AAT1118 DC-DC CONVERTER Datasheet

AAT1118 Datasheet, PDF, Equivalent


Part Number

AAT1118

Description

ADJUSTABLE TRIPLE-CHANNEL TFT LCD DC-DC CONVERTER

Manufacture

Advanced Analog Technology

Total Page 18 Pages
Datasheet
Download AAT1118 Datasheet


AAT1118
Details are subject to change without notice.
AAT1118/A/B
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)
PGO
IN1
EO
VDD
GND
VREF
IN3
IN2
1 16
2 15
3 14
AAT1118/A/B
4 13
5 12
6 11
7 10
89
GND1
SW
GND2
VDD2 / VCH3
OUT3
VDD1
OUT2
SHDN
(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
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.
Page 1 of 18
V 1.0

AAT1118
Pin Description
AAT1118/A/B
PIN NO. NAME I/O
DESCRIPTION
1 PGO O HV Switch Output
2 IN1 I Inverting Input Pin of PWM Error Amplifier
3 EO I Output Pin of PWM Error Amplifier
4 VDD - Power Supply
5 GND - Ground
6 VREF O Reference Voltage Output
7 IN3 I Charge Pump Channel 3 Feedback Input
8 IN2 I Charge Pump Channel 2 Feedback Input
9 SHDN I Shutdown Control Pin; High for Enable
10 OUT2 O Charge Pump Channel 2 Output
11 VDD1 - High Voltage Power Supply
12 OUT3 O Charge Pump Channel 3 Output
13 VDD2 - High Voltage Power Supply
VCH3 O Power Output for Channel 3 (AAT1118B Only)
14 GND2 - Ground
15 SW O Switch Pin
16 GND1 - SW MOS Ground
Page 2 of 18
V 1.0


Features AAT1118/A/B Details are subject to chang e without notice. ADJUSTABLE TRIPLE-CH ANNEL TFT LCD DC-DC CONVERTER Features Built in 1.6A, 0.2 Switching NMOS Fault and Thermal Protection Internal Soft-S tart Function Internal Power Up Sequenc ing Dual Adjustable Charge Pump Output Positive Output to 40V Negative Output to − 40V Power Good Output TSSOP-16 P ackage General Description The AAT1118 /A/B is an adjustable triple-channel TF T LCD DC-DC converter that provides one current mode PWM, one positive charge pump and one negative charge pump. Buil t-in functions include soft-start and p ower up sequencing. When power is turne d on, soft-start avoids inrush current. Power up sequencing feature provides c ompensation 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 prot ection, thermal detect, soft-start, and fault protection circuit..
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