G5520 Global Mixed-mode Technology Inc. Bias Power Supply for TFT LCD Panels Features regulator with an integrated 20V N-Channel 0.7Ω MOSFET that allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient response to pulsed loading while achieving efficiency over 90%. The device can produce output voltage as high as 18V from an input as low as 2.8V. 2.5V to 5.5V Input Supply Range 1.2MHz Current-Mode Boost Regulator Fast Transient Response to Pulse Load ±1% Accurate Output Voltage Built-In 20V/1.8A, 0.7Ω N-Channel MOSFET High Efficiency up to 90% Over-Current Protection Output Under-Voltage Protection High-Performance Operational Amplifier ±150mA Output Short-Circuit Current 12V/μs Slew Rate 12MHz, -3dB Bandwidth Rail-to-Rail Input and Output 600kHz Negative Charge Pump Driver for VGL 600kHz Positive Charge Pump Driver for VGH Power-On Sequence Control Thermal-Overload Protection TQFN3X3-16 Package The VCOM buffer can drive the LCD VCOM voltage that features high short-circuit current (150mA), fast slew rate (12V/μs), wide bandwidth (12MHz) and rail-to-rail input/output. A positive and a negative charge-pump driver provide adjustable regulated output voltages VGH and VGL to bias the TFT. Both the charge-pump driver operate with 600kHz switching frequency. The G5520 includes internal power-up sequencing, over/under voltage protections of the boost converter, and over temperature protection to ensure in safe operating. Applications Photo Frame GPS UMPC The G5520 are available in a 16-pin 3X3TQFN packages. General Description Ordering Information The G5520 includes a high-performance boost regulator, a VCOM buffer (unity gain OPA), a VGH charge pump driver, and a VGL charge pump driver for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5520R41U 5520 -40°C to +85°C TQFN3X3-16 Note: R4:TQFN3X3-16 Bonding Code: 1 U: Tape & Reel The boost converter provides the regulated supply voltage for the panel source driver ICs. The converter is a high switching frequency (1.2MHz) current mode 12 FB 11 IN 10 LX FBN DRVP FBP COMP 15 14 13 9 8 4 SUP NC 7 3 OPAO AGND Thermal Pad 6 2 OPAI REF 5 1 NC DRVN 16 Pin Configuration PGND G5520 TQFN3X3-16 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.5 Oct 15, 2009 1