G5529 Global Mixed-mode Technology Inc. Integrated Multi-Channel DC-DC Converter for TFT-LCD Panels age for the panel source driver ICs. The converter is a high switching frequency (640kHz or 1.2MHz) currentmode regulator with an integrated 20V N-Channel 0.2Ω 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. Soft-Start is programmed by external capacitor, which sets the input-current ramp-rate. Features 2.5V to 5.5V Input Supply Range 640kHz/1.2MHz Current-Mode Boost Regulator Fast Transient Response to Pulse Load ±1% Accurate Output Voltage Built-In 20V/2A, 0.2Ω N-Channel MOSFET High Efficiency up to 90% Programmable Soft-Start Over-Current Protection Output Under-Voltage Protection High-Performance Operational Amplifiers ±150mA Output Short-Circuit Current 12V/µs Slew Rate 12MHz, -3dB Bandwidth Rail-to-Rail Input and Output On-Chip GPM Controller Adjustable Falling Time and Power-On Delay Flicker Compensator Power-On Sequence Control Low Voltage Detector Programmable Detecting Voltage and Delay Time Charge pump for VGH regulation Thermal-Overload Protection RoHs Compliant TQFN4X4-24 Package The GPM is controlled by frame signals from timing controller to modulate the Gate-On voltage, VGHM, which acts a flicker compensation circuit to reduce the coupling effect between gate lines and pixels. It also can delay the Gate-On voltage while power-on for achieving a corrected power-on sequence for gate driver ICs. Both of power-on delay time and the falling time of the Gate-On voltage are programmable by external capacitor and resistor. The voltage detector monitors the supply voltage to issue a reset signal while the detected voltage is too low. The detecting level is decided by an external resistor divider and the delay time is programmable by an external capacitor. 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. Applications LCD Monitor Notebook Computer Displays LCD TVs Ordering Information General Description ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5529R51U 5529 -40°C to 85°C TQFN4X4-24 Note: R5: TQFN4X4-24 1: Bonding Code U: Tape & Reel The G5529 includes a high-performance boost regulator, a gate pulse modulator (GPM), a voltage detector, and a VCOM buffer (unity-gain OPA), for activematrix thin-film transistor (TFT) liquid-crystal displays (LCDs). The boost converter provides the regulated supply volt- P GND N.C. FB COMP N.C. OP AO 24 23 22 21 20 19 Pin Configuration LX 1 18 AVDD VIN 2 17 N.C. SS 3 16 N.C. AGND 4 15 VGH Therm al Pad 12 V FLK VDP M 11 10 9 CD RE SE T RE 8 VGHM 13 VDIV 14 6 7 5 N.C. OP AI FREQ G5529 TQFN4X4-24 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Sep 16, 2009 1