EV2312-Q-00A 24v, high current synchronous step-down converter evaluation board EV2312-Q-00A rev.1.0 www.monolithicpower.com 1 4/25/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. the future of analog ic technology description the EV2312-Q-00A is an evaluation board for the mp2312, a high efficiency monolithic synchronous step-down converter. the evaluation board can deliver 2.1a continuous load current from a 6v to 24v input with excellent load and line regulation. constant-on-time (cot) control mode provides fast transient response and eases loop stabilization. the evaluation board can be turned on or shut down via a remote on/off input that is reference to ground. this input is compatible with popular logic devices. electrical specification paramete r symbol v alue units input voltage v in 6 ? 24 v output voltage v out 5 v output current i out 2.1 a switching frequency f sw 500 khz features ? wide 6v to 24v operating input range ? 2.1a continuous output current ? low r ds (on) internal power mosfets ? proprietary switching loss reduction technique ? 1% reference voltage ? internal soft start ? output discharge ? 500khz switching frequency ? ocp, ovp, uvp protection and thermal shutdown ? available in a qfn3x3 package applications ? laptop computer ? tablet pc ? networking systems ? personal video recorders ? flat panel television and monitors ? distributed power systems a ll 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. EV2312-Q-00A evaluation board (l w h) 8.55cm 8.55cm 1.6cm board numbe r mps ic numbe r EV2312-Q-00A mp2312gq 50 60 70 80 90 100 0.01 0.1 1 10
EV2312-Q-00A ?24v, high current synchronous step-down converter EV2312-Q-00A rev.1.0 www.monolithicpower.com 2 4/25/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evaluation board schematic ns c6 22 f c1b ns c1a 220nf c3 4.7 r3 1 f c5 100k r8 gnd ns c2a 22 f c2d 22 f c2e vin gnd1 ns d1 ns r6 gnd gnd 100nf c2f vout v out 100nf c7 vout gnd en gnd3 vcc gnd_out v cc vcc gnd en en voutsense gnd sw sw agnd agnd 390pf c4 fb fb 100nf c1c sw vout 100nf c2b pg pg pg vin bst vinsense gnd gnd vin cn_out gnd vout ns r10 lp# 10 h l1 2m r4 499 r9 ns c2c 20.5k r2 160k r1 499k r5 mp2312 vin 1 pgn d 2 pg 4 vout 7 sw sw bst 10 vcc 11 fb 12 en 13 agnd 14 8,9 nc 3
EV2312-Q-00A ?24v, high current synchronous step-down converter EV2312-Q-00A rev.1.0 www.monolithicpower.com 3 4/25/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. EV2312-Q-00A bill of materials qty. ref value description package manufacture manufacture_pn 1 c1b 22 f ceramic capacitor;25v;x5r;1210 1210 murata grm32er61e226ke15l 2 c1c,c2b 100nf ceramic capacitor;50v;x7r;0603 0603 murata grm188r71h104ka93d 0 c1a,c2a ,c2c,c6 ns 2 c2d, c2e 22 f ceramic capacitor;6.3v;x5r;1206 1206 murata grm31cr60j226ke19 2 c2f, c7 100nf ceramic capacitor;16v;x7r;0603 0603 murata grm188r71c104ka01d 1 c3 220nf ceramic capacitor;16v;x7r;0603 0603 murata grm188r71c224ka01 1 c4 390pf ceramic capacitor;50v;x7r;0603 0603 murata grm1885c1h391ja01 1 c5 1 f ceramic capacitor;10v;x5r;0603 0603 murata grm188r71a105ka61d 0 d1 ns schottky diode;40v;0.5a sod-123 1 l1 10 h inductor;10 h; 25m ? ,4a smd wurth 7447715100 1 r1 160k film resistor;1% 0603 yageo rc0603fr-07160kl 1 r2 20.5k film resistor;1% 0603 yageo rc0603fr-0720k5l 1 r3 4.7 film resistor;5% 0603 yageo rc0603jr-074r7l 1 r4 2m film resistor;1% 0603 yageo rc0603fr-072ml 0 r6 ns film resistor;1% 0603 1 r5 499k film resistor;1% 0603 yageo rc0603fr-07499kl 2 r8 100k film resistor;1% 0603 yageo rc0603fr-07100kl 1 r9 499 film resistor;1% 0603 yageo rc0603fr-07499rl 0 r10 ns film resistor;5% 0603 1 u1 step down converter qfn 33 mps mp2312gq
EV2312-Q-00A ?24v, high current synchronous step-down converter EV2312-Q-00A rev.1.0 www.monolithicpower.com 4 4/25/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results performance waveforms are tested on the EV2312-Q-00A. v in = 19v, v out = 5v, l = 10h, t a = 25c, unless otherwise noted. v out 2v/div. v pg 5v/div. v in 20v/div. v in 5v/div. v sw 10v/div. i l 500ma/div. v out 2v/div. v pg 5v/div. v in 10v/div. v sw 10v/div. i l 2a/div. v out 2v/div. v pg 5v/div. v en 5v/div. v sw 10v/div. i l 500ma/div. v out 2v/div. v pg 5v/div. v en 5v/div. v sw 20v/div. i l 1a/div. v out 2v/div. v pg 5v/div. v en 5v/div. v sw 10v/div. i l 2a/div. v out 2v/div. v pg 5v/div. v en 5v/div. v sw 10v/div. i l 2a/div. v out 2v/div. v pg 5v/div. v sw 5v/div. i l 1a/div. v in 20v/div. v out 2v/div. v pg 5v/div. v sw 10v/div. i l 2a/div. v sw 10v/div. v out /ac 20mv/div. v in /ac 100mv/div. i l 2a/div.
EV2312-Q-00A ?24v, high current synchronous step-down converter EV2312-Q-00A rev.1.0 www.monolithicpower.com 5 4/25/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the EV2312-Q-00A. v in =19v, v out =5v, l=10h, t j =+25c, unless otherwise noted. v out 2v/div. v pg 5v/div. v sw 20v/div. i l 1a/div. v out 2v/div. v pg 5v/div. v sw 10v/div. i l 1a/div. v out 20mv/div. i out 1a/div. v out 2v/div. v pg 5v/div. v sw 20v/div. i l 2a/div. v sw 5v/div. v out /ac 20mv/div. v in /ac 20mv/div. i l 500ma/div.
EV2312-Q-00A ?24v, high current synchronous step-down converter EV2312-Q-00A rev.1.0 www.monolithicpower.com 6 4/25/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. printed circuit board layout figure 1: top silk laye r figure 2: top laye r figure 3: inne r laye r 1 figure 4: inne r laye r 2 figure 5: bottom laye r
EV2312-Q-00A ?24v, high current synchronous step-down converter 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. EV2312-Q-00A rev.1.0 www.monolithicpower.com 7 4/25/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. quick start guide 1. connect the positive and negative terminals of the load to the vout and gnd pins respectively. 2. preset the output of power supply between 6v and 24v, and then turn off the power supply. 3. connect the positive and negative terminals of the power supply output to the vin and gnd pins respectively: 4. turn the power supply on. the mp2312gq will automatically start up. 5. to use the enable function, apply a digital input to the en pin. drive en higher than 2v to turn on the regulator or less than 0.4v to turn it off. 6. use r1 and r2 to set the output voltage within vfb=0.604v. follow the application information section in the device datasheet to select the proper value of r1, r2, inductor and output capacitor values when output voltage is changed.
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