ev1499-d-00a high-efficiency, 5a peak, 16v, 500khz, sync. step-down converter evaluation board ev1499-d-00a rev.1.0 www.monolithicpower.com 1 7/24/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. the future of analog ic technology description the ev1499-d-00a demonstrates mps?s mp1499, a high-frequency, synchronous, rectified, step-down converter with built-in high- side and low-side power mosfets. the mp1499 offers a very compact solution to achieve a 5a peak output current with excellent load and line regulation over a wide input supply range. the mp1499 has synchronous mode operation for higher efficiency over the output current load range. current-mode operation provides fast transient response and eases loop stabilization. protective features include over-current protection and thermal shutdown. the mp1499 is available in a space saving 10- pin qfn (23mm) package. electrical specification parameter symbol value units input voltage v in 5 ? 16 v output voltage v out 3.3 v output current i out 5 (peak) a features ? wide 5v to 16v operating input range ? 70m ? /25m ? low r ds(on) internal power mosfet ? proprietary switching-loss?reduction technique ? default 500khz switching frequency ? externally-programmable soft-start ? sync from 200khz to 2mhz external clock ? aam power save mode ? ocp protection and hiccup ? thermal shutdown ? output adjustable from 0.8v ? available in an qfn10(2 3mm) package applications ? digital set-top boxes ? 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. ev1499-d-00a evaluation board board number mps ic number ev1499-d-00a MP1499GD output current(a) efficiency vs. output current v out =3.3v 50 55 60 65 70 75 80 85 90 95 100 0.01 0.10 1.00 10.00 v in =16v v in =12v v in =5v
ev1499-d-00a ? 16v, 500khz, 5a peak step-down converter ev1499-d-00a rev.1.0 www.monolithicpower.com 2 7/24/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. evaluation board schematic 33k r8 40.2k r1 10 r5 13k r2 c3 2 1 l1 c2a c2b c2c 33pf c6 c1b c1a 0 r6 10 r7 1 vout 1 gnd 1 vin c4 100k r3 39k r4 ns c5 1 vcc 1 en/sync 22nf c7 1 ss 1 gnd gnd vout gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd ns d1 gnd fb 1 vi n 9 sw 8 gnd 6,7 bst 4 en/sync 3 vcc 2 ss 10 MP1499GD nc 5 u1 c1c gnd ev1499-d-00a bill of materials qty refdes value description package manufacturer manufacturer p/n 2 c1a,c1b 22 f ceramic cap., 25v, x5r 1210 murata grm32er61e226ke15l 2 c2a,c2b 22 f ceramic cap., 16v, x5r 1206 murata grm31cr61c226me15l 2 c1c, c2c 0.1 f ceramic cap., 25v, x7r 0805 murata grm21br71e104ka01l 2 c3,c4 0.1 f ceramic cap., 16v, x7r 0603 murata grm188r71c104ka01d c5 ns 1 c6 33pf ceramic cap., 50v, c0g 0603 murata grm1885c1h330ja01d 1 c7 22nf ceramic cap., 50v, x7r 0603 murata grm188r71h223ka01d 1 r1 40.2k thick film res., 1% 0603 yageo rl0603fr-0740k2l 1 r2 13k thick film res., 1% 0603 yageo rl0603fr-0713kl 1 r3 100k thick film res., 1% 0603 yageo rl0603fr-07100kl 1 r4 39k thick film res., 1% 0603 yageo rl0603fr-0739kl 1 r6 0 ? thick film res., 5% 0603 yageo rc0603fr-070rl 2 r5,r7 10 ? thick film res., 5% 0603 yageo rl0603fr-0710rl 1 r8 33k thick film res., 1% 0603 yageo rc0603fr-0733kl d1 ns 1 l1 3.3 h inductor,dcr=17.2m ? , is=11a wurth 744311330 1 u1 mp1499 gd synchronous step- down convert qfn23 mps MP1499GD
ev1499-d-00a ? 16v, 500khz, 5a peak step-down converter ev1499-d-00a rev.1.0 www.monolithicpower.com 3 7/24/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?inner layer1 figure 4?inner layer2
ev1499-d-00a ? 16v, 500khz, 5a peak step-down converter ev1499-d-00a rev.1.0 www.monolithicpower.com 4 7/24/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. figure 5?bottom layer
ev1499-d-00a ? 16v, 500khz, 5a 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. ev1499-d-00a rev.1.0 www.monolithicpower.com 5 7/24/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 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 5v and 16v, 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 pin. drive en higher than 1.4v to turn on the regulator or less than 1.25v to turn it off.
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