Advanced Analog Technology, Inc.
AAT1118
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 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
could switch on or off TFT gate.
With the minimal external components, the
AAT1118 offers a simple and economical solution
for TFT LCD power.
Pin Configuration
(Top View)
(TSSOP-16 Package)
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Advanced Analog Technology, Inc
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