液晶电视面板专用芯片   G5562AR11U   TQFN-48

G5562A带高速放大器和  液晶电视用高精度LDO  致新G5562AR11U

General Description

The G5562A DC-DC converter provides regulated voltages

required by thin-film transistor (TFT) liquid crystal

displays (LCD) panels in TQFN 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 response and eases loop stabilization.

Fault protection includes cycle-by-cycle current

limit, thermal shutdown, and output-fault shutdown.

Current mode control is used for both charge pumps to

regulate its output voltage, which minimizes output

ripple and capacitor sizes. High voltage switch is used

for gate voltage shaping to improve TFT-LCD display

quality.

The G5562A includes one high-speed high-current

operational amplifier and one high-accuracy LDO for

Gamma buffer reference.

The G5562A is available in a 48-pin TQFN package.