Global Mixed-mode Technology Inc.
G5561A
Quad-Output TFT LCD Bias DC-DC Converter
Features
8V to 14V Input Voltage ...
Global Mixed-mode Technology Inc.
G5561A
Quad-Output TFT LCD Bias DC-DC Converter
Features
8V to 14V Input Voltage Range VS Output Voltage Range up to 19 V 1% Accurate Boost Converter with 3A Switch
Current 1.5% Accurate 2.3A Step-Down Converter 500kHz/750kHz Fixed Switching Frequency 150mA Negative Charge Pump Driver for VGL 150mA Positive Charge Pump Driver for VGH Adjustable Sequencing for VGL, VGH Gate Drive Signal to Drive External MOSFET Internal and Adjustable Soft Start Cycle-by-Cycle Over Current Protection Short-Circuit Protection Overvoltage Protection Thermal Shutdown Available in TSSOP-28 Package
Applications
TFT LCD Displays
General Description
The G5561A DC-DC converter provides regulated voltages required by thin-film
transistor (TFT) liquid crystal displays (LCD) panels in TSSOP package. One step-up converter, one step-down converter, and two charge pumps convert the 8V to 14V input voltage into four output voltages. These features complete the powersupply requirements of large screen LCD panels. The step-up converter provides source voltages VS and the step-down converter provides logic voltage for the system. The dual charge pumps independently generate adjustable regulated output voltages VGL and VGH to bias the LCD. These four blocks operate with a fixed switching frequency of 500kHz or 750kHz.
Both step-up and step-down converters operate in asynchronous switch mode. Current mode control provides fast transient respons...