ANX6621

      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.