G2521 台湾致新代理商 GMT DC-DC系列液晶显示器的集成PMIC

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
G2521	2.6	5.5	600/ 1200	3.0	20	20	200	Async-Boost, VGH Regulator, OPA*3, Buck-Boost VGL with Temp. Comp., 7-CH -33V ~ +33V Level-Shifter	TQFN6X6-48

General Description
The G2521 includes a high-performance boost regulator, a buck-boost controller, a high voltage charge pump regulator, 3 VCOM buffers (unity-gain OPA), open-drain pull high VGLC signal generator and 7-channel level shifter with adjustable gate shading function for ac-tive-matrix thin-film transistor (TFT) liquid-crystal dis-plays (LCDs).

The boost regulator provides the regulated supply voltage for the panel source driver ICs. It is a high switching frequency (1.2MHz) current-mode regulator with an integrated 20V/0.1Ω NMOS switch that al-lows the use of ultra small inductors and ceramic ca-pacitors. It provides fast transient response to pulsed loading while achieving efficiency over 85%. The de-vice can produce output voltage as high as 18V from an input as low as 2.8V.

A voltage mode buck-boost controller cooperates with external temperature sensor provide compensated gate-off voltage supply to the level shifters. While the charge pump controller regulates the external charge pump voltage source to supply for the level shifters.

The level shifters transform the logic-level control sig-nals generated by the display timing controller (TCON) into the high-level signals needed by LCD panel. Each channel of level shifter output uses low impedance tran-sistors to achieve fast rising and falling time, even when driving the capacitive loads present in LCD applications. Channel 1 to 6 supports gate voltage shading. They are organized in two groups, each with its own shading dis-charge resistor output. External R-C timer defines shading period though the DTS input.

The VCOM buffer can drive the LCD VCOM voltage that features high short-circuit current (200mA), fast slew rate (20V/μs), wide bandwidth (8MHz) and rail-to-rail input/output.

The G2521 features extensive protection functions that include UVLO, OCP, UVP, OVP, SCP and OTP. It is available in a TQFN6x6-48L package.

Features
2.6V~5.5V Supply Range
Current Mode Boost Regulator for AVDD
0.1Ω/20V/3A Embedded NMOS switch
Fixed 1.2MHz Switching Frequency
Up to 85% Efficiency
1% Output Regulation
Voltage Mode Buck-Boost Regulator for VGOFF
Fixed 600kHz Switching Frequency
Up to 85% Efficiency
1% Output Regulation
Charge Pump Regulator for VGON
3-Channel Rail-to-Rail Unity-Gain Operational
Amplifier
±200mA Output Short Circuit Current
20V/μs Slew Rate
18MHz, -3dB Bandwidth
Built-In Power On Sequence and Soft Start
Function
7-Channel Level Shifter
+33V Highest Voltage Level
-30V Lowest Voltage Level
Maximum 1μs Rising/Falling Time
300mA Peak Current
15mA Continuous Current
Adjustable Gate Shading Function
Opened Drain Pull High VGLC Signal
Protections:
Input Under Voltage Lockout (UVLO)
Over Current Protection for AVDD (OCP)
Output Under Voltage Protection for AVDD, GON and GOFF (UVP)
Output Over Voltage Protection for AVDD, GON and GOFF (OVP)
Operational Amplifier Short Circuit Protection (SCP)
Over Temperature Protection (OTP)
TQFN6x6-48L Package
RoHS Compliant