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AAT1168 Schematic ( PDF Datasheet ) - Advanced Analog Technology

Teilenummer AAT1168
Beschreibung TRIPLE-CHANNEL TFT LCD POWER SOLUTION
Hersteller Advanced Analog Technology
Logo Advanced Analog Technology Logo 




Gesamt 22 Seiten
AAT1168 Datasheet, Funktion
Advanced Analog Technology, Inc.
May 2008
AAT1168/1168A/1168B
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
GENERAL DESCRIPTION
Built in 3A, 0.2Switching NMOS
www.DPaotasSihtieveet4LUD.cOomDriver Up to 28V/5mA
Negative LDO Driver Down to 14V/5mA
1 VCOM and 4 VGAMMA 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
PIN CONFIGURATION
VOUT3 1
VREF 2
GND 3
GND1 4
VO1 5
VI1- 6
VI1+ 7
VO2 8
AAT1168/
AAT1168A/
AAT1168B
24 EO
23 IN1
22 VDD
21 SW
20 VO5
19 VI5-
18 VI5+
17 VO4
The AAT1168/AAT1168A/AAT1168B is a triple-channel
TFT LCD power solution that provides a step-up PWM
controller, two LDO drivers (one for positive high 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 LDO drivers generate two regulated output voltage
set by external resistor dividers. VGH voltage does not
activate until DLY voltage exceeds 1.25V.
The AAT1168/AAT1168A/AAT1168B contains 4+1
operational amplifiers. VO1, VO2, VO4, and VO5 are for
gamma corrections and VO3 is for VCOM . In the short
circuit condition, operational amplifiers are capable of
sourcing ±100mA current for VGAMMA , and ±200mA
current for VCOM .
With the minimal external components, the
AAT1168/A/B offers a simple and economical solution
for TFT LCD power.
台灣類比科技股份有限公司
Advanced Analog Technology, Inc.
Version 1.00
Page 1 of 22






AAT1168 Datasheet, Funktion
Advanced Analog Technology, Inc.
May 2008
AAT1168/1168A/1168B
ELECTRICAL CHARACTERISTICS
( VDD = 2.6V to 5.5V, TC = 40 ° C to 85 ° C , unless otherwise specified. Typical values are tested at 25 ° C ambient
temperature, VDD = 5V, VDD1 = 10V.)
N-MOS Switch (Channel 1)
PARAMETER
Current Limit
On-Resistance
www.LDeaatakSahgeeetC4Uu.rcroemnt
SYMBOL
ILIM
RON
ISWOFF
TEST CONDITION
ISW = 1.0A
VSW = 12V
MIN TYP MAX UNIT
3.0 A
0.2
0.01 20.00 µ A
Negative Charge Pump (Channel 2)
PARAMETER
SYMBOL
IN2 Threshold Voltage
VIN2
IN2 Input Bias Current
IB2
OUT2 Leakage Current
IOFF2
OUT2 Source Current
IOUT2
TEST CONDITIONS
IOUT2 = 100 µ A
VIN2 = 0.25V to 0.25V
VIN2 = 0V, OUT2 = 12V
MIN
235
40
VIN2 = 0.35V, OUT2 = 10V 1
TYP
250
0
20
4
MAX UNIT
265 mV
40 nA
50 µ A
mA
Positive Charge Pump (Channel 3)
PARAMETER
SYMBOL
IN3 Threshold Voltage
VIN3
IN3 Input Bias Current
IB3
OUT3 Leakage Current
IOFF3
OUT3 Sink Current
IOUT3
TEST CONDITIONS
IOUT3 = 100 µ A
VIN3 = 1V to1.5V
VIN3 = 1.4V, OUT3 = 28V
VIN3 = 1.1V, OUT3 = 25V
MIN TYP MAX UNIT
1.22 1.25 1.28 V
40 0
40
40 nA
80 µ A
14
mA
台灣類比科技股份有限公司
Advanced Analog Technology, Inc.
Version 1.00
Page 6 of 22

6 Page









AAT1168 pdf, datenblatt
Advanced Analog Technology, Inc.
May 2008
AAT1168/1168A/1168B
TYPICAL OPERATING CHARACTERISTICS
( VIN = 5V, VOUT1 = 12V, VOUT2 = 7V, VOUT3 = 27V, TC = +25 C , unless otherwise noted.)
www.DataSheet4U.com
台灣類比科技股份有限公司
Advanced Analog Technology, Inc.
Version 1.00
Page 12 of 22

12 Page





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