AAT1164 Datasheet, PDF (1/24 Pages) Advanced Analog Technology, Inc. – TRIPLE-CHANNEL TFT LCD POWER SOLUTION

Advanced Analog Technology, Inc.
April 2007
AAT1164/AAT1164B/AAT1164C
Product information presented is current as of publication date. Details are subject to change without notice.
TRIPLE-CHANNEL TFT LCD POWER SOLUTION
WITH OPERATIONAL AMPLIFIERS
FEATURES
Built in 3A, 0.2Ω Switching NMOS
Positive LDO Driver Up to 28V/5mA
Negative LDO Driver Down to –14V/5mA
1 V_COM and 4 V_GAMMA Operational Amplifiers
28V High Voltage Switch for VGH
Internal Soft-Start Function
1.2MHz Fixed Switching Frequency
3 Channels Fault and Thermal Protection
Low Dissipation Current
QFN-32 Package Available
PIN CONFIGURATION
GENERAL DESCRIPTION
The AAT1164/AAT1164B/AAT1164C is a triple-channel
TFT LCD power solution that provides a step-up PWM
controller, two high voltage LDO drivers (one for positive
voltage and one for negative voltage), five operational
amplifiers, and one high voltage switch up to 28V for
TFT LCD display.
The PWM controller consists of an on-chip voltage
reference, oscillator, error amplifier, current sense circuit,
comparator, under-voltage lockout protection and
internal soft-start circuit. The thermal and power fault
protection prevents internal circuit being damaged by
excessive power.
The high voltage LDO drivers generate two regulated
output voltage (V_OUT2 and V_OUT3) set by external resistor
dividers. VGH voltage does not activate until DLY voltage
exceeds 1.25V.
The AAT1164/AAT1164B/AAT1164C contains 4+1
operational amplifiers. VO1, VO2, VO4, and VO5 are for
gamma corrections and VO3 is for V_COM. In the short
circuit condition, operational amplifiers are capable of
sourcing ±100mA current for V_GAMMA, and ±200mA
current for V_COM.
With the minimal external components, the
AAT1164/AAT1164B/AAT1164C offers a simple and
economical solution for TFT LCD power.
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– Advanced Analog Technology, Inc. –
Version 1.00
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