GENERAL DESCRIPTION

The ADD8733 is a 4-channel regulator with two VCOM amplifiers and gate pulse modulation (GPM) that provides all the necessary voltages for thin film transistor (TFT) liquid crystal displays (LCD). Included is a step-up regulator, a stepdown regulator for digital logic, two VCOM amplifiers, two charge-pump regulators for VGH and VGL, and an integrated gate pulse modulator.

FEATURES

Step-up switching regulator with 3 A switch current limit

8 V to 16.5 V input voltage range

Adjustable output voltage up to 20 V

1.2 A series switch for power sequencing

Overvoltage protection (OVP)

Step-down switching regulator with 3 A switch current limit

8 V to 16.5 V input voltage range

Adjustable output voltage down to 2.5 V

Gate pulse modulator circuitry

Independently adjustable delay and falling slope

Positive charge-pump regulator for VGH

Negative charge-pump regulator for VGL

Two VCOM amplifiers

General

Power supply sequencing

Thermal fault protection

650 kHz or 1.2 MHz PWM frequency

Soft start

Undervoltage lockout (UVLO)

48-lead RoHS compliant LFCSP

APPLICATIONS

TFT LCD panels for TVs and monitors