AAT1168-Q5-T AAT [Advanced Analog Technology, Inc.], AAT1168-Q5-T Datasheet

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AAT1168-Q5-T

Manufacturer Part Number
AAT1168-Q5-T
Description
TRIPLE-CHANNEL TFT LCD POWER SOLUTION WITH OPERATIONAL AMPLIFIERS
Manufacturer
AAT [Advanced Analog Technology, Inc.]
Datasheet
FEATURES
PIN CONFIGURATION
VOUT3
Product information presented is current as of publication date. Details are subject to change without notice.
VREF
GND1
GND
VI1-
VI1+
VO1
VO2
Built in 3A, 0.2
Positive LDO Driver Up to 28V/5mA
Negative LDO Driver Down to 14V/5mA
1
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
V
COM
1
2
3
8
4
5
6
7
and 4
V
AAT1168A/
AAT1168B
GAMMA
AAT1168/
TRIPLE-CHANNEL TFT LCD POWER SOLUTION
Switching NMOS
Advanced Analog Technology, Inc.
Operational Amplifiers
Advanced Analog Technology, Inc. –
24
23
22
21
19
18
17
20
台 灣 類 比 科 技 股 份 有 限 公 司
WITH OPERATIONAL AMPLIFIERS
VDD
EO
IN1
SW
VO5
VI5-
VI5+
VO4
Version 1.00
Page 1 of 22
GENERAL DESCRIPTION
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,
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
operational amplifiers. VO1, VO2, VO4, and VO5 are for
gamma corrections and VO3 is for
circuit condition, operational amplifiers are capable of
sourcing
current for
With
AAT1168/A/B offers a simple and economical solution
for TFT LCD power.
AAT1168/AAT1168A/AAT1168B
the
V
100
COM
under-voltage
minimal
mA
.
AAT1168/1168A/1168B
current for
external
lockout
V
GAMMA
V
components,
COM
, and
protection
contains
. In the short
May 2008
200
mA
4+1
and
the

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AAT1168-Q5-T Summary of contents

Page 1

... VDD 22 current for V COM SW 21 With the VO5 20 AAT1168/A/B offers a simple and economical solution VI5- 19 for TFT LCD power. VI5+ 18 VO4 17 台 灣 類 比 科 技 股 份 有 限 公 司 – – Advanced Analog Technology, Inc. – ...

Page 2

... T: Tape 5*5 and Reel – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc. – – Version 1.00 Page AAT1168/1168A/1168B MARKING MARKING DESCRIPTION Device Type AAT1168 Lot no.(6~9digits) XXXXX Date Code XXXX (4digits) ...

Page 3

... VDD1 SW to GND (for AAT1168A) , VOUT3 OUT3, VGH to GND (for AAT1168/AAT1168B) , VOUT3 OUT3, VGH to GND (for AAT1168A) , OUT2 to GND Input Voltage 1 (IN1, IN2, IN3, DLY, CTL) Input Voltage 2 (VI1+, VI1 , VI2+, VI2 , VI3+, VI3 , VI4+, VI4 , VI5+, VI5 ) Output Voltage 1 (EO, ...

Page 4

... 0~100 REF SYMBOL TEST CONDITION f OSC D MAX – 台 灣 類 比 科 技 股 份 有 限 公 司 – Advanced Analog Technology, Inc. – – Version 1.00 Page May 2008 AAT1168/1168A/1168B MIN TYP MAX 2.6 5 2.1 2.2 2.3 2.3 2.4 2.5 0.56 0.80 5.60 10 ...

Page 5

... IN2 Fault Protection Voltage IN3 Fault Protection Voltage Error Amplifier (Channel 1) PARAMETER Feedback Voltage Input Bias Current Feedback-Voltage Line Regulation Transconductance Voltage Gain SYMBOL TEST CONDITION t SS1 t SS2 t SS3 t AAT1168A Only D12 t AAT1168A Only D23 AAT1168/AAT1168B t FP AAT1168A AAT1168/AAT1168B V F1 AAT1168A SYMBOL ...

Page 6

... IN3 1.1V, OUT3 = 25V OUT3 IN3 – 台 灣 類 比 科 技 股 份 有 限 公 司 – Advanced Analog Technology, Inc. – – Version 1.00 Page May 2008 AAT1168/1168A/1168B MIN TYP MAX 3.0 0.2 0.01 20.00 MIN TYP MAX 235 250 265 ...

Page 7

... ONSC DLY CTL 1.5V, V ONDC DLY CTL – 台 灣 類 比 科 技 股 份 有 限 公 司 – Advanced Analog Technology, Inc. – – Version 1.00 Page AAT1168/1168A/1168B MIN TYP MAX –4 –5 –6 1.22 1.25 1. –40 100 ...

Page 8

... unless otherwise specified. Typical values are tested ambient DD C temperature 5V 10V.) DD DD1 V and V Buffer COM GAMMA PARAMETER Input Offset Voltage Input Bias Current Output Swing (for AAT1168) Short Circuit Current Slew Rate Settling Time SYMBOL TEST CONDITIONS VI1 VI5 I V ...

Page 9

... Positive Charge Pump Feedback Pin Positive Charge Pump Output Negative Charge Pump Feedback Pin – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc. – – Version 1.00 Page AAT1168/1168A/1168B DESCRIPTION – May 2008 ...

Page 10

... High Voltage Switch Control Pin Gate High Voltage Fall Time Setting Pin Switching Gate High Voltage for TFT – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc. – – Version 1.00 Page AAT1168/1168A/1168B DESCRIPTION – May 2008 ...

Page 11

... Advanced Analog Technology, Inc. TYPICAL APPLICATION CIRCUIT AAT1168/A/B Figure 1. Typical Application Circuit – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc. – – Version 1.00 Page AAT1168/1168A/1168B – May 2008 ...

Page 12

... Advanced Analog Technology, Inc TYPICAL OPERATING CHARACTERISTICS ( 12V −7V, IN OUT1 OUT2 V = 27V + unless otherwise noted.) OUT3 C 台 灣 類 比 科 技 股 份 有 限 公 司 – – Advanced Analog Technology, Inc. – – Version 1.00 Page May 2008 AAT1168/1168A/1168B ...

Page 13

... Advanced Analog Technology, Inc TYPICAL OPERATING CHARACTERISTICS ( 12V −7V, IN OUT1 OUT2 V = 27V + unless otherwise noted.) OUT3 C 台 灣 類 比 科 技 股 份 有 限 公 司 – – Advanced Analog Technology, Inc. – – Version 1.00 Page May 2008 AAT1168/1168A/1168B ...

Page 14

... Switching frequency 51k and : Duty cycle D I LPEAK : Input DC current I IN The AAT1168 SW current limit ( saturation current rating ( and the inductor's DC current rating should exceed For the best efficiency, choose an inductor with less DC series resistance ( I LIM I > LDC peak ...

Page 15

... RIPPLE V RIPPLE V RIPPLE 台 灣 類 比 科 技 股 份 有 限 公 司 – Advanced Analog Technology, Inc. – – Version 1.00 Page AAT1168/1168A/1168B ceramic capacitor can reduce the r C ripple and power loss. There are two ...

Page 16

... The duty to inductor current transfer function Where 台 灣 類 比 科 技 股 份 有 限 公 司 – Advanced Analog Technology, Inc . – – Version 1.00 Page AAT1168/1168A/1168B )( esr ...

Page 17

... T , and f is the clock switching pi s frequency; is the current-sense R CS transresistance. For the boost converter and − For AAT1168, = 0.24 V/ compensation 0.8×10 a The closed-current loop transfer function ( 12f icl ( ( ) ...

Page 18

... ® 台 灣 類 比 科 技 股 份 有 限 公 司 – Advanced Analog Technology, Inc . – – Version 1.00 Page AAT1168/1168A/1168B (Figure 8) between 10k 6 . And calculate R with the following equation. 5   Vout 3    ...

Page 19

... BAT54S (Figure 8 and 9) has fast recovery time and low forward voltage for best efficiency. LDO Driver Base-Emitter Resistors For AAT1168, the minimum drive current for positive and negative LDO driver are 1mA, thus the minimum base-emitter resistance can be calculated by the ...

Page 20

... Advanced Analog Technology, Inc Operational Amplifier The AAT1168 have five amplifiers independent. The operational amplifiers are usually used to drive V and the gamma correction divider string for TFT-LCD. The output resistors and capacitors of amplifiers are as low pass filter and compensator for unity GAIN stable. ...

Page 21

... PC Board Layout 台 灣 類 比 科 技 股 份 有 限 公 司 – – Advanced Analog Technology, Inc . – – Version 1.00 Page May 2008 AAT1168/1168A/1168B ...

Page 22

... TYP MAX 0.9 1.0 0.02 0.05 0.25 0.30 0.2 ------ 5.0 5.1 3.10 3.15 5.0 5.1 3.10 3.15 0.5 ------ 0.40 0.45 ------ 0.075 台 灣 類 比 科 技 股 份 有 限 公 司 – – Advanced Analog Technology, Inc . – – Version 1.00 Page AAT1168/1168A/1168B May 2008 ...

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