ev28164-d-00a high efficiency single inductor buck-boost dc-dc converter evaluation board ev28164-d-00a rev.1.0 www.monolithicpower.com 1 10/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. the future of analog ic technology description the ev28164-d-00a evaluation board is designed to demonstrate the capabilities of mps? mp28164. the mp28164 is a highly-efficient, low quiescent current buck-boost converter, which operates from input voltage above, below and equal to the output voltage. the device provides power solution for products powered by a one-cell lithium-ion or multi-cell alkaline battery applications where the output voltage is within battery voltage range. the mp28164 operates with input voltage from 1.2v to 5.5v to provide adjustable output voltage (1.5v to 5v), and is available in qfn10- 3x3mm package. electrical specification parameter symbol value units start-up voltage v st 1.8-5.5 v operation voltage v in 1.2 ? 5.5 v output voltage v out 3.3 v output current i out 0 ? 2 (1) a features ? 1.8v minimum startup input voltage ? 1.2v to 5.5v input work range ? 4a switching current limit ? 2mhz switching frequency ? selectable psm / pwm mode. ? typical 25 a quiescent current ? high efficiency up to 95%. ? load disconnect during shutdown ? internal soft start and compensation ? power good indicator ? hiccup mode for scp ? otp,ovp ? small qfn-11(2mmx3mm) package applications ? battery-powered product ? portable instruments ? tablet pc ? super-cap charger 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. note 1): this board can support 2a load if vin>2.4v, the load capability is lower when vin<2.4v due to inductor peak current limit. ev28164-d-00a evaluation board (l w h) 5.08cm 5.08cm 1.3cm board number mps ic number ev28164-d-00a MP28164GD 50 55 60 65 70 75 80 85 90 95 100 0.001 0.01 0.1 1 10
ev28164-d-00a D high efficiency si ngle inductor buck-boost dc-dc converter evb ev28164-d-00a rev.1.0 www.monolithicpower.com 2 10/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. evaluation board schematic ev28164-d-00a bill of materials qty ref value description package manufacturer manufacturer p/n 3 c1, c2a, c2b 22 f ceramic cap,10v,x5r 0805 murata grm21br61a226ke19l 1 c3 1 f ceramic cap,10v,x7r 0603 murata grm188r71a105ka61d 1 jp1 header, 3-pin di 1 l1 1 h 4.6mohm, 19a inductor smd wurth 744311100 1 r1 560k film res., 1% 0603 yageo rc0603fr-07560k 1 r2 100k film res., 1% 0603 yageo rc0603fr-07100k 2 r3,r4 100k film res., 5% 0603 yageo rc0603jr-07100k 1 u1 mp28164 1.8-5.5v, 2mhz,4a, buck-boost converter qfn-11 (2mmx3mm) mps MP28164GD
ev28164-d-00a D high efficiency si ngle inductor buck-boost dc-dc converter evb ev28164-d-00a rev.1.0 www.monolithicpower.com 3 10/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. e vb test results performance waveforms are tested on the evaluation board. v in = 3.3v, v out = 3.3v, l=1h, c out = 2x22f, t a = 25c, unless otherwise noted. 50 55 60 65 70 75 80 85 90 95 100 0.001 0.01 0.1 1 10 50 55 60 65 70 75 80 85 90 95 100 1.5 2 2.5 3 3.5 4 4.5 5 5.5 50 55 60 65 70 75 80 85 90 95 100 0.001 0.01 0.1 1 10 40 50 60 70 80 90 100 1.5 2 2.5 3 3.5 4 4.5 5 5.5 -0.6 -0.4 -0.2 0.2 0 0.4 0.6 0 0.5 1 1.5 2 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 0 5 10 15 20 25 30 35 40 45 0 0.5 1 1.5 2 2.5 3 3.5 0 5 10 15 20 25 30 35 40 0 0.5 1 1.5 2 2.5 0 0.2 0.4 0.6 0.8 1 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
ev28164-d-00a D high efficiency si ngle inductor buck-boost dc-dc converter evb ev28164-d-00a rev.1.0 www.monolithicpower.com 4 10/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the evaluation board. v in = 3.3v, v out = 3.3v, l=1h, c out = 2x22f, t a = 25c, unless otherwise noted. v out_ac 50mv/div. v sw1 2v/div. v sw2 2v/div. i l 2a/div. v out_ac 10mv/div. v sw1 2v/div. v sw2 2v/div. i l 500ma/div. v out_ac 100mv/div. v sw1 2v/div. v sw2 2v/div. i l 1a/div. v out_ac 100mv/div. v sw1 2v/div. v sw2 2v/div. i l 1a/div. v out_ac 100mv/div. v sw1 2v/div. v sw2 2v/div. i l 1a/div. v out_ac 10mv/div. v sw1 2v/div. v sw2 2v/div. i l 500ma/div. v out_ac 10mv/div. v sw1 2v/div. v sw2 2v/div. i l 500ma/div. v out_ac 50mv/div. v sw1 2v/div. v sw2 2v/div. i l 2a/div. v out_ac 10mv/div. v sw1 2v/div. v sw2 2v/div. i l 2a/div.
ev28164-d-00a D high efficiency si ngle inductor buck-boost dc-dc converter evb ev28164-d-00a rev.1.0 www.monolithicpower.com 5 10/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the evaluation board. v in = 3.3v, v out = 3.3v, l=1h, c out = 2x22f, t a = 25c, unless otherwise noted. v out_ac 50mv/div. v sw1 2v/div. v sw2 2v/div. i l 2a/div. v out 2v/div. v sw1 2v/div. v pg 2v/div. v in 2v/div. v sw2 2v/div. i l 500ma/div. v out 2v/div. v pg 2v/div. v pg 2v/div. v pg 2v/div. v sw1 2v/div. v sw2 2v/div. i l 1a/div. v out 2v/div. v sw1 2v/div. v sw2 2v/div. i l 1a/div. v out 2v/div. v sw1 2v/div. v sw2 2v/div. i l 5a/div. v out 2v/div. v sw1 2v/div. v sw2 2v/div. i l 1a/div. v out 2v/div. v sw1 2v/div. v sw2 2v/div. i l 2a/div. v out_ac 50mv/div. v sw1 2v/div. v sw2 2v/div. i l 2a/div. v out_ac 20mv/div. v sw1 2v/div. v sw2 2v/div. i l 2a/div. v pg 2v/div. v pg 2v/div. v in 2v/div. v in 2v/div. v in 2v/div. v in 2v/div. v in 2v/div.
ev28164-d-00a D high efficiency si ngle inductor buck-boost dc-dc converter evb ev28164-d-00a rev.1.0 www.monolithicpower.com 6 10/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the evaluation board. v in = 3.3v, v out = 3.3v, l=1h, c out = 2x22f, t a = 25c, unless otherwise noted. v out 2v/div. v pg 2v/div. v en 5v/div. v pg 2v/div. v en 5v/div. v pg 2v/div. v en 5v/div. v sw1 2v/div. v sw2 2v/div. i l 500ma/div. v out 2v/div. v sw1 2v/div. v pg 2v/div. v en 5v/div. v en 5v/div. v en 5v/div. v sw2 2v/div. i l 1a/div. v out_ac 200mv/div. i load 500ma/div. v out_ac 200mv/div. i load 500ma/div. v out_ac 200mv/div. i load 500ma/div. v out 2v/div. v sw1 2v/div. v sw2 2v/div. i l 1a/div. v out 2v/div. v sw1 2v/div. v sw2 2v/div. i l 2a/div. v out 2v/div. v sw1 2v/div. v sw2 2v/div. i l 500ma/div. v out 2v/div. v sw1 2v/div. v sw2 2v/div. i l 2a/div. v pg 2v/div. v pg 2v/div.
ev28164-d-00a D high efficiency si ngle inductor buck-boost dc-dc converter evb ev28164-d-00a rev.1.0 www.monolithicpower.com 7 10/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the evaluation board. v in = 3.3v, v out = 3.3v, l=1h, c out = 2x22f, t a = 25c, unless otherwise noted. v out 2v/div. v sw1 2v/div. v sw2 2v/div. i l 2a/div. v out 2v/div. v sw1 2v/div. v sw2 2v/div. i l 2a/div.
ev28164-d-00a D high efficiency si ngle inductor buck-boost dc-dc converter evb ev28164-d-00a rev.1.0 www.monolithicpower.com 8 10/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. printed circuit board layout figure 1: top silkscreen layer figure 2: top layer figure 3: bottom layer
ev28164-d-00a D high efficiency si ngle inductor buck-boost dc-dc converter evb 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. ev28164-d-00a rev.1.0 www.monolithicpower.com 9 10/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. quick start guide 1. preset the load to some value, e.g. 0.5a, notice that the mp28164 may enter scp hiccup if starting up with a heavier load due to the startup current limit which is for inrush protection.. 2. connect the positive and negative terminals of t he load to the vout and gnd pins, respectively. 3. preset the power supply?s output voltage (1.8~5.5v), and then turn off the power supply. 4. connect the positive and negative terminals of the power supply output to the vin and gnd pins, respectively. 5. turn on the power supply. the mp28164 demo board will automatically start up. 6. to use the enable function, apply a digital input to the en pin. drive en higher than 1.2v to turn on the regulator or less than 0.4v to turn it off. 7. to use mode pin for forced ccm operation, please turn off vin then connect the jumper jp1 to vin. 8. if other output voltage is preferred, the output voltage vout can be programmed by changing r1 and r2 according to below equation: fb out fb v r2 r1 vv = ? where fb v . is typically 0.5v, and r1, r2?s units are in k
, v out ?s unit is in v. the value of r1 is recommended to be from 300 k
through 620 k
for better efficiency at light load. the recommended output voltage can be from 1.5v through 5v.
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