G5561A Datasheet | Global Mixed-mode Technology

Global Mixed-mode Technology Inc. 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 - 500k Hz/750k Hz Fixed Switching Frequency - 150m A Negative Charge Pump Driver for VGL - 150m A 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 plete 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 500k Hz or 750k Hz. Both step-up and step-down converters operate in asynchronous switch mode. Current mode control provides fast transient response and eases loop stabilization. Fault protection includes cycle-by-cycle current limit, thermal shutdown, overvoltage protection of the step-up converter and short-circuit protection of the step-down converter. Current mode control is used for both charge pumps to regulate its output voltage, which minimizes output ripple and capacitor sizes. The G5561A is available in an 28-pin TSSOP package. Ordering Information ORDER NUMBER G5561AF41U Note: F4: TSSP-28 (FD) 1: Bonding Code U: Tape &...