evq4559dn-00a 1.5a, 55v, 2mhz step-down converter evaluation board aec-q100 qualified evq4559dn-00a rev. 1.0 www.monolithicpower.com 1 12/23/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the evq4559dn-00a is an evaluation board for the mpq4559, a high frequency step-down regulator with an integrated power mosfet. the mpq4559 integrates a 250m ? mosfet that provides 1.5a load current over a wide operating input voltage of 4.5v to 55v. current mode control provides fast transient response and eases loop stabilization. an internal soft-start prevents inrush current at turn-on. the evq4559dn-00a is a fully assembled and tested pcb. it generates a +3.3v output voltage at load current up to 1.5a from an 8v to 55v input range. switching frequency is set at 500khz. electrical specifications parameter symbol value units input voltage v in 8 ? 55 v output voltage v out 3.3 v output current i out 1.5 a features ? 1.5a output current ? programmable switching frequency up to 2mhz ? wide 8v to 55v operating input range ? adjustable output from 0.8v ? fully assembled and tested applications ? high voltage power conversion ? game machines ? automotive systems ? industrial power systems ? distributed power systems ? printer systems ? battery powered systems 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. evq4559dn-00a evaluation board (l x w x h) 2.5? x 2.5? x 0.4? (6.35cm x 6.35cm x 1.0cm) board number mps ic number evq4559dn-00a MPQ4559DN 0 0.5 1 1.5 2 i out (a) efficiency (%) 40 50 60 70 80 90 100 efficiency @v out =3.3v fs=500khz v in =55v v in =12v
evq4559dn-00a ? 1.5a, 55v, 2mhz step- down converter evaluation board evq4559dn-00a rev. 1.0 www.monolithicpower.com 2 12/23/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. evaluation board schematic c4 ns c6 680pf c7 ns c5 100nf d2 d3 ns d1 ns u1 c11 ns c10 ns gnd v out gnd vin vin en freq gnd bst 5 1 4 3 7 2 6 8 sw fb comp mpq4559 en evq4559dn-00a bill of materials qty ref value description package manufacturer part number 2 c1, c2 2.2f ceramic cap., 100v, x7r 1210 murata grm32er72a225ka35l 1 c3 0.1f ceramic cap., 100v, x7r 0805 tdk c2012x7r2a104k 4 c4, c7, c10,c11 not stuffed 1 c5 100nf ceramic cap., 50v, x7r 0603 tdk c1608x7r1h104k 1 c6 680pf ceramic cap., 50v, x7r 0603 tdk c1608x7r1h681k 1 c8 22f ceramic cap., 16v, x7r 1210 murata grm32er71c226me18l 1 c9 0.1f ceramic cap., 50v, x7r 0805 tdk c2012x7r1h104k 1 r1 24.9k ? film res., 1% 0603 yageo rc0603fr-0724k9l 1 r2 100k ? film res., 1% 0603 yageo rc0603fr-07100kl 1 r3 200k ? film res., 1% 0603 yageo rc0603fr-07200kl 1 r4 40.2k ? film res., 1% 0603 yageo rc0603fr-0740k2l 1 r5 42.2k ? film res., 1% 0603 yageo rc0603fr-0742k2l 1 r6 124k ? film res., 1% 0603 yageo rc0603fr-07124kl 2 d1, d3 not stuffed 1 d2 diode schottky, 90v, 2a smb diodes inc b290-13-f inductor, 4.3a smd toko d104c-#919as-100m inductor, 4a smd cooper sd8350-100-r 1 l1 10h inductor, 3.6a smd wurth 744066100 1 u1 step-down regulator so8 mps MPQ4559DN
evq4559dn-00a ? 1.5a, 55v, 2mhz step- down converter evaluation board evq4559dn-00a rev. 1.0 www.monolithicpower.com 3 12/23/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. evb test results performance waveforms are tested on the evaluation board. v in = 12v, v out =3.3v, c1 = 4.7f, c2 = 22f, l1 = 10h and t a = +25 ? c, unless otherwise noted. 0 10 20 30 40 50 60 70 80 90 100 efficiency (% ) efficiency (% ) output current (a) output current (a) output voltage ripple i out =0.1a v out ac coupled 10mv/div v sw 10v/div i l 500ma/div output voltage ripple i out =1a v out ac coupled 10mv/div v sw 10v/div i l 1a/div output voltage ripple i out =1.5a v out ac coupled 10mv/div v sw 10v/div i l 1a/div 0 10 20 30 40 50 60 70 80 90 0 0.5 1 1.5 0 0.5 1 1.5 vin=12v vin=55v vin=12v vin=48v on resistance vs. junction temperature 150 200 250 300 350 400 450 500 -50 -25 0 25 50 75 100 125 junction temperature ( c) v in start-up vs. junction temperature 2.90 2.95 3.00 3.05 3.10 3.15 3.20 3.25 v in start-up voltage (v) voltage reference vs. junction temperature 0.780 0.785 0.790 0.795 0.800 0.805 0.810 voltage reference (v) -50 -25 0 25 50 75 100 125 junction temperature ( c) -50 -25 0 25 50 75 100 125 junction temperature ( c) 480 485 490 495 500 505 510 -50 -25 0 25 50 75 100 125 junction temperature ( c) switching frequency (khz)
evq4559dn-00a ? 1.5a, 55v, 2mhz step- down converter evaluation board evq4559dn-00a rev. 1.0 www.monolithicpower.com 4 12/23/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the evaluation board. v in = 12v, v out =3.3v, c1 = 4.7f, c2 = 22f, l1 = 10h and t a = +25 ? c, unless otherwise noted. v en 2v/div v out 2v/div v sw 10v/div i l 1a/div 10ms/div i out =0.1a i out =1a v en 2v/div v out 2v/div v sw 10v/div i l 1a/div 4ms/div v en 2v/div v out 2v/div v sw 10v/div i l 2a/div i out =1.5a 4ms/div shut down i out =0.1a v en 2v/div v out 2v/div v sw 10v/div i l 1a/div 1ms/div shut down i out =1a v en 2v/div v out 2v/div v sw 10v/div i l 1a/div shut down start up start up start up i out =1.5a v en 2v/div v out 2v/div v sw 10v/div i l 2a/div short circuit entry i out =0.1a to short v out 2v/div v sw 10v/div i l 1a/div v out 2v/div v sw 10v/div i l 1a/div short circuit steady state short circuit recovery i out =short to 0a v out 2v/div v sw 10v/div i l 2a/div
evq4559dn-00a ? 1.5a, 55v, 2mhz step- down converter evaluation board evq4559dn-00a rev. 1.0 www.monolithicpower.com 5 12/23/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom layer
evq4559dn-00a ? 1.5a, 55v, 2mhz step- down converter evaluation board notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. evq4559dn-00a rev. 1.0 www.monolithicpower.com 6 12/23/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. quick start guide 1. connect the positive and negative terminals of the load to the vout and gnd pins, respectively. 2. preset the power supply output to between 8 and 55v, and then turn it off. 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 evq4559dn will automatically startup. 5. to use the enable function, apply a digital input to the en pin. drive en higher than 1.8v to turn on the regulator, drive en less than 1.2v to turn it off. 6. an input under voltage lockout (uvlo) function is implemented by the addition of a resistor divider r1 and r2. the en threshold is 1.2v (falling edge), so v in uvlo threshold is ? ? ? ? ? ? ? ? 1 r 2 r 1 v 2 . 1 . it is preset to 6v on this board. 7. use r4 and r6 to set the output voltage with v fb = 0.8v. for r4 = 40.2k ? , r6 can be determined by: ?? 8 . 0 v 25 . 50 6 r out ? ? ? (k ? ). follow the application information section in the device datasheet to recalculate the compensation, inductor and output capacitor values when output voltage is changed.
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