ev9943-q-00a high-efficiency, 3a peak, 36v, 410khz step-down converter with power good evaluation board ev9943-q-00a rev.1.0 www.monolithicpower.com 1 9/17/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. the future of analog ic technology description the ev9943-q-00a demonstrates mps?s mp9943, a high-frequency, synchronous, rectified, step-down converter with built-in high- side and low-side power mosfets. the mp9943 offers a very compact solution to achieve a 3a peak output current with excellent load and line regulation over a wide input supply range. the mp9943 has synchronous mode operation for higher efficiency over the output current load range. current-mode operation provides fast transient response and eases loop stabilization. full protection features includes over-current protection and thermal shutdown. the mp9943 requires a minimal number of readily-available s is available in a space- saving qfn8 (3mm x 3mm) package. electrical specification (1) parameter symbol value continuous 12v typical input voltage transient v in 36v max output voltage v out 5v output current i out 3a peak notes: 1) for different input/output voltage specs and different output capacitor/inductor may need chan ge the application circuit parameters. features ? wide 4v to 30v continuous operating input range ? 36v input transient tolerance ? 85m ? /55m ? low r ds(on) internal power mosfets ? high-efficiency synchronous mode operation ? 410khz switching frequency ? synchronizes from 200khz-to-2.2mhz external clock ? high duty cycle for automotive cold-crank ? internal power-save mode ? internal soft-start ? power good indicator ? over current protection and hiccup ? thermal shutdown ? output adjustable from 0.8v ? available in an qfn8 (3mm x 3mm) package applications ? general consumer ? multi-function printers (mfp) ? distributed power systems 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. ev9943-q-00a evaluation board board number mps ic number ev9943-q-00a MP9943GQ
ev9943-q-00a ? 36v, 410khz, 3a peak, step-down converter ev9943-q-00a rev.1.0 www.monolithicpower.com 2 9/17/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evaluation board schematic
ev9943-q-00a ? 36v, 410khz, 3a peak, step-down converter ev9943-q-00a rev.1.0 www.monolithicpower.com 3 9/17/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. ev9943-q-00a bill of materials qty ref value description package manufacturer manufacturer p/n 2 c1a,c1b 10 f ceramic cap., 50v, x7r 1210 murata grm32er71h106ka12l 1 c1c 0.1 f ceramic cap., 50v, x7r 0603 murata grm188r71h104ka93d 2 c2a,c2b 22 f ceramic cap., 16v, x7r 1210 murata grm32er71c226ke79 3 c2, c2c, c3 0.1 f ceramic cap., 16v, x7r 0603 murata grm188r71c104ka01d 1 c4 33pf ceramic cap., 50v, c0g 0603 murata grm1885c1h330ja01d 2 c1d, c1e ns 1 d1 ns 1 l1 10 h inductor, 33m ? dcr, 4a smd wurth 744314101 1 r1 1m film res., 5% 0603 yageo rc0603jr-071ml 1 r3 100k film res., 1% 0603 yageo rc0603fr-07100kl 1 r4 20 film res., 1% 0603 yageo rc0603fr-0720rl 1 r5 51k film res., 1% 0603 yageo rc0603fr-0751kl 1 r6 0 film res., 5% 0603 yageo rc0603fr-070rl 1 r7 41.2k film res., 1% 0603 yageo rc0603fr-0741k2l 1 r8 7.68k film res., 1% 0603 yageo rc0603fr-077k68l 1 r9 10 film res., 1% 0603 yageo rc0603fr-0710rl 1 r2 ns 1 u1 step-down regulator qfn8(3m mx3mm) mps MP9943GQ
ev9943-q-00a ? 36v, 410khz, 3a peak, step-down converter ev9943-q-00a rev.1.0 www.monolithicpower.com 4 9/17/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results performance waveforms are tested on the evaluation board. v in = 12v, v out = 5v, l = 10h, t a = 25c, unless otherwise noted. v sw 10v/div. v out ac coupled 10mv/div. v in ac coupled 10mv/div. i l 500ma/div. v sw 10v/div. v out ac coupled 10mv/div. v in ac coupled 10mv/div. i l 500ma/div. v sw 10v/div. v out ac coupled 20mv/div. v in ac coupled 200mv/div. i l 2a/div. steady state i out = 0a steady state i out = 0a steady state i out = 3a v out 2v/div. v pg 5v/div. v sw 10v/div. i l 1a/div. v out 2v/div. v pg 5v/div. v sw 5v/div. i l 5a/div. v out 2v/div. v pg 5v/div. v sw 5v/div. i l 5a/div. v out 2v/div. v pg 5v/div. v sw 5v/div. i l 5a/div. v out 2v/div. v en 5v/div. v sw 10v/div. i l 1a/div. v out 2v/div. v en 5v/div. v sw 10v/div. i l 5a/div. startup through vin i out = 0a startup through vin i out = 3a startup through en i out = 0a startup through en i out = 3a shutdown through vin i out = 0a shutdown through vin i out = 3a
ev9943-q-00a ? 36v, 410khz, 3a peak, step-down converter ev9943-q-00a rev.1.0 www.monolithicpower.com 5 9/17/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the evaluation board. v in = 12v, v out = 5v, l = 10h, t a = 25c, unless otherwise noted. v out 2v/div. v en 5v/div. v sw 10v/div. i l 1a/div. v out 2v/div. v en 5v/div. v sw 10v/div. i l 2a/div. v out 2v/div. v pg 5v/div. v sw 10v/div. i l 5a/div. v out 2v/div. v pg 5v/div. v sw 10v/div. i l 5a/div. v out 2v/div. v pg 5v/div. v sw 10v/div. i l 5a/div. v out 2v/div. v pg 5v/div. v sw 10v/div. i l 5a/div. shutdown through en i out = 0a shutdown through en i out = 3a scp entry i out =0a to short circuit scp entry i out =3a to short circuit scp recovery short circuit to i out =0a scp recovery short circuit to i out =3a
ev9943-q-00a ? 36v, 410khz, 3a peak, step-down converter ev9943-q-00a rev.1.0 www.monolithicpower.com 6 9/17/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom layer
ev9943-q-00a ? 36v, 410khz, 3a peak, step-down converter notice: the information in this document is subject to change wi thout notice. please contact m ps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. ev9943-q-00a rev.1.0 www.monolithicpower.com 7 9/17/2014 mps proprietary information. patent protec ted. 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 power supply output between 6.5v and 30v, 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 board will automatically start up. 5. to use the enable function, apply a digital input to the en/sync pin. drive en higher than 1.4v to turn on the regulator, or less than 1.25v to turn it off. 6. to use the external synchronous function to adjust the switching frequency, apply an external clock signal to en/sync pin.
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