ANX6732

ANX6732

应用

TFT LCD for Notebooks
TFT LCD for Monitors
Car Navigation Display
Portable equipment

DESCRIPTION

     The ANX6732 is an integrated power supply solution optimized for small to medium size thin-film transistor (TFT) liquid crystal displays (LCD’s).

The boost converter operates at the frequency of 1.2MHz. The integrated N-channel FET has a typical current limit of 3.0A and can support output voltages up to 20V.

     The gate-on and gate-off charge pumps provide regulated TFT-LCD gate-on and gate-off supplies. Both outputs can be adjusted by external resistive voltage-dividers.

     The GPM is a flicker compensation circuit to reduce the coupling effect of gate lines; the gate-shaping timing is controlled by the timing-controller to modulate the Gate-On voltage, VGHM. It also can delay the Gate-On voltage during power-on to achieve a correct power-on sequence for gate driver ICs. Both the power-on delay time and the falling time of the Gate-On voltage are programmable by external capacitor and resistor.

     The integrated operational amplifier is typically used for LCD Vcom driving; the output can sink or source up to 350mA short-circuit current. This operational amplifier features fast slew rate (40V/us), wide bandwidth (20MHz), and rail-to-rail outputs as well.

     A built-in voltage detector generates a reset signal when the input voltage drops below a specified level. The reset signal is active low, and the detecting level is decided by an external resistor divider.

     The ANX6732 is available in a thin 24-pin 4x4 mm VQFN green package.

FEATURES

2.5V to 5.5V input supply

Current-mode boost regulator

- 1.2MHz switching frequency

- Integrated 20V/3.0A 160mΩ FET

- Fast transient response to pulsed load

- High efficiency up to 90%

- Adjustable high-accuracy output voltage (±1%)

- Over current protection

- Over voltage protection

VGH positive charge pump controller

VGL negative charge pump controller

Integrated high performance operational amplifier

- ±350mA output short-circuit current

- 40V/us fast slew rate

- 20MHz Bandwidth

- rail-to-rail output

Low-voltage detection circuit

GPM controller 

- Adjustable falling time

- Adjustable delay

Thermal shutdown

Thin 4x4 mm 24-lead VQFN package 


QFN-24 PIN CONFIGURATION

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TYPICAL APPLICATION CIRCUIT
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