ver: 0.1 sep 09, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 global mixed-mode technology G2561 programmable multi-output tft lcd bias power features ? input supply range: 8v ~ 14v ? current mode sync-boost converter for avdd ? fixed 750khz switching frequency ? 2.2a to 5a programmable current limit ? 13.5v to 19.8v programmable output ? integrated 20v/0.1 ? switching n-mosfet ? buck converter for vlogic ? fixed 750khz switching frequency ? 2.2v to 3.7v programmable output ? integrated 12v/0.2 ? switching n-mosfet ? positive charge-pump regulator for vgh ? 20v to 35v programmable output ? thermal compensation ? negative charge-pump regulator for vgl ? -4.5v to -13.5v programmable output ? built-in power-on sequence and soft-start function ? isolation switching pmos for avdd ? protection function ? input under voltage lockout (uvlo) ? over-temperature protection (otp) ? over-voltage protection (ovp) ? over-current protection (ocp) ? output under voltage protection (uvp) ? short circuit protection (scp) ? 2-wire i 2 c slave mode interface ? available in qfn6x6-40 package applications ? tft lcd displays general description the G2561 dc-dc converter provides regulated volt- ages required by thin-film transistor (tft) liquid crystal displays (lcd) panels in qfn6x6-40 package. one synchronous step-up converter, one asynchr onous step-down converter, and two charge pumps regulators convert the 8v to 14v input voltage into four output voltages with 1 channel opamp. these features com- plete the power- supply requirements of large screen lcd panels. the step-up converter provides source voltages v avdd and the step-down converter provides logic voltage v logic for the system. the dual charge pumps regulators independently generate adjustable regulated output voltages vgl and vgh to bias the lcd using external charge pump attached to the switching node. the step-up converter and step-down converter operate with a fixed switching frequency of 750khz, and all output are programmable. the G2561 is available in a 40-pin qfn (6mm x 6 mm) package. ordering information order number marking temp. range package (green) G2561qg1u 2561 -40 c to 85 c qfn6x6-40 note: qg: qfn6x6-40 1: bonding code u: tape & reel pin configuration lx vl ntc pgnd lx lxi lxo lxo vgl drvn boot1 vinb1 vinb1 avin sda scl a0 hvs xao comp lxb1 outb1 re vghm vgh en op_out ognd nc vflk a1 nc drvp nc G2561 qfn6x6-40 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 pad 30 29 28 27 26 25 24 23 22 21 40 39 38 37 36 35 34 33 32 31 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 thermal pad 30 29 28 27 26 25 24 23 22 21 40 39 38 37 36 35 34 33 32 31 pos vsup agnd neg note: recommend connecting the thermal pad to the ground for excellent power dissipation. pgnd lxb1
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