ev3421-g-00a 5.5a, 600khz synchronous step-up converter with output disconnect evaluation board ev3421-g-00a rev.1.0 www.monolithicpower.com 1 12/25/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. the future of analog ic technology description ev3421-g-00a evaluation board is designed to demonstrate the capability of mp3421. mp3421 is a high-efficiency, synchronous, current-mode, step-up converter with output disconnect. the mp3421 can provide inrush current limiting and output short-circuit protection. it can work with an input voltage as low as 1.9v. the integrated p-channel synchronous rectifier improves efficiency and eliminates the need for an external schottky diode. the pmos disconnects the output from the input when the part shuts down. the 600khz switching frequency allows for small external components, while the internal compensation and soft-start minimize the external component count. the mp3421 is available in 14-pin qfn 2mmx2mm package. electrical specification paramete r symbol v alue units input voltage v in 2.8 ? 4.2 (1) v output voltage v out 5 v output current i out 0 ? 2.1 a features ? 1.9v to 5.5v input work range ? 2.5v to 5.5v output range ? internal synchronous rectifier ? 600khz fixed frequency switching ? >5.5a switch current limit capability ? 43ua quiescent current ? high efficiency over full load range ? internal soft-start and compensation ? true output load disconnect from input ? ocp, scp, ovp and otp protection ? small qfn2x2-14 package applications ? battery-powered products ? power banks, juice packs, battery back-up units ? usb power supply ? consumer electronic accessories ? tablets 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. note: 1) this board can supply 5v/2.1a load from 2.8v-4.2v inpu t power, it can work with lower than 2.8v input but the load capability is lower than 2.1a, it can work with higher than 4.2 v input but it may trigger down mode with high power-loss when v in is close to v out . ev3421-g-00a evaluation board (l x w x h ) 6.35cm x 6.35cm x 0.6cm board numbe r mps ic numbe r ev3421-g-00a MP3421GG
ev3421-g-00a ?5.5a, 600khz synchronous step-up converter ev3421-g-00a rev.1.0 www.monolithicpower.com 2 12/25/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evaluation board schematic (2)(3)(4) out en in ina a gnd fb pgnd sw mp3421 u1 1.5uh l1 22uf c2b 22uf c2c 22uf c1b 22uf c1a vin=2.8-4.2v vout=5v gnd gnd gnd gnd gnd 787k r1 150k r2 100k r3 1uf c2a gnd gnd notes: 2) ina pin needs short to vin. 3) it is strongly recommended control ic on/off through en pin. 4) it is optimized for typical 5v output with 1.5 h inductor, the feedback compensation may need change for other output voltage or other inductance. ev3421-g-00a bill of materials qty re f v alue description package manufacture r part numbe r 4 c1a, c1b, c2b, c2c 22 f ceramic cap, 10v,x7r 1210 murata grm32er71a226ke20l 1 c2a 1 f ceramic cap,10v,x5r 0603 murata grm188r61a105ka61d 1 l1 1.5 h rdc=6.6m ? , ir=11a,isat=14a, smd wurth 744311150 1 r1 787k ? film res,1% 0603 yageo rc0603fr-07787kl 1 r2 150k ? film res,1% 0603 royal rl0603fr-07150kl 1 r3 100k ? film res,1% 0603 royal rl0603fr-07100kl 1 u1 mp3421 5.5a synchronous step-up converter with output disconnect qfn-14 2mmx2mm mps MP3421GG
ev3421-g-00a ?5.5a, 600khz synchronous step-up converter ev3421-g-00a rev.1.0 www.monolithicpower.com 3 12/25/2014 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 = 3.3v, v out = 5v, l = 1.5h, t a = 25oc, unless otherwise noted.
ev3421-g-00a ?5.5a, 600khz synchronous step-up converter ev3421-g-00a rev.1.0 www.monolithicpower.com 4 12/25/2014 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 = 3.3v, v out = 5v, l = 1.5h, t a = 25oc, unless otherwise noted.
ev3421-g-00a ?5.5a, 600khz synchronous step-up converter ev3421-g-00a rev.1.0 www.monolithicpower.com 5 12/25/2014 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 = 3.3v, v out = 5v, l = 1.5h, t a = 25oc, unless otherwise noted.
ev3421-g-00a ?5.5a, 600khz synchronous step-up converter ev3421-g-00a rev.1.0 www.monolithicpower.com 6 12/25/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom layer
ev3421-g-00a ?5.5a, 600khz synchronous step-up converter 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. ev3421-g-00a rev.1.0 www.monolithicpower.com 7 12/25/2014 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 to 5v. the board layout accommodates most commonly used components. 1. preset power supply to 2.8v v in 4.2v. 2. turn power supply off. 3. connect power supply terminals to: a. positive (+): vin b. negative (?): gnd 4. connect load to: a. positive (+): vout b. negative (?): gnd 5. turn power supply on after making connections. 6. the mp3421 is enabled on the evaluation board once vin is applied. 7. the output voltage vout can be changed by varying r2. calculate the new value using the formula: out fb r1 r2 vv r2 + = where v fb = 0.807v and r1=787k ? . 8. to use the enable function, apply a digital input to the en pin. drive en higher than 1.2v to turn on mp3421 or less than 0.4v to turn it off.
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