G2523 Global Mixed-mode Technology Integrated LCD Bias Power Supply Features General Description 2.6V~5.5V Supply Range Current Mode Boost Regulator for AVDD 0.15Ω/20V/3A Embedded NMOS switch Fixed 1.2MHz Switching Frequency Up to 85% Efficiency 1% Output Regulation Voltage Mode Buck-Boost Regulator for VGL Fixed 600kHz Switching Frequency Up to 85% Efficiency 1% Output Regulation Charge Pump Regulator for VGH 3-Channel Rail-to-Rail Unity-Gain Operational The G2523 includes a high-performance boost regulator, a buck-boost controller, a high voltage charge pump regulator, 3 VCOM buffers (unity-gain OPA) for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). The boost regulator provides the regulated supply voltage for the panel source driver ICs. It is a high switching frequency (1.2MHz) current-mode regulator with an integrated 20V/0.15Ω NMOS switch that allows the use of ultra small inductors and ceramic capacitors. It provides fast transient response to pulsed loading while achieving efficiency over 85%. The device can produce output voltage as high as 18V from an input as low as 2.8V. Amplifier ±200mA Output Short Circuit Current 20V/µs Slew Rate 18MHz, -3dB Bandwidth Built-In Power On Sequence and Soft Start Function Protections: Input Under Voltage Lockout (UVLO) Over Current Protection for AVDD (OCP) Output Under Voltage Protection for AVDD, VGH and VGL (UVP) Output Over Voltage Protection for AVDD, VGL (OVP) Operational Amplifier Short Circuit Protection (SCP) Over Temperature Protection (OTP) QFN5X5-32 Package RoHS Compliant A voltage mode buck-boost controller cooperates with external temperature sensor provide compensated gate-off voltage supply to the level shifters. While the charge pump controller regulates the external charge pump voltage source to supply for other devices. The VCOM buffer can drive the LCD VCOM voltage that features high short-circuit current (200mA), fast slew rate (20V/µs), wide bandwidth (8MHz) and rail-to-rail input/output. The G2523 features extensive protection functions that include UVLO, OCP, UVP, OVP, and OTP. It is available in a QFN5X5-32 package. Applications LCD TV Panel LCD Monitor Panel Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G2523QA1U 2523 -40°C to +85°C QFN5X5-32 Note: QA: QFN5X5-32 1: Bonding Code U: Tape & Reel TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.1 Aug 22, 2013 1 G2523 Global Mixed-mode Technology SW1 SW1 PGND PGND FB COMP1 AGND DRVP 32 31 30 29 28 27 26 25 Pin Configuration AVIN 1 24 FBP VSUP 2 23 VREF OPAO3 3 22 NTC OPAI3 4 21 END OPAO2 5 20 DRVN OPAI2 6 19 NC OPAO1 7 18 COMP2 OPAI1 8 17 FBN 13 15 16 VDTS VREF VGL 14 12 NC PU 11 NC FLT 9 10 OGND Thermal Pad G2523 QFN5X5-32 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. Typical Application Circuit TEL: 886-3-578833 http://www.gmt.com.tw Ver: 0.1 Aug 22, 2013 2