ev5455-l-00a peak power assist for smart/ai-enabled speakers, evaluation board ev5455-l-00a rev.1.2 www.monolithicpower.com 1 2/2/2018 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. the future of analog ic technology description ev5455-l-00a evaluation board is designed to demonstrate the capabilities of mp5455. the mp5455 is designed as a peak power assist for low power applications, releasing energy as needed during peak loading events. the internal input-current-limit block with dv/dt control prevents inrush current during system start-up; the bus voltage start-up slew rate is programmable. mps?s patented power back-up control circuit minimizes the storage capacitor requirement. it pumps the input voltage to a higher storage voltage and releases the energy over a hold-up time to the system in the case of an input outage. the storage voltage and the release voltage are both programmable for different system requirements. the mp5455 is available in a space qfn20 (3mmx4mm) package. electrical specification parameter symbol value units input voltage v in 3.5-5 v charge voltage v strg 23.5 v bus release voltage v release 3.2 v boost inductor peak current i charge 0.4 a buck max output current i release 2 a features ? wide 2.7 to 7v operating input range for mp5455 ? 60m ? back to back switch for input current limit circuit and reverse current blocking ? reverse current protection ? 6v bus clamping voltage ? power on reset ? adjustable dv/dt slew rate for bus voltage start-up ? thermal protection ? available in an qfn20(3mmx4mm) package applications ? peak power smoother for smart speakers ? artificial intelligence (ai)-enabled speakers ? power back-up ? battery hold-up supplies a ll mps parts are lead-free, halogen free, and adhere to the rohs directive. fo r mps green status, please visit mps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks o f monolithic power systems, inc. ev5455-l-00a evaluation board (l x w) 6.35cm x 6.35cm board number mps ic number ev5455-l-00a MP5455GL release ? i b =2a, c strg =2 x 100 f ch1: v b 1v/div. ch2: v strg 10v/div. ch2: v sw 10v/div. ch4: i b 2a/div. 2ms/div.
ev5455-l-00a ? peak power assist (low-power) ev board ev5455-l-00a rev.1.2 www.monolithicpower.com 2 2/2/2018 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. evaluation board schematic pgnd agnd agnd pgnd agnd agnd agnd pgnd pgnd pgnd en vin vb agnd 953 r7 100k r5 3.4k r2 1uf c8 200k r9 100uf c7a 10.5k r1 4.7uh l1 0 r8 6.98k r10 nc d1 100k r6 ench 22uf c2 4.7uf c6 100nf c5 strg c1 100k r3 mp5455 1uf c4 ench sw en vin cst fbs ilim ich strg vbo bst fbb 100k r4 pgnd d2 pgnd 0.1uf dvdt agnd 10nf c3 pgnd 100uf c7b
ev5455-l-00a ? peak power assist (low-power) ev board ev5455-l-00a rev.1.2 www.monolithicpower.com 3 2/2/2018 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. ev5455-l-00a bill of materials qty ref value description package manufacturer manufacturer p/n 1 l1 4.7 h 4.7 h, dcr 19.5m ? , 7a smd wurth 744311470 1 r1 10.5k film res., 1% 0603 yageo rc0603fr-0710k5l 1 r2 3.4k film res., 1% 0603 yageo rc0603fr-073k4l 4 r3, r4, r5, r6 100k film res., 1% 0603 yageo rc0603fr-07100kl 1 r7 953 film res., 1% 0603 yageo rc0603fr-07953rl 1 r8 0 film res., 1% 0603 yageo rc0603fr-07200kl 1 r9 200k film res., 1% 0603 royal rl0603fr-07200kl 1 r10 6.98k film res., 1% 0603 yageo rc0603fr-076k98l 2 c1, c5 100nf ceramic cap., 25v, x7r 0603 murata grm188r71e104ka01d 1 c2 22 f ceramic cap., 10v, x5r 1206 murata grm31cr61a226me19l 1 c3 10nf ceramic cap., 16v, x7r 0603 murata grm188r71c103ka01d 2 c4, c8 1 f ceramic cap,50v,x5r 0603 yageo cc0603krx5r9bb106 1 c6 4.7 f ceramic cap,50v,x7r 1206 murata grm31cr71h475ka12l 2 c7a, c7b 100uf 50v/100 f cd284 jh ecr1hxy101m080011 0 d1 nc 1 d2 sma6j5.0a tvs diode sma vishat sma6j5.0a 1 u1 mp5455 MP5455GL qfn20- 3mmx4m m mps MP5455GL
ev5455-l-00a ? peak power assist (low-power) ev board ev5455-l-00a rev.1.2 www.monolithicpower.com 4 2/2/2018 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. evb test results performance waveforms are tested on the evaluation board. v in = 3.5v, v storage =23.5v, v release =3.2v, for dcdc converter: v out =3.2v, l=4.7h, t a = +25oc, unless otherwise noted. v in ? power ? on ? ench ? power ? on ch1: v b 1v/div. ch2: v strg 10v/div. ch2: v sw 10v/div. ch4: i l 1a/div. ch1: v b 1v/div. ch2: v strg 10v/div. ch2: v sw 10v/div. ch4: i l 1a/div. 50ms/div. 50ms/div. release ? i b =10ma, c strg =2 x 100 f release ? i b =1a, c strg =2 x 100 f ch1: v b 1v/div. ch2: v strg 10v/div. ch2: v sw 10v/div. ch4: i b 1a/div. ch1: v b 1v/div. ch2: v strg 10v/div. ch2: v sw 10v/div. ch4: i b 1a/div. 200ms/div. 5ms/div. release ? i b =2a, c strg =2 x 100 f release ? i b =2a, c strg =2 x 220 f ch1: v b 1v/div. ch2: v strg 10v/div. ch2: v sw 10v/div. ch4: i b 2a/div. ch1: v b 1v/div. ch2: v strg 10v/div. ch2: v sw 10v/div. ch4: i b 2a/div. 2ms/div. 5ms/div.
ev5455-l-00a ? peak power assist (low-power) ev board ev5455-l-00a rev.1.2 www.monolithicpower.com 5 2/2/2018 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. evb test results performance waveforms are tested on the evaluation board. v in = 3.5v, v storage =23.5v, v release =3.2v, for dcdc converter: v out =3.2v, l=4.7h, t a = +25oc, unless otherwise noted. release ? i b =2a, c strg =1000 f release ? i b =2a, c strg =2200 f ch1: v b 1v/div. ch2: v strg 10v/div. ch2: v sw 10v/div. ch4: i b 2a/div. ch1: v b 1v/div. ch2: v strg 10v/div. ch2: v sw 10v/div. ch4: i b 2a/div. 5ms/div. 10ms/div.
ev5455-l-00a ? peak power assist (low-power) ev board ev5455-l-00a rev.1.2 www.monolithicpower.com 6 2/2/2018 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom layer
ev5455-l-00a ? peak power assist (low-power) ev board 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. ev5455-l-00a rev.1.2 www.monolithicpower.com 7 2/2/2018 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. quick start guide the board layout accommodates most commonly used components. 1. connect the positive and negative terminals of the load to vb and gnd pins, respectively. 2. preset power supply to 3.5v. turn off power supply. 3. connect power supply terminals to: positive (+): vin negative (?): gnd 4. turn on power supply after making connections, mp5455 will charge the storage capacitor to 23.5v after dcdc converter completes start-up. 5. in order to observe the power release performance, following two methods can be applied: turn off the power supply. short vin to gnd directly. note: make sure bench power supply have output current limiting when doing this test. 6. use r1 and r2 to set release voltage: r2 r2 r1 0.79v v release ? ? ? similarly, r9 and r10 can be chosen for storage voltage setting: r10 r10 r9 0.79v v strg ? ? ?
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