AAT1212数据手册AAT中文资料规格书

描述 Description

The AAT1212 is a single-chip solution for TFT LCD panel application. It contains multi-channel TFT LCD power solution that provides a boost PWM regulator, positive charge pump, VCOM operational amplifier, voltage detector, low dropout linear regulator, GPM controller up to 35V for TFT LCD display, and WLED backlight driver.


The LED driver can drive 4 strings of WLEDs using constant current sinks. The mismatch current of every string is within 3%.


The PWM controller consists of an on-chip voltage reference, oscillator, error amplifier, current sense circuit, comparator, under-voltage lockout protection, and soft-start control circuit. The thermal and power fault protection prevents excessive power from damaging the internal circuit.


The positive charge pump generates VGH voltage (gate high voltage) which can be set by an external resistor divider. For flicker compensation, VGHM is connected to VGH when VFLK is low and connected to RE when VFLK is high. In addition, AAT1212 contains one operational amplifier capable of supplying 150mA to VCOM.


With minimal external components, the AAT1212 offers a simple and economical solution for TFT LCD and backlight power management.

特性 Features

• WLED Current up to 60mA per String
• PWM Dimming Control from 100Hz to 20kHz
• LED Power Sequence Control Free
• Boost Output Voltage Adjustable up to 16V
• Programmable Soft-Start
• Fault and Thermal Protection
• Up to 350mA LDO
• 35V High Voltage Switch for VGHM
• Positive Charge Pump for Gate-High Supply
• 640kHz/1.2MHz Switching Frequency for AVDD
• 600kHz to 2MHz Switching Frequency for LED
• VCOM Operational Amplifier
• Reset Signal Output for TCON
• VQFN 40L-5mm x 5mm Package

应用 Application

• TFT LCD Panel