G5520A 台湾致新代理商 GMT DC-DC系列液晶显示器的集成PMIC

Part Number	Vin (V)min.	Vin (V) max.	FSW (k Hz)	ILX (A)	VLX(V)	OPA S/R (V/us)	OPA ISC (mA)	Note	Package
G5520A	2.5	5.5	1200	1.8	20	12	150	Async-Boost, VGH/VGL Charge-Pump, VCOM, G5520A With EN, G5520S With XAO	TQFN3X3-16

Bias Power Supply for TFT LCD Panels

General Description The G5520A includes a high-performance boost regu-lator, a VCOM buffer (unity gain OPA), a VGH charge pump driver, and a VGL charge pump driver for ac-tive-matrix thin-film transistor (TFT) liquid-crystal dis-plays (LCDs).

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 0.7ΩMOSFET that allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient re-sponse 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 the charge-pump driver operate with 600kHz switching frequency.

The G5520A includes internal power-up sequencing, over/under voltage protections of the boost converter, and over temperature protection to ensure in safe op-erating.

The G5520A are available in a 16-pin 3X3TQFN packages.

Features
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, 0.7ΩN-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