ANX6621数据手册HYSiC中文资料规格书

描述 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.

特性 Features

• 2.5V to 5.5V input supply\r
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• 640k/1.2MHz switching frequency\r
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• Current-mode boost regulator\r
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- Integrated 16V/2.0A 200mΩ FET\r
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- Fast transient response to pulsed load\r
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- High efficiency up to 90%\r
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- Adjustable high-accuracy output voltage (±1%)\r
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- Adjustable soft-start\r
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- Over current protection\r
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- Output under voltage protection\r
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• VGH positive charge pump controller\r
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• Low-dropout voltage linear regulator\r
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- Adjustable output voltage (±1.5%)\r
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- 350mA maximum output current\r
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• Unit gain Vcom buffer amplifier\r
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- 12MHz bandwidth\r
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- 12V/µs slew rate\r
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- 150mA output current limit\r
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• Low-voltage detection circuit\r
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- Programmable detecting voltage and delay time\r
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• GPM controller with adjustable falling time\r
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- Flicker compensator\r
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- Power-on sequence control\r
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• Thermal shutdown\r
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• Thin 4x4 mm 24-lead VQFN package

应用 Application

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