ANX6621

ANX6621

应用

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

DESCRIPTION

      The ANX6621 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 a selectable switching frequency of 640k/1.2MHz. The integrated N-channel FET has a typical current limit of 2.0A and can support output voltages up to 16V.

A positive charge pump with an integrated driver can produce up to 40V of positive gate drive.

     The integrated Vcom unity-gain buffer with an adjustable output voltage can sink or source up to 150mA short-circuit current and up to 75mA continuous current.

     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.

     To minimize the inrush current, the soft-start period can be adjusted by an external capacitor.

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

     The ANX6621 is available in a thin 24-pin 4x4 mm VQFN green packa.

FEATURES

2.5V to 5.5V input supply

640k/1.2MHz switching frequency

Current-mode boost regulator

            - Integrated 16V/2.0A 200mΩ FET

            - Fast transient response to pulsed load

            - High efficiency up to 90%

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

            - Adjustable soft-start

            - Over current protection

            - Output under voltage protection

VGH positive charge pump controller

Low-dropout voltage linear regulator

            - Adjustable output voltage (±1.5%)

            - 350mA maximum output current

Unit gain Vcom buffer amplifier

            - 12MHz bandwidth

            - 12V/µs slew rate

            - 150mA output current limit

Low-voltage detection circuit

            - Programmable detecting voltage and delay time

GPM controller with adjustable falling time

            - Flicker compensator

            - Power-on sequence control

Thermal shutdown

Thin 4x4 mm 24-lead VQFN package

          QFN-24 PIN CONFIGURATION
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ORDERING INFORMATION

Part NumberPackage

ANX6621BCQ

VQFN-24L, 4x4

TYPICAL APPLICATION CIRCUIT


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