EVM3686-RU-00A 18v 20a step-down power module evaluation board EVM3686-RU-00A rev. 1.0 www.monolithicpower.com 1 7/23/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. the future of analog ic technology description the EVM3686-RU-00A is used for demonstrating the performance of mps? mpm3686, a 20a step-down power module with built-in power mosfets and power inductor. 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. over- current-protection, over-voltage protection, under-voltage protection, and thermal shutdown provide reliable operation. mpm3686 is available in qfn 12x15x4mm package. electrical specification paramete r symbol v alue units input voltage v in 8?18 v output voltage v out 1/1.2/1.5/1.8 v output current i out 20 a features ? complete 20a dc-to-dc solution ? wide input voltage range from 2.5v: -- 2.5v to 18v with external 5v bias -- 4.5v to 18v with internal bias ? 1% reference voltage over 0 ? c to 70 ? c junction temperature range ? adaptive cot control for ultrafast transient response ? programmable switching frequency from 200khz to 1mhz ? support pre-bias start up ? programmable soft-start time with default 3ms ? non-latch ocp, ovp and thermal shutdown ? output adjustable from 0.65v to 5v ? 12 x 15 x 4 (mm) qfn package applications ? telecom and networking systems ? base stations ? servers ? 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 quality assurance. ?mps? and ?the future of analog ic technology?, are registered trademarks of monolithi c power systems, inc. EVM3686-RU-00A evaluation board board numbe r mps ic numbe r EVM3686-RU-00A mpm3686gru
EVM3686-RU-00A ? 18v 20a step-down power module EVM3686-RU-00A rev. 1.0 www.monolithicpower.com 2 7/23/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evaluation board schematic
EVM3686-RU-00A ? 18v 20a step-down power module EVM3686-RU-00A rev. 1.0 www.monolithicpower.com 3 7/23/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. EVM3686-RU-00A bill of materials refdes value description package manufacturer manufacturer p/n c1 560pf cap, 25v, 5%, np0 cap0603 murata grm1885c1e561ja01d cin1, cin2 10uf capacitor, 25v, x7r, 10% cap1206 murata grm31cr71e106ka12l cin3 220uf 220uf, 25v, 20%, 22mohm esr sm8x12m m nichicon pcv1e221mcl2gs co1, co2, co3, co4, co5 47uf cap, 4v, x5r, 20% cap0805 murata grm21br60g476me15l r1 499k film res., 1% 0603 yageo rc0603fr-07499kl r2, r3 100k film res., 1% 0603 yageo rc0603fr-07100kl r4 6.49k film res., 1% 0603 yageo rc0603fr-076k49l r5 10k film res., 1% 0603 yageo rc0603fr-0710kl r6 15.4k film res., 1% 0603 yageo rc0603fr-0715k4l r7 21k film res., 1% 0603 yageo rc0603fr-0721kl u1 mpm3686 18v/20a power stage module qfn60- 15x12mm mps mpm3686gru miscellaneous banana jack non-insulated banana jack 575-4 keystone 575-4 j1 2mm, 8-pin dual row header 4x2x2mm wurth 620 008 211 21 jumper 2mm jumper 2x3.5mm wurth 608 002 134 21 test point 2.54mm pitch, 9-pin header 2.54mmx9 wurth 613 009 111 21 test point 2.54mm pitch, 3-pin header 2.54mmx3 wurth 613 003 111 21
EVM3686-RU-00A ? 18v 20a step-down power module EVM3686-RU-00A rev. 1.0 www.monolithicpower.com 4 7/23/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results performance waveforms are tested on the evaluation board. v in =12v, v out =1.2v, t a = 25c, unless otherwise noted.
EVM3686-RU-00A ? 18v 20a step-down power module EVM3686-RU-00A rev. 1.0 www.monolithicpower.com 5 7/23/2014 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 evaluation board. v in =12v, v out =1.2v, t a = 25c, unless otherwise noted.
EVM3686-RU-00A ? 18v 20a step-down power module EVM3686-RU-00A rev. 1.0 www.monolithicpower.com 6 7/23/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. printed circuit board layer figure 1: top silk layer figure 2: top layer figure 3: bottom silk layer figure 4: bottom layer
EVM3686-RU-00A ? 18v 20a step-down power module 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. EVM3686-RU-00A rev. 1.0 www.monolithicpower.com 7 7/23/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. quick start guide the output voltage of this board is set externally which can be regulated as 1v, 1.2v, 1.5v or 1.8v by choosing the jumper position. the input voltage can range from 8v to 18v. the minimum 8v input voltage is limited by the en signal, which is derived from vin through a resistor divider. lower input voltage (as low as 4.5v) can be set by fine tuning the resistor divider values. the following is the procedures to turn on the power module. 1. put the jumper to the position to the desired output voltage setting. 2. connect the positive and negative terminals of the load to the vout and gnd pins, respectively. 3. preset the power supply output between 8v and 18v, and then turn off the power supply. make sure the power supply has high enough current limit to supply the current. 4. connect the positive and negative terminals of the power supply output to the vin and gnd pins, respectively. 5. turn the power supply on. the power module will automatically start up.
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