Advanced Analog Technology, Inc.
Advanced Analog Technology, Inc
.
Page 1 of 14 V 1.0
AAT1160
Product information presented is current as of publication date. Details are subject to change without notice.
Step Up Current Mode PWM Converter with
4+1 Operational Amplifiers
Features
Built in 1.6A, 0.23 Switching NMOS
Fault and Thermal Protection
Internal Soft-Start Function
Selectable Frequency600 kHz or 1.25MHz
Low Dissipation Current :
Typical
1.6mA
in Operation
Four Channels
GAMMA
V
with Output Current:
+30mA
(MAX)
One channel
COM
V
with Output Current:
+100mA (MAX)
TSSOP-20 Package Available
Pin Configuration
(Top View)
General Description
The AAT1160 is a step up current mode PWM
converter that provides a one-channel step-up PWM
controller, four Gamma buffers, and one
COM
V
buffer. Internal soft-start function can efficiently
prevent inrush current when the power is on.
This PWM controller 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 circuits.
The AAT1160 contains 4+1 operational amplifiers:
GO1, GO2, GO3, and GO4 for gamma corrections
and COUT for
COM
V
.
COM
V
and
GAMMA
V
are designed to increase
driving capability for thin film transistor liquid
crystal display (TFT LCD). Each buffer is capable
of driving heavy load and offering fast current
loading (
COM
V
:
mA
100
, and
GAMMA
V
:
mA
30
).
With minimal external components, the AAT1160
offers a simple and economical power management
solution for TFT LCD panels.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
SW
SHDN
FREQ
CIN+
GI1
GI2
GI3
GI4
GND1
GND
IN1
EO
N.C
COUT
GO1
GO2
GO3
GO4
AAT1160
TSSOP-20 PACKAGE
DD
V
DD1
V
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
SW
SHDN
FREQ
CIN+
GI1
GI2
GI3
GI4
GND1
GND
IN1
EO
N.C
COUT
GO1
GO2
GO3
GO4
AAT1160
TSSOP-20 PACKAGE
DD
V
DD1
V
Advanced Analog Technology, Inc.
Advanced Analog Technology, Inc
.
Page 2 of 14 V 1.0
AAT1160
Pin Description
PIN
NO.
NAME I/O
DESCRIPTION
1
SW
O High Voltage Switch Output
2
DD
V
- Power
Supply
3 SHDN
I
Shutdown
Control
Pin; High for Enable
4
FREQ
I Frequency Select Pin
5
DD1
V
- High Voltage Power Supply
6
CIN+ I
COM
V
Buffer Input
7
GI1
I Gamma Buffer 1 Input
8
GI2
I Gamma Buffer 2 Input
9
GI3
I Gamma Buffer 3 Input
10
GI4
I Gamma Buffer 4 Input
11
GO4
O Gamma Buffer 4 Output
12
GO3
O Gamma Buffer 3 Output
13
GO2
O Gamma Buffer 2 Output
14
GO1
O Gamma Buffer 1 Output
15
COUT O
COM
V
Buffer Output
16 N.C -
17
EO
O PWM Error Amplifier Output Pin
18
IN1
I Inverting Input Pin of PWM Error Amplifier
19
GND -
Ground
20 GND1 -
Ground
Advanced Analog Technology, Inc.
Advanced Analog Technology, Inc
.
Page 3 of 14 V 1.0
AAT1160
Absolute Maximum Ratings
PARAMETER SYMBOL
VALUE
UNIT
DD
V to GND
DD
V
7 V
SW to GND
SW
V
18 V
DD1
V
to GND
DD1
V
14 V
Input Voltage 1 (IN1, SHDN, FREQ)
I1
V
DD
V +0.3
V
Input Voltage 2 (CIN+, CI1, CI2, GI3, GI4)
I2
V
DD1
V
+0.3
V
Output Voltage 1 (EO)
O1
V
DD
V +0.3
V
Output Voltage 2 (COUT, GO1, GO2, GO3,
GO4, SW)
O2
V
DD1
V
+0.3
V
Operating Free-Air Temperature Range
C
T
20
-
to
85
+
C
Storage Temperature Range
DD1
T
45
-
to
125
+
C
Power Dissipation
P
d
700
mW
Advanced Analog Technology, Inc.
Advanced Analog Technology, Inc
.
Page 4 of 14 V 1.0
AAT1160
Electrical Characteristics, V
DD
= 3V, FREQ=GND, V
DD1
= 10V
Operating Power
PARAMETER
SYMBOL
TEST CONDITION
MIN TYP MAX UNIT
Input Supply Voltage Range
DD
V
2.6
5.5
V
Falling 2.29
2.43
2.57
V
VDD Under Voltage Lockout
UVLO
V
Rising
2.58
V
IN1
V =1.3V, not switching
0.36
0.60
mA
Quiescent Current
VDD
I
IN1
V =1.1V, switching
1.2
5.0
mA
Shutdown Current
SHDN
I
SHDN
V
=GND
0.1
10.0
A
Thermal Shutdown
SHDN
T
160 C
EA (Error Amplifier)
PARAMETER
SYMBOL
TEST CONDITION
MIN TYP MAX UNIT
Feedback Voltage
IN1
V
Level to produce
V
EO
=1.265V
1.247 1.265 1.283
V
Input Bias Current
1
B
I
IN1
V =1.265V
0 40
nA
Feedback-Voltage Line
Regulation
V
RI
Level to produce
V
EO
=1.265V
2.6V < V
DD
< 5.5V
0.05
0.15
%
/V
Transconductance
m
g
I=5
A
70 105 240
A
/V
Voltage Gain
V
A
1,500 V
/V
Fault Detect Trigger Voltage
0.98
1.02 1.06
V
Oscillator
PARAMETER
SYMBOL
TEST CONDITION
MIN TYP MAX UNIT
FREQ=GND 500
600
700
kHz
Oscillation Frequency
OSC
f
FREQ=
DD
V
900
1250 1500
kHz
FREQ=GND
79 85 92
%
Maximum Duty Cycle
MAX
D
FREQ=
DD
V
85
%
Advanced Analog Technology, Inc.
Advanced Analog Technology, Inc
.
Page 5 of 14 V 1.0
AAT1160
Electrical Characteristics, V
DD
= 3V, FREQ=GND, V
DD1
= 10V
N-CHANNEL SWITCH
PARAMETER SYMBOL
TEST CONDITION
MIN
TYP MAX UNIT
Current Limit
LIM
I
IN1
V
=1.1V,
1.1 1.6 2.1 A
On-Resistance
ON
R
SW
I =1.2A
0.28
0.50
Leakage Current
SWOFF
I
SW
V =12V
0.01
20.00
A
Soft Start & Fault Detect Time
PARAMETER SYMBOL
TEST
CONDITION
MIN
TYP
MAX UNIT
Soft Start Time
SS
t
14
ms
During Fault Protect Trigger
Time
FS
t
55
ms
Control Inputs Characteristics
PARAMETER SYMBOL
TEST
CONDITION
MIN
TYP
MAX UNIT
Input Low Voltage
IL
V
0.3
DD
V
V
Input High Voltage
IH
V
0.7
DD
V
V
Hysteresis
HYS
V
0.1
DD
V
V
FREQ Pull Down Current
PL
I
3.5 5.0 6.5
A
SHDN Pull Up Current
PH
I
0.001
1.000
A
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