EVM3810-QB-01A 6v, 1.2a peak synchronous step-down switcher evaluation board EVM3810-QB-01A rev. 1.3 www.monolithicpower.com 1 8/4/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. the future of analog ic technology description the EVM3810-QB-01A is used for demonstrating the performance of mps?s mpm3810 a low voltage high switching frequency step-down switcher with built-in power mosfets and power inductor. mpm3810 provides up to 1.2a peak 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. mpm3810 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 1.2 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 1.2a peak 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. EVM3810-QB-01A evaluation board board number mps ic number EVM3810-QB-01A mpm3810gqb
EVM3810-QB-01A ? 6v, 1.2a peaksync step-down switcher EVM3810-QB-01A rev. 1.3 www.monolithicpower.com 2 8/4/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evaluation board schematic nc ns mpm3810 EVM3810-QB-01A bill of materials qty refdes value description package manufacturer manufacturer p/n 2 c1, c3 10 f ceramic cap., 10v, x5r sm0805 tdk c2012x5r1a106k 0 c2, c4 ns 1 r1 40.2k film res.,1% sm0402 any 1 r2 40.2k film res.,1% sm0402 any 1 r3 100k ? film res.,5% sm0402 any 1 u1 cot buck qfn 3.0*2.5 mps mpm3810gqb
EVM3810-QB-01A ? 6v, 1.2a peaksync step-down switcher EVM3810-QB-01A rev. 1.3 www.monolithicpower.com 3 8/4/2014 mps proprietary information. patent protec ted. 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
EVM3810-QB-01A ? 6v, 1.2a peaksync step-down switcher EVM3810-QB-01A rev. 1.3 www.monolithicpower.com 4 8/4/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. quick start guide (a djustable output) the output voltage of this board is set externally which can be regulated as low as 0.6v by operating from +2.5v to +6v input as the figure 5. the default output voltage of this board is set to 1.2v. 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. 5. the output voltage v out can be changed by varying r2. choose r1 to be around 40k ? to 80k ? . r2 is then given by: out r1 r2 v 1 0.6 = ? example: for vout= 1v, r1=40k ? , r2=60k ? . . figure 5?adjustable version figure 6?fixed version
EVM3810-QB-01A ? 6v, 1.2a peaksync step-down switcher 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. EVM3810-QB-01A rev. 1.3 www.monolithicpower.com 5 8/4/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. quick start guide (modific ation for fixed output) for modifying the evm3810qb-01a to accommodate a fixed output voltage version of the mpm3810gqb-12(-18,-25,-33) as the figure 6: 1. carefully remove the ic (u1) and replace it with the corresponding fixed output version of the mpm3810gqb-xx chip. 2. remove both r1 and r2. 3. connect the positive and negative terminals of the load to the vout and gnd pins, respectively. 4. preset the power supply output between 2.5v and 6v, and then turn off the power supply. 5. connect the positive and negative terminals of the power supply output to the vin and gnd pins, respectively. 6. turn the power supply on. the board will automatically start up. fixed output versions are shown in table_1. table_1. fixed output version information part number fixed vo (v) mpm3810gqb-12 1.2 mpm3810gqb-18 1.8 mpm3810gqb-25 2.5 mpm3810gqb-33 3.3 layout recommendation of mpm3810 proper layout of the switching power supplies is very important, and sometimes critical to make it work properly. especially, for the high switching converter, if the layout is not carefully done, the regulator could show poor line or load regulation, stability issues.
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