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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

Pin Configuration

(Top View)
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
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.


Note 1: Please refer to page 13 and 14 for VP3 and
VP2.
(TSSOP-16 Package)

AAT1118/A/B
1
2
3
4
5
6
7
8 9
10
11
12
13
14
15
16PGO
IN1
EO
GND
IN3
IN2
GND1
SW
GND2
/
OUT3
OUT2
SHDN
DDV
DD1VREFV
DD2V CH3V