EVM3805-QB-00A 6v, 0.6a synchronous step-down switcher evaluation board EVM3805-QB-00A rev.1.1 www.monolithicpower.com 1 12/30/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the EVM3805-QB-00A is used for demonstrating the performance of mps?s mpm3805 a low voltage high switching frequency step-down switcher with built-in power mosfets and power inductor. mpm3805 provides up to 0.6a highly efficient output with constant-on-time control for fast loop response. high power efficiency over a wide load range is achieved by scaling down the switching frequency at light load to reduce the switching related loss by constant on time control. short circuit and thermal shutdown provides reliable, fault-tolerant operation. mpm3805 is available in qfn 3.0x2.5x0.9mm package. electrical specification parameter symbol value units input voltage v in 2.5? 6 v output voltage v out 1.2 v output current i out 0.6 a features ? wide 2.5v to 6v operating input range ? fixed and adjustable output from 0.6v ? 3mm x 2.5mm x 0.9mm qfn package ? total solution size 6mm x 3.8mm ? up to 0.6a output current ? 100% duty cycle in dropout ? ultra low iq: 17 a ? en and power good for power sequencing ? cycle-by-cycle over-current protection ? short circuit protection with hiccup mode ? adjustable output only needs 4 external components - 2 ceramic capacitors and fb divider resistors ? fixed output only needs input and output capacitors applications ? low voltage i/o system power ? ldo replacement ? power for portable products ? storage (ssd/hdd) ? space-limited applications all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under quality assurance. ?mps? and ?the future of analog ic technology?, are registered trademarks of monolithi c power systems, inc. EVM3805-QB-00A evaluation board board number mps ic number EVM3805-QB-00A mpm3805gqb
EVM3805-QB-00A ? 6v, 0.6a, sync step-down switcher EVM3805-QB-00A rev.1.1 www.monolithicpower.com 2 12/30/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. evaluation board schematic 10v c1a 6 r5 r4 c2 r1 mpm3805 gqb c1 ns + 0.5a r2 r1 40.2k 40.2k c4a 10 1,2 5,6 9 8 10 11 10v c4 10 EVM3805-QB-00A bill of materials qty refdes value description package manufacturer manufacturer p/n 3 c1a, c4, c4a 10 f ceramic cap., 10v, x5r sm0805 tdk c2012x5r1a106k 2 c1,c2 ns 1 r1 40.2k film res., 5% sm0603 any 1 r2 40.2k film res.,5% sm0603 any 1 r4 ns 1 r5 100k ? film res., 1% sm0603 yageo rc0603fr-07100kl 1 u1 cot buck qfn3.0*2.5 mps mpm3805gqb
EVM3805-QB-00A ? 6v, 0.6a, sync step-down switcher EVM3805-QB-00A rev.1.1 www.monolithicpower.com 3 12/30/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. printed circuit board layer figure 1: top silk layer figure 2: top layer figure 3: bottom layer
EVM3805-QB-00A ? 6v, 0.6a, sync step-down switcher 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. EVM3805-QB-00A rev.1.1 www.monolithicpower.com 4 12/30/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 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 2.5v and 6v, 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. layout recommendation of mpm3805 proper layout of the switching power supplies is very important, and sometimes critical to make it work properly. especially, for the high switching frequency converter, if the layout is not carefully done, the regulator could show poor line or load regulation, stability issues.
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