G2500 Global Mixed-mode Technology Integrated Power Supply for TFT-LCD Panels with 1-Channel White LED Driver Features General Description The G2500 includes a high-performance boost regulator, a VCOM buffer (unity gain OPA), a VGH charge pump driver, a VGL charge pump driver, and white LED driver for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). 2.5V to 5.5V Input Supply Range Active-High Enable Control 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 White LED Driver 1MHz Switching Frequency 20V/1.2A, 0.3Ω N-channel MOSFET Input Under Voltage Protection Over Current Protection Over Voltage Protection Digital Dimming Control Power-On Sequence Control Thermal-Overload Protection RoHs Compliant TQFN4X4-24 Package 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 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. 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 charge-pump drivers operate with 600kHz switching frequency. The LED driver automatically regulated supply voltage for the LED light bars without the need to calculate the output for different LED types. It also integrates a 20V n-channel MOSFET that provides high output power. The low reference voltage minimized the power loss across the current-setting resistor. An enable input can be pulsed repeatedly to adjust LED’s brightness. The boost converter of the LED driver incorporates over current protection and over voltage protection to ensure safety operation. Applications Notebook Computer Displays UMPCs Medium Size LCD Panel The G2500 includes internal power-up sequencing, over/under voltage protections of the boost converter, and over temperature protection to ensure in safe operating. The G2500 is available in a 24-pin 4X4 TQFN package. Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G2500R51U 2500 -40°C to 85°C TQFN4X4-24 Note: R5: TQFN4X4-24 1: Bonding Code U: Tape & Reel TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.1 Aug 14, 2013 1 G2500 Global Mixed-mode Technology DRVP FBP COMP FB VCC LX Pin Configuration 24 23 22 21 20 19 NC 1 18 PGND 17 NC LXB 2 PGNDB 3 16 AVDD Thermal PAD VCCB 4 15 OPAO 8 9 G2500 10 11 12 AGND AGNDB 7 VREF 13 EN DRVN ENB 6 FBN 14 OPAI FBB OVP 5 TQFN4X4-24 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.1 Aug 14, 2013 2