G2561 Global Mixed-mode Technology Programmable Multi-Output TFT LCD Bias Power Applications Features Input Supply Range: 8V ~ 14V Current Mode Sync-Boost Converter for AVDD ¾ Fixed 750kHz Switching Frequency ¾ 2.2A to 5A Programmable Current Limit ¾ 13.5V to 19.8V Programmable Output ¾ Integrated 20V/0.1Ω Switching N-MOSFET Buck Converter for VLOGIC ¾ Fixed 750kHz Switching Frequency ¾ 2.2V to 3.7V Programmable Output ¾ Integrated 12V/0.2Ω Switching N-MOSFET Positive Charge-Pump Regulator for VGH ¾ 20V to 35V Programmable Output ¾ Thermal Compensation Negative Charge-Pump Regulator for VGL ¾ -4.5V to -13.5V Programmable Output Built-in Power-On Sequence and Soft-Start Function Isolation Switching PMOS for AVDD Protection Function ¾ Input Under Voltage Lockout (UVLO) ¾ Over-Temperature Protection (OTP) ¾ Over-Voltage Protection (OVP) ¾ Over-Current Protection (OCP) ¾ Output Under Voltage Protection (UVP) ¾ Short Circuit Protection (SCP) 2-Wire I2C Slave Mode Interface Available in QFN6X6-40 Package TFT LCD Displays General Description The G2561 DC-DC converter provides regulated voltages required by thin-film transistor (TFT) liquid crystal displays (LCD) panels in QFN6X6-40 package. One synchronous step-up converter, one asynchronous 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 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 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 6mm) package. Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) 2561 -40°C to 85°C QFN6X6-40 G2561QG1U Note: QG: QFN6X6-40 1: Bonding Code U: Tape & Reel 31 POS 33 EN 32 VSUP 35 VGHM 34 VGH 36 RE 37 OUTB1 38 LXB1 BOOT1 40 39 LXB1 Pin Configuration VINB1 1 30 NEG VINB1 2 29 OP_OUT AVIN 3 28 OGND AGND 4 27 SDA 5 SCL 6 A0 HVS Thermal Pad Pad NC 26 VFLK 25 A1 7 24 NC 8 23 DRVP XAO 9 22 NC COMP 10 13 14 15 16 17 18 19 20 PGND LX LX LXI LXO LXO VGL 12 PGND 11 VL NTC 21 DRVN G2561 QFN6X6-40 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. Ver: 0.1 Sep 09, 2013 TEL: 886-3-5788833 http://www.gmt.com.tw 1