EV0055 (mp1530) triple output step-up plus charge pump for tft bias evaluation board EV0055 rev. 1.3 www.monolithicpower.com 1 8/22/2005 mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. the future of analog ic technology tm tm description the EV0055 evaluation board is designed to demonstrate the capabilities of mps? mp1530 triple output step-up converter which is capable of powering a tft panel from a regulated 3.3v or 5v. the mp1530 includes a 1.4mhz fixed-frequency step-up converter and a positive and negative linear regulator. the linear regulators are powered from a charge-pump driven by the step-up converter switch node (sw). a single on/off control enables all 3 outputs. the outputs are internally sequenced at power on and power off for ease of use. an internal soft-start prevents overloading the input source at startup. cycle-by-cycle over current protection limits component overstress. electrical specifications parameter symbol value units input voltage v in 2.7 ? 5.5 v output voltage 1 v main +13 v output current 1 i main 350 ma output voltage 2 v gh +27 v output current 2 i gh 20 ma output voltage 3 v gl ?8.5 v output current 3 i gl 20 ma features ? 2.7 to 5.5v operating input range ? 2.8a switch current limit ? 3 outputs in single package ? step-up converter up to 22v ? positive 20ma linear regulator ? negative 20ma linear regulator ? 250m ? internal power mosfet switch ? up to 95% efficiency ? 1a shutdown mode ? fixed 1.4mhz 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? and ?the future of analog ic technology? are trademarks of monolithic power systems, inc. EV0055 evaluation board dimensions (2.4?x x 2.3?y x 0.4?z) board number mps ic number EV0055 mp1530dq 100 90 80 70 60 50 40 30 efficiency (%) 1 10 100 1000 load current (ma) mp1530_ec01 efficiency vs load current (step-up converter only) v in =3.3v v in =5v
EV0055 (mp1530) triple output step-up plus charge pump for tft bias evaluation board EV0055 rev. 1.3 www.monolithicpower.com 2 8/22/2005 mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. tm evaluation bo ard schematic mp1530 gl en fb3 fb2 pgnd in3 gh in2 comp in gnd ref sw 12 13 14 15 16 11 10 9 8 7 6 5 4 3 2 1 ct fb1 mp1530_s01 rdy r6 93.1k ? r3 6.8k ? r7 10k ? c19 ns c21 ns c20 ns d2 ns c3 10nf r2 100k ? r5 10k ? r10 0 ? r4 68.1k ? r8 205k ? r11 0 ? r9 10k ? r1 100k ? c2 10nf c12 0.1 f c16 0.1 f c7 0.1 f c6 1 f 25v c17 330pf c18 330pf c9 0.1 f u1 c13 1 f 50v c11 0.1 f c10 0.1 f c4 0.1 f c5 0.1 f d1 1n5819hw d5 bas40-04-7 d4 bas40-04-7 d3 bas40-04-7 l1 4.7 f 2.3a c1 10 f 6.3v c14 ns c8 10 f 25v c15 ns v in rdy gnd v main gnd gnd v gh v gl en gnd
EV0055 (mp1530) triple output step-up plus charge pump for tft bias evaluation board EV0055 rev. 1.3 www.monolithicpower.com 3 8/22/2005 mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. tm EV0055 bill of materials qty ref value description package manufacturer p/n distributor p/n 1 c1 10 f ceramic capacitor, 6.3v, x5r 1210 panasonic: ecj-4yb1a106k digikey: pcc2170ct-nd 2 c2, c3 10nf ceramic capacitor, 50v, x7r 0805 panasonic: ecj-2vb1h103k digikey: pcc103bnct-nd 8 c4, c5, c7, c9, c10, c11, c12, c16 0.1 f ceramic capacitor, 50v, x7r 0805 panasonic: ecj-2yb1h104k digikey: pcc1840ct-nd 1 c6 1 f ceramic capacitor, 25v, x7r 1206 panasonic: ecj-3yb1e105k digikey: pcc1893ct-nd 1 c8 10 f ceramic capacitor, 25v, x5r 1210 panasonic: ecj-4yb1e106m digikey: pcc2243ct-nd 1 c13 1 f ceramic capacitor, 50v, x7r 1210 tdk: c3225x7r1h105k digikey: 445-1430-1-nd 5 c14, c15, c19, c20, c21 ns not stuffed 2 c17, c18 330pf ceramic capacitor, 50v, npo 0805 panasonic: ecj-2vc1h331j digikey: pcc471cgct-nd 1 d1 schottky diode, 40v, 1a sod-123 diodes inc: 1n5819hw-7 digikey: 1n5819hwdict-nd 1 d2 ns not stuffed 3 d3, d4, d5 schottky diodes, dual, 40v, 200ma sot23 diodes inc: bas40-04-7 digikey: bas40-04dict-nd 1 l1 4.7 h 2.26a, smd, unshielded toko: 817fy-4r7m=p3 2 r1, r2 100k ? resistor, 5% 0805 panasonic: erj-6geyj104v digikey: p100kact-nd 1 r3 6.8k ? resistor, 5% 0805 panasonic: erj-6geyj682v digikey: p6.8kact-nd 1 r4 68.1k ? resistor, 1% 0805 panasonic: erj-6enf6812v digikey: p68.1kcct-nd 3 r5, r7, r9 10k ? resistor, 5% 0805 panasonic: erj-6geyj103v digikey: p10kact-nd 1 r6 93.1k ? resistor, 1% 0805 panasonic: erj-6enf9312v digikey: p93.1kcct-nd 1 r8 205k ? resistor, 1% 0805 panasonic: erj-6enf2053v digikey: p205kcct-nd 2 r10, r11 0 ? resistor, 5% 0805 panasonic: erj-6gey0r00v digikey: p0.0act-nd 1 u1 mp1530 qfn16 (3x3) mps: mp1530dq
EV0055 (mp1530) triple output step-up plus charge pump for tft bias evaluation board EV0055 rev. 1.3 www.monolithicpower.com 4 8/22/2005 mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. tm printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom layer
EV0055 (mp1530) triple output step-up plus charge pump for tft bias evaluation 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 th ird 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. EV0055 rev. 1.3 www.monolithicpower.com 5 8/22/2005 mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. tm quick start guide the three output voltages of this board are set to +13v, +27v, and ?8.5v. the board layout accommodates most commonly used inductors and output capacitors. 1. attach the positive end of loads to the vmain, vgh and gnd (for the negative output) pins, respectively. attach negative ends of the loads to gnd and vgl (for the negative output) pins. 2. attach an input voltage 2.7v v in 5.5v and input ground to the vin and gnd pins, respectively. 3. the demo board starts up automatically once v in is applied due to the pull-up resistor r1. to disable the mp1530 connect the en pin to ground. 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 high after approximately 15 s. if the fault persists for more than approximately 6ms (for ct=10nf), the entire chip will shut down. 5. to adjust the output voltages: use a 10k ? to 50k ? for the low-side resistor of each voltage divider (i.e. r7, r9 and r5). v fb1 = v fb3 = v ref = 1.25v. for the step-up converter, determine the high-side resistor r6 using the equation: ? ? ? ? ? ? ? ? ? = 7 r v v v 6 r 1 fb 1 fb main where v main is the output voltage of the step-up converter. for the positive charge-pump, determine the high-side resistor r8 by the equation: ? ? ? ? ? ? ? ? ? = 9 r v v v 8 r 3 fb 3 fb gh where v gh is the output voltage of the positive linear regulator. determine the number of positive charge pump stages (n pos ) by: d main main dropout gh pos v 2 v v v v n ? ? + = use v dropout = 1v and v d = 0.4v for schottky diodes. for the negative charge-pump, determine the high-side resistor r4 by the equation: ? ? ? ? ? ? ? ? ? = 5 r v v 4 r ref gl where v gl is the output voltage of the negative linear regulator. determine the number of negative charge pump stages (n neg ) by: d main dropout gl neg v 2 v v v n ? + ? = use v dropout = 0.3v and v d = 0.4v for schottky diodes.
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