G5562 datasheet(3/4 Pages) GMT

3 / 4 page

Ver: 0.4

Dec 20, 2011

TEL: 886-3-5788833

http://www.gmt.com.tw

G5562A

Global Mixed-mode Technology

Bias Power Supply with High-Speed Amplifier and

High-Accuracy LDO for LCD TVs

Features

8V to 14V Input Voltage Range

500kHz/750kHz Fixed Switching Frequency

VS Step-Up Converter

Current Mode

1% Feedback Accuracy

Output Voltage Range up to 20V

3A Switch Current

Adjustable Soft Start

Adjustable Current Limit

VLOGIC Step-Down Converter

Current Mode

1% Feedback Accuracy

2.5A Switch Current

2.5ms Internal Soft Start

150mA Negative Charge Pump Driver for VGL

150mA Positive Charge Pump Driver for VGH

Integrated High Voltage Switch for Gate Volt-

age Shaping

High Voltage LDO for VREF

0.5% Feedback Accuracy

0.5V Dropout at 60mA Output Current

High-Speed Operational Amplifier

20MHz -3dB Bandwidth

45 V/µs Slew Rate

±200-mA Short-Circuit Current

Gate Drive Signal to Drive External MOSFET

XAO Comparator

Thermal Shutdown

Available in 7mmx7mm 48-pin TQFN Package

Applications

LCD TV Panels

General Description

The G5562A DC-DC converter provides regulated volt-

ages 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 power-

supply requirements of large screen LCD panels. The

step-up converter provides source voltages VS and the

step-down converter provides logic voltage for the sys-

tem. 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 pro-

vides fast transient response and eases loop stabiliza-

tion. 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.

Ordering Information

ORDER

NUMBER

MARKING

TEMP.

RANGE

PACKAGE

(Green)

G5562AR11U

5562A

-40°C~ +85°C

TQFN7X7-48

Note: R1: TQFN7X7-48

1: Bonding Code

U: Tape & Reel

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