v, v cc = 3.6v, r lim =10.5k, t a = 25c, unless otherwise noted. 0 1 2 3 4 5 6 7 8 -40 -20 0 20 40 60 80 100 1 10 100 1000 10000 100000 1 10 100 1000 0 5 10 15 20 25 30 35 40 0123456789
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 7 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performance characteristics (continued) v in = 3.6v, v cc = 3.6v, r lim =10.5k, t a = 25c, unless otherwise noted. v out 1v/div. enable startup v in =1.8v, v cc =3.6v, no load enable startup v in =1.8v, v cc =3.6v, 7a load enable shutdown v in =1.8v, v cc =3.6v,no load enable shutdown v in =1.8v, v cc =3.6v, 7a load enable startup v in =1.1v, v cc =3.6v, no load v out 2v/div. v en 5v/div. i lim 500mv/div. i out 5a/div. v out 2v/div. v en 5v/div. i lim 500mv/div. i out 5a/div. v out 2v/div. v en 5v/div. i lim 500mv/div. i out 5a/div. enable startup v in =3.6v, v cc =3.6v, no load enable shutdown v in =3.6v, v cc =3.6v, no load enable startup v in =3.6v, v cc =3.6v, 7a load v out 2v/div. v en 5v/div. v en 5v/div. i lim 500mv/div. i out 5a/div. i lim 500mv/div. i out 5a/div. v out 1v/div. v en 5v/div. i lim 500mv/div. i out 5a/div. v out 1v/div. v en 5v/div. i lim 500mv/div. i out 5a/div. v out 1v/div. v en 5v/div. i lim 500mv/div. i out 5a/div. v out 1v/div. v en 5v/div. i lim 500mv/div. i out 5a/div. enable shutdown v in =3.6v, v cc =3.6v, 7a load
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 8 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performance characteristics (continued) v in = 3.6v, v cc = 3.6v, r lim =10.5k, t a = 25c, unless otherwise noted. enable startup v in =1.1v, v cc =3.6v, 7a load enable shutdown v in =1.1v, v cc =3.6v, no load enable shutdown v in =1.1v, v cc =3.6v, 7a load v out 2v/div. v in 2v/div. i lim 500mv/div. i out 5a/div. v out 1v/div. v en 5v/div. i lim 500mv/div. i out 5a/div. v out 1v/div. v en 5v/div. i lim 500mv/div. i out 5a/div. v out 1v/div. v en 5v/div. i lim 500mv/div. i out 5a/div. v out 2v/div. v in 2v/div. i lim 500mv/div. i out 5a/div. power up v in =3.6v, v cc =3.6v, no load power up v in =3.6v, v cc =3.6v, 7a load v out 2v/div. v in 2v/div. i lim 500mv/div. i out 5a/div. power down v in =3.6v, v cc =3.6v, no load v out 2v/div. v in 2v/div. i lim 500mv/div. i out 5a/div. v out 2v/div. v in 2v/div. i lim 500mv/div. i out 5a/div. power down v in =3.6v, v cc =3.6v, 7a load steady state v in =3.6v, v cc =3.6v, 7a load v out 2v/div. i out 5a/div. v in 5v/div. load transient response v in =5v, v cc =3.3v, i out =0a to 7a
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 9 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performance characteristics (continued) v in = 3.6v, v cc = 3.6v, r lim =10.5k, t a = 25c, unless otherwise noted. v out 2v/div. i out 5a/div. v in 5v/div. v out 2v/div. i out 5a/div. v in 5v/div. v out 2v/div. i out 5a/div. v in 5v/div. scp steady state v in =5v, v cc =3.3v, r lim =10.5k scp recovery v in =5v, v cc =3.3v, r lim =10.5k scp entery v in =5v, v cc =3.3v, r lim =10.5k
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 10 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. pin functions (2x3)qfn18 pin # name description 1, 13 vin1 input power supply of switch 1. 2, 12 vout1 output to the load of switch 1. 3, 11 vout2 output to the load of switch 2. 4, 10 vin2 input power supply of switch 2. 5 en2 enable input of switch 2. pulling this pin below the specified threshold shuts the chip down. 6, 15 gnd ground. 7 vcc2 switch 2?s supply voltage to the control circuitry. 8 ilim2 output current limit configure of switch 2. place a resistor to ground to set the overload current limit level. 9 ss2 soft start control pin of load switch 2. connecting a capacitor from this pin to ground to set the soft start time. 14 en1 enable input of switch 1. pulling this pin below the specified threshold shuts the chip down. 16 vcc1 switch 1?s supply voltage to the control circuitry. 17 ilim1 output current limit configure of switch 1. place a resistor to ground to set the overload current limit level. 18 ss1 soft start control pin of load switch 1. connecting a capacitor from this pin to ground to set the soft start time.
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 11 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. block diagram charge pump current sense 1v vin1 ilim1 vout1 ss1 control logic uvlo en1 4 8 80 vcc gnd fast off comp current limit amp soft start thermal sense 4 vcc vcc1 figure 1: functional block diagram (only channel 1 included, channel 2 is the same)
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 12 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. operation the mp5092 is designed to limit the in-rush current to the load when a circuit card is inserted into a live backplane power source; thereby limiting the backplane?s voltage drop and the slew rate of the voltage to the load. mp5092 integrated two independent load switches. any one channel can work alone. each channel can provide 7.5a load capability. it provides an integrated solution to monitor output current to eliminate the need for an external current power mosfet, and current sense device. enable when input voltage is greater than the under- voltage lockout threshold (uvlo), typically 0.5v, mp5092 can be enabled by pulling en pin to higher than 1.5v. pulling down to ground will disable mp5092. the recommend start up sequence is power up v in first. after v in is ready, pull en voltage to high. current limit the mp5092 provides a constant current limit that can be programmed by an external resistor. once the device reaches its current limit threshold, the internal circuit regulates the gate voltage to hold the current in the power fet constant. the typical response time is about 20s and the output current may have a small overshoot during this time period. the pre-set current limit value can be calculated by below equation: ) ( 82000 ) ( = lim lim r a i (1) r lim is r1 and r2 which are placed between ilim1/2 pin to ground in figure 4. if the current limit block starts to regulate the output current, the power loss on power mosfet will cause the ic temperature rise. if the junction temperature rose to high enough, it will trigger thermal shutdown. after thermal shutdown happened, it will disable the output until the over temperature fault remove. the over temperature threshold is 155 o c and hysteresis is 30 o c. bias vcc supply vcc is the bias supply for internal analog circuit. it is better to have a decouple capacitor to filter the noise. if the main power voltage v in is higher than 3v, the vcc can be directly connected to v in . short-circuit protection if the load current increases rapidly due to a short circuit, the current may exceed the current limit threshold by a lot before the control loop can respond. if the current reaches an internal secondary current limit level (about 13a), a fast turn-off circuit activates to turn off the power fet. this limits the peak current through the switch to limit the input voltage drop. the total short circuit response time is about 200ns. if fast off works, it will keep off the power fet for 80us. after that time period, it will re-turn on power fet.. output discharge mp5092 has output discharge function. this function can discharge the vo by internal pull down resistance when ic disabled and the load is very light. soft-start a capacitor connected to the ss pin determines the soft-start time. there is an internal 9ua constant current source charge ss cap and ramps up the voltage on the ss pin. the output voltage rises at 3 times the slew rate to the ss voltage. the soft-start time can be calculated by below equation: ) ( ) ( ) ( 3 1 ) ( ua i nf c v v ms t ss ss out ss ? = (2) t ss is the soft-start time, i ss is internal 9ua constant current, c ss is external soft-start cap. the suggestion minimum ss cap should be bigger than 4.7nf. if the ss pin is floated or ss cap is too small, the vo rising time will be just limited by power mos charge time.
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 13 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. application information ilim resistor selection the current limit value can be set by ilim resistor. the current limit can be gotten by equation (1). the current limit threshold is suggested to 10% ~ 20% higher than maximum load current. for example, if the system?s full load is 7a, set the current limit to 7.7a. ilim capacitor selection the internal advanced auto-zero comparator bring a high accuracy of current limit. the auto- zero will also cause some little jitter on ilim pin. to get a more stable ilim, a small ceramic capacitor can be mounted between ilim and ground. suggested place a ilim capacitor less than 1nf. soft start capacitor selection there is an internal 9ua constant current source charge ss cap and ramps up the voltage on the ss pin. the output voltage rises follow 3 times the slew rate of ss voltage. if the inrush on output current reached the current limit during start up (like with large output cap or very large load), mp5092 will limit the output current and the same time, ss time will be increased (figure 2). soft start @ different output capacitance v out soft start @ small capacitance soft start @ large capacitance i in v out i in v out i in soft start @ very large capacitance current limit current limit current limit figure 2: soft start periods at different output capacitance
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function mp5092 rev. 1.0 www.monolithicpower.com 14 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. design example some design examples are provided below. see table 1 and figure 3. table 1 v in (v) current limit (a) r lim (k ? ) ss cap (nf) ss time (ms) 5 3 26.1 22 4 5 5 15.8 47 9 5 7.5 10.5 100 20 figure 3: typical application schematic layout guide pcb layout is very important to achieve stable operation. please follow these guidelines and take below figure for reference (take schematic in figure 3 as an example). place ilim resistor (r1 and r2 in figure 3) close to ilim1/2 pin, input cap close to v cc pin. put enough vias around ic to achieve better thermal performance. figure 4: recommended layout
mp5092 ? dual 5.5v, 7.5a low rdson load switch with output discharge function notice: the information in this document is subject to change without notice. please contact mps for current specifications. users should warrant and guarantee that third party intellectual property rights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp5092 rev. 1.0 www.monolithicpower.com 15 1/8/2015 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. package information qfn18 (2mmx3mm) side view bottom view note: 1) all dimensions are in millimeters. 2) exposed paddle size does not include mold flash. 3) lead coplanarity shall be 0.10 millimeters max. 4) jedec reference is mo-220. 5) drawing is not to scale. pin 1 id marking top view pin 1 id index area recommended land pattern pin 1 id 0.15x0.10 typ 0.15x0.10

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