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Portable equipment


      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.


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


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Part NumberPackage


VQFN-24L, 4x4



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