ev2106dq/dk-00a 2.6v to 15v in, 1.5a out synchronous buck converter evaluation board ev2106dq/dk-00a rev. 1.3 www.monolithicpower.com 1 11/18/2005 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. the future of analog ic technology general description the ev2106dq/dk-00a is an evaluation board designed to demonstrate the abilities of the mp2106dq and mp2106dk synchronous buck converters, respectively. it can convert an input voltage with a range of 2.6v to 15v to a lower output voltage from 0.9v while delivering 1.5a to the load. the output voltage is preset to 1.8v, but can be easily be adjusted to other levels from 0.9v. fault condition protection includes cycle-by-cycle current limiting, thermal shutdown and under voltage lockout. the part?s current mode control, high switching frequency and integrated high-side and low-side power mosfets, combined with tiny 10-pin msop or qfn packages, provide a solution requiring a minimum of components, board area and cost. electrical specifications parameter symbol value units input voltage v in 2.6 to 15 v output current i load 1.5 a features ? up to 1.5a continuous output current ? wide 2.6v to 15v operating input range ? internal power switches ? 800khz fixed switching frequency ? all ceramic input and output capacitors ? programmable soft-start ? programmable input under voltage lockout applications ? soho routers, pcmcia cards, mini pci ? handheld computers ? pdas ? cellular phones ? digital still and video cameras ? small lcd displays ?mps? and ?the future of analog ic te chnology?, are registered trademarks of monolithic power systems, inc. ev2106dq/dk-00a evaluation board dimensions (2.4?x x 1.8?y x 0.4?z) board number mps ic number ev2106dq/dk-00a mp2106dq/dk 100 90 80 70 60 50 40 30 20 10 0 efficiency (%) 10 100 1000 10000 load current (a) mp2106_tac_ec02 v in =5v v in =3.3v
ev2106dq/dk-00a ? 2.6v to 15v in, 1.5a out synchronous buck ev board ev2106dq/dk-00a rev. 1.3 www.monolithicpower.com 2 11/18/2005 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. evaluation board schematic mp2106 bst vin fb lx sgnd vref pgnd run ss comp c7 10nf c4 ns c6 ns c1 ns c11 ns 3 2 6 1 8 7 5 4 9 10 c9 ns v out d1 1n5819 c3 10nf r5 ns c10 10nf c5 3.3nf off on v in ev2106_s01 ev2106dq/dk-00a bill of materials qty ref value description package manufacturer manufacturer p/n 5 c1, c4, c6, c9, c11 do not stuff 1 c2 (1) 10f ceramic cap, 10v, x7r sm1210 avx 1210zc106kat2a 1 c8 22f ceramic cap, 6.3v, x5r sm1210 tdk c3225x5r0j226m 3 c3, c7, c10 10nf ceramic cap, 50v, x7r sm0805 avx 08055c103kat2a 1 c5 3.3nf ceramic cap, 50v, x7r sm0805 avx 08055c332kat2a 1 d1 schottky diode, 40v, 1a sod123 diodes inc 1n5819hw-7 1 l1 5h inductor, 2.2a smd sumida cdrh6d26-5r0 1 r1 100k ? film res, 5% sm0805 panasonic erj-6geyj104v 1 r2 6.8k ? film res, 5% sm0805 panasonic erj-6geyj682v 2 r3, r4 10k ? film res, 1% sm0805 panasonic erj-6enf1002v 1 r5 do not stuff 1 u1 dc-dc converter qfn10 mps mp2106dq note: 1) for v in > 10v, use a 16v capacitor for c2.
ev2106dq/dk-00a ? 2.6v to 15v in, 1.5a out synchronous buck ev board ev2106dq/dk-00a rev. 1.3 www.monolithicpower.com 3 11/18/2005 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom silk layer figure 4?bottom layer
ev2106dq/dk-00a ? 2.6v to 15v in, 1.5a out synchronous buck ev board notice: the information in this document is subject to change wi thout notice. please contact mps 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. ev2106dq/dk-00a rev. 1.3 www.monolithicpower.com 4 11/18/2005 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. quick start guide the output voltage of this board is set to 1.8v. the board layout accommodates most commonly used inductors and output capacitors. 1. attach positive end and negative end of load to out and gnd pins, respectively. 2. attach input voltage (2.6v v in 13.5v) and input ground to in and gnd pins, respectively. 3. a pull-up resistor has connected the en pin to the in pin, so the mp2106 will startup automatically without applying an external voltage to the en pin. 4. the output voltage v out can be changed by varying r3. calculate the new value using the formula: ) 1 v v ( 4 r 3 r fb out ? = where v fb = 0.9v and r4 = 10k ? . for example, for v out = 2.5v: ? ? = ? ? = ? = k 8 . 17 ~ k 78 . 17 ) 1 v 9 . 0 v 5 . 2 ( k 10 ) 1 v v ( 4 r 3 r fb out for the closest standard 1% value. see maximum duty cycle limits to determine allowable output voltages.
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