FEATURES

● Built In 2A (Max.), 0.2Ω Switching NMOS

● Negative LDO Driver Down to –14V/+20mA

● VCOM Operational Amplifier

● Up to 350mA LDO

● Reset Signal Output for TCOM

● 28V High Voltage Switch for VGH

● Adjustable Soft-Start Function

● 1.2MHz Fixed Switching Frequency

● Fault and Thermal Protection

● Low Dissipation Current :

Typical 2.3mA In Operation

VQFN24-4*4 Package Available

GENERAL DESCRIPTION

The AAT11671 provides a step-up PWM controller,

negative high voltage LDO drivers, low dropout linear

regulator, VCOM operational amplifier and one high

voltage switch (up to 28V) for TFT LCD display. RST pin

will issue a reset signal to TCOM when VDD voltage is too

low. 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 damaging internal

circuit. The negative high voltage LDO drivers generate

VOUT2 voltage (VGL) setting by external resistor divider.

For the flicker compensation, VGH will be connected to

VOUT3 when CTL is high and connected to ADJ when

CTL goes low. The AAT11671 contains one operational

amplifier capable of supplying 200mA to VCOM.

With the minimal external components, the AAT11671

offers a simple and economical solution for TFT LCD