G5565 Global Mixed-mode Technology Quad-Output TFT LCD Bias Power General Description Features The G5565 DC-DC converter provides regulated voltages 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 complete the power- supply requirements of large screen LCD panels. The step-up converter provides source voltages VAVDD and the step-down converter provides logic voltage VLOGIC 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. Input Supply Range: 9.5V ~ 14V Current mode Boost converter for AVDD ¾ Adjustable switching frequency ¾ Integrated 20V/4A ,0.1Ω switching N-MOSFET ¾ 1.5% accurate with 3.5-A switching current Buck Converter for VLOGIC ¾ Fixed 750kHz switching frequency ¾ Integrated 12-V/0.2-C Switching N-MOSFET ¾ 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 ¾ Input Under Voltage Lockout (UVLO) ¾ Thermal overload Protection (TOP) ¾ Over-Voltage Protection for (OVP) ¾ Over-Current Protection (OCP) ¾ Output Under Voltage Protection (UVP) ¾ Short Circuit Protection (SCP) Available in TQFN-5X5-28 Package Both step-up and step-down converters operate in asynchronous switch mode. Current mode control provides fast transient response and eases loop stabilization. Fault protection includes cycle-by-cycle current limit, thermal shutdown and short-circuit protection, and over voltage protection of the step-up converter. Applications The G5565 is available in a 28-pin TQFN (5mm x 5mm) package. TFT LCD Displays 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 PGND ENA2 ENA1 DRVP 24 23 22 PGND 26 25 LX LX 28 21 FBP 2 20 FSW 3 19 DLY1 OS 1 AGND FB 27 Pin Configuration Thermal Pad 18 COMPB 17 FBB 11 12 13 14 DLY2 CBOOT LXB LXB VIN 10 VIN 15 VDC 16 7 8 6 9 SS REF FBN 4 5 DRVN GD COMP G5565 TQFN5X5-28 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. Ver: 0.1 Aug 06, 2012 TEL: 886-3-5788833 http://www.gmt.com.tw 1