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, 0.2
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
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.
PIN CONFIGURATION
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Advanced Analog Technology, Inc. –
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