AAT1118/A/B
Details are subject to change without notice.
ADJUSTABLE TRIPLE-CHANNEL TFT LCD
DC-DC CONVERTER
Features
Built in 1.6A, 0.2 Switching NMOS
Fault and Thermal Protection
Internal Soft-Start Function
Internal Power Up Sequencing
Dual Adjustable Charge Pump Output
Positive Output to 40V
Negative Output to
−
40V
Power Good Output
TSSOP-16 Package
General Description
The AAT1118/A/B is an adjustable triple-channel
TFT LCD DC-DC converter that provides one
current mode PWM, one positive charge pump and
one negative charge pump. Built-in functions
include soft-start and power up sequencing. When
power is turned on, soft-start avoids inrush current.
Power
up
sequencing
feature
provides
compensation for LCD panel to maintain a smooth
voltage during a turn-on cycle.
The DC-DC converter consists of an on-chip
voltage reference, error amplifier, current sense,
pulse width modulation controller, under-voltage
lockout protection, thermal detect, soft-start, and
fault protection circuit.
When the two charge pumps are in operation, the
GND1
SW
GND2
Pin Configuration
(Top View)
PGO
IN1
EO
1
2
3
4
5
6
7
8
16
15
output voltage would be doubled and the generated
VP3 and VP2 (Note 1) could switch on or off TFT
gate.
With the minimal external components, the
AAT1118/A/B offers a simple and economical
solution for TFT LCD power.
V
DD
GND
AAT1118/A/B
14
13
12
11
10
9
V
DD2
/
V
CH3
OUT3
V
REF
IN3
IN2
V
DD1
OUT2
SHDN
Note 1: Please refer to page 13 and 14 for VP3 and
VP2.
(TSSOP-16 Package)
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AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
