G5562 G5562A 台湾致新代理商 GMT DC-DC系列液晶显示器的集成PMIC

致新G5562 G5562A

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G5562/A 台湾致新代理商 GMT DC-DC系列液晶显示器的集成PMIC
Bias Power Supply with High-Speed Amplifier and High-Accuracy LDO for LCD TVs

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
G5562/A	8	14	500/ 750	3.0	20	45	200	Async-Boost, Async-Buck, VGH/VGL Charge-Pump, GPM, VCOM, Voltage Detector, HV LDO	TQFN7X7-48

General Description
The G5562/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 G5562/G5562A includes one high-speed high-current op-erational amplifier and one high-accuracy LDO for Gamma buffer reference.

The G5562/G5562A is available in a 48-pin TQFN package.

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