ver: 0.1 aug 06, 2012 tel: 886-3-5788833 http://www.gmt.com.tw 1 global mixed-mode technology G5565 quad-output tft lcd bias power features ? input supply range: 9.5v ~ 14v ? current mode boost converter for avdd ? adjustable switching frequency ? integrated 20v/4a ,0.1 ? switching n-mosfet ? 1.5% accurate with 3.5-a switching current ? buck converter for vlogic ? fixed 750khz switching frequency ? integrated 12-v/0.2-c switching n-mosfet ? 1.5% accurate with 1.5-a switching current ? charge-pump regulator for vgon & vgoff ? built-in power-on sequence and soft-start function ? gd signal to drive external p-mosfet ? protection function ? input under voltage lockout (uvlo) ? thermal overload protection (top) ? over-voltage protection for (ovp) ? over-current protection (ocp) ? output under voltage protection (uvp) ? short circuit protection (scp) ? available in tqfn-5x5-28 package applications ? tft lcd displays general description the G5565 dc-dc converter provides regulated volt- ages required by thin-film transistor (tft) liquid crystal displays (lcd) panels in tqfn5x5-28 package. one step-up converter, one step-down converter, and two charge pumps regulators converter the 8v to 14v input voltage into four output voltages. 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 operates with a adjustable switching frequency from 500khz to 2mhz. and step-down converter operates with a fixed switching frequency of 750khz. both step-up and step-down converters operate in asynchronous switch mode. current mode control pro- vides fast transient response and eases loop stabiliza- tion. fault protection includes cycle-by-cycle current limit, thermal shutdown and short-circuit protection, and over voltage protection of the step-up converter. the G5565 is available in a 28-pin tqfn (5mm x 5 mm) package. ordering information order number marking temp. range package (green) G5565r61u 5565 -40 c ~ +85 c tqfn5x5-28 note: r6: tqfn5x5-28 1: bonding code u: tape & reel pin configuration G5565 tqfn5x5-28 fbp fsw dly1 compb fbb vin os agnd fb gd comp ss 1 2 3 4 5 6 16 17 18 19 20 21 pgnd ena2 lx pgnd ena1 drvp 27 22 23 24 26 25 dly2 fbn cboot 8 9 10 11 12 vdc drvn thermal pad 7 lxb 13 14 lxb vin 15 lx 28 ref note: recommend connecting the thermal pad to the ground for excellent power dissipation. G5565 tqfn5x5-28 fbp fsw dly1 compb fbb vin os agnd fb gd comp ss 1 2 3 4 5 6 16 17 18 19 20 21 pgnd ena2 lx pgnd ena1 drvp 27 22 23 24 26 25 dly2 fbn cboot 8 9 10 11 12 vdc drvn thermal pad 7 lxb 13 14 lxb vin 15 lx 28 ref note: recommend connecting the thermal pad to the ground for excellent power dissipation.
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