EV1531DQ-002A low power, triple output step-up plus charge pump for tft bias evaluation board ? initial release 10/04, rev. 1.1 www.monolithicpower.com 1 monolithic power systems general description the EV1531DQ-002A evaluation board is designed to demonstrate the capabilities of mps? mp1531 triple output step-up converter with charge-pumps. the mp1531 includes a 250khz fixed-frequency step-up converter and a positive and negative linear regulator. the linear regulators are powered via charge-pumps driven by the step-up converter switch node. a single on/off control enables all 3 outputs. the outputs are internally sequenced at power- on for ease of use. an internal soft-start prevents overloading the input source at startup. cycle-by-cycle current limit reduces component stress. electrical specification parameter symbol value units input voltage v in 2.7-5.5 v main output voltage v main 5 v main output current i main 100 ma (+) charge pump voltage v gh 15 v (+) charge pump current i gh 5 ma (?) charge pump voltage v gl ?10 v (?) charge pump current i gl 5 ma features ? 2.7v to 5.5v operating input range ? 500ma switch current limit ? 3 outputs in single package ? step-up converter up to 22v ? positive 10ma linear regulator ? negative 10ma linear regulator ? 250m ? internal power mosfet switch ? up to 95% efficiency ? 1a shutdown mode ? fixed 250khz frequency ? positive regulator up to 38v ? negative regulator down to -20v ? internal power-on sequencing ? adjustable soft-start/fault timer ? thermal shutdown ? cycle-by-cycle over current protection ? under voltage lockout ? ready flag applications ? tft lcd displays ? portable dvd players ? tablet pcs ? car navigation displays , ?mps?, ?monolithic power systems? , and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. EV1531DQ-002A evaluation board dimensions (2.34?x x 2.25?y x 0.50?z) board number mps ic number EV1531DQ-002A mp1531 100 90 80 70 60 50 40 30 20 efficiency (%) 0 100 200 300 400 500 600 load current (ma) mp1531-ec01 efficiency vs load current delivered by step-up converter v in = 3.3v v main = 5v v in = 4.2v
EV1531DQ-002A ? low pwr, tri-output step-up + charge pump for tft bias evaluation board ? initial release 10/04, rev. 1.1 www.monolithicpower.com 2 evaluation board schematic mp1531 gl en fb3 fb2 sw ct rdy fb1 pgnd in3 gh in2 comp in gnd ref v main +5v d1 b0530w jp1 123 u1 d3 bas40-04-7 d7 bas40-04-7 d2 bas40-04-7 d8 bas40-04-7 d9 bas40-04-7 d4 bas40-04-7 d5 ns c25 ns c26 ns c21 ns d6 ns c5 10nf c4 ns c2 10nf v gh +15v v gl -10v v in 2.7v-4.2v rdy gnd gnd gnd gnd c13 ns sw sw en c9 56pf c11 56pf ev1531_s01 EV1531DQ-002A bill of materials qty ref description manufacturer p/n distributor p/n 6 d2, d3, d4,d7,d8,d9 schottky diodes, dual, 40v, 200ma, sot-23 diodes inc: bas40-04-7 digikey bas40-04dict-nd 1 d1 schottky diode, 30v, 0.5a, sod-123 diodes inc: b0530w digikey: b0530wdict-nd 2 d5,d6 ns 5 c4,c13,c21,c 25,c26 ns 12 c12,c14,c15, c16,c17,c18, c19,c20, c22,c23,c24, c27 ceramic capacitor, 0.33f, 50v, 0805, x7r avx: 08055c334kat2a digikey: 478-1402-1-nd 1 c3 ceramic capacitor, 10f, 10v, 1210, x5r avx:1210zc106kat2a digikey: 478-1625-1-nd
EV1531DQ-002A ? low pwr, tri-output step-up + charge pump for tft bias evaluation board ? initial release 10/04, rev. 1.1 www.monolithicpower.com 3 EV1531DQ-002A bill of materials (continued) qty ref description manufacturer p/n distributor p/n 1 c1 ceramic capacitor, 22f, 10v, 1210, x5r avx:1210zd226kat2a digikey: 478-1632-1-nd 2 c8,c10 ceramic capacitor, 1f, 25v, 1206, x7r avx:12063c105kat2a digikey: 478-1567-1-nd 2 c2, c5 ceramic capacitor, 10nf, 50v, 0805, x7r avx:0805c103kat2a digikey: 478-1383-1-nd 2 c6,c7 ceramic capacitor, 0.1f, 50v, 0805, x7r avx:08055c104kat2a digikey: 478-1395-1-nd 2 c9,c11 ceramic capacitor, 56pf, 50v, 0805, npo avx:08055a560jat2a digikey: 478-1313-1-nd 1 l1 inductor, 33h, 740ma coicraft:lp06013--333kx 1 u1 mp1531dq, qfn16 mps: mp1531dq 2 r1,r11 resistor, 100k ? , 0805, 5% panasonic: erj-6geyj104v digikey: p100kact-nd 1 r4 resistor, 5.6k ? , 0805, 5% panasonic: erj-6enf562v digikey: p5.6kcct-nd 1 r2 resistor, 30.1k ? , 0805, 1% panasonic: erj-6geyj303v digikey: p30kact-nd 3 r3,r5,r8 resistor, 10k ? , 0805, 1% panasonic: erj-6geyj103v digikey: p10kact-nd 1 r9 resistor, 110k ? , 0805, 1% panasonic: erj-6gey114v digikey: p110kact-nd 2 r6,r10 resistor, 10 ? , 0805, 5% panasonic: erj-6geyj100v digikey: p10act-nd 1 r7 resistor, 80.6k ? , 0805, 1% panasonic: erj-6enf8062v digikey: p80.6kcct-nd 1 jp1 conn jumper sullins: stc02syan digikey: s9000-nd
EV1531DQ-002A ? low pwr, tri-output step-up + charge pump for tft bias evaluation board ? initial release 10/04, rev. 1.1 www.monolithicpower.com 4 printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom layer
EV1531DQ-002A ? low pwr, tri-output step-up + charge pump for tft bias evaluation board ? initial release notice: mps believes the information in this document to be accurate and reliable. however, it is subject to change without notice. contact mps for current specificat ions. mps encourages users of its products to ensure that third party intellectual property rights are not infringed upon when integrating mps products in to any application. mps cannot assume any legal responsibility for any said applications. EV1531DQ-002A rev. 1.1 monolithic power systems, inc. 5 10/13/04 983 university avenue, buil ding a, los gatos, ca 95032 usa ? 2004 mps, inc. tel: 408-357-6600 ? fax: 408-357-6601 ? www.monolithicpower.com test results 100 90 80 70 60 50 40 30 20 efficiency (%) 0 100 200 300 400 500 600 load current (ma) mp1531-tpc01 efficiency vs load current delivered by step-up converter v in = 3.3v v main = 5v v in = 4.2v mp1531_wf02 power-up sequencing v in = 3.3v, v main = 5v, i main = 100ma, v gh = 15v, i gh = 5ma, v gl = -10v, i gl = 5ma, c ct =10nf i main 50ma/div v main 50mv/div v en 5v/div mp1531_wf01 load transient v in = 3.3v, v main = 5v, 5ma-50ma step v gh = 15v, i gh = 5ma, v gl = -10v, i gl = 5ma v main 5v/div v gh 10v/div v gl 10v/div 10ms/div quick start guide the three output voltages of this board are set to +5v, +15v, and -10v. the board layout accommodates most commonly used inductors and output capacitors. 1. make sure jumper jp1 is connected between 2 and 3. 2. attach positive end of loads to vmain, vgh,and vgl pins respectively. attach negative end of loads to gnd pins. 3. attach input voltage 2.7v v in 5.5v and input ground to vin and gnd pins respectively. 4. during startup rdy will be left high. once the turn-on sequence is complete, this pin will be pulled low if all regulators exceed 80% of their specified voltages. after all regulators are turned on, a fault in any regulator will cause rdy to go low after approximately 15s. if the fault persists for more than approximately 6ms (for c ct = 10nf), the entire chip will shut down.
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