Advanced Analog Technology, Inc.
AAT1101 Series
Details are subject to change without notice
TRIPLE OUTPUT TFT LCD PWM CONTROLLER
Features
Complete PWM Power Control Circuitry
Precision Reference: 1.25V±1% (25
o
C
)
Low Operating Voltage: 2.5V to 6.5V
Under-Voltage Lockout Protection
5V or 3.3V Selectable Over Voltage
Lockout Protection (AAT1101/A only)
AAT1101/AAT1101A/AAT1101C: 500kHz Fixed
AAT1101B: 50k~1MHz Programmable
Internal Power Up Sequence Control
Totem Pole Output
Output Short Circuit Protection
Low Dissipation Current: 2.5mA
(f=500kHz, Duty=50%)
General Description
The
AAT1101
series
provide
an
integrated
triple-channel pulse width modulation (PWM) solution
for the power supply of LCD displays.
These devices
offer system engineers the flexibility to tailor-make the
power supply circuitry for specific applications. Each
channel contains its own error amplifier, PWM
comparator, dead–time control (DTC) and output driver.
The under-voltage protection, over voltage protection,
power sequence control, shutdown control circuit,
oscillator, short circuit protection, and voltage reference
circuits are the common features of the three channels.
The AAT1101 series contain two exclusive boost
circuits at CH1, CH3 and an exclusive buck_boost
circuit at CH2. AAT1101’s Power Up sequence initiates
at CH1 then CH2 and finally CH3. AAT1101A/C’s
Power Up sequence acts in the order of CH2, CH3, and
then CH1.
AAT1101B’s Power Up sequence starts
At the completion of
from CH2, CH1, and then CH3.
SHDN
IE3
IE1
EO 1
PRDS
CHC
OVS (OSC) (NC)
Pin Configuration
TOP VIEW
IE2
PRDB
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
the Power Up sequencing, the SCP pin stays low and
enters the Wait State of short circuit protection. Power
Up sequencing delay and short circuit protection delay
are set by connecting a capacitor to the SCP pin.
Furthermore, these devices can operate with supply
voltage ranging from 2.5V to 6.5V and function
efficiently in an environment with low power supply.
With a minimum number of external components, the
AAT1101 series offer a simple and cost effective
solution for TFT LCD.
V
DD
OUT2
OUT3
OUT1
GND
SCP
V
REF
(TSSOP-16 PACKAGE)
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–
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Advanced Analog Technology, Inc.
AAT1101 Series
Pin Description
Pin # Name I/O
Description
1
IE2
I Inverted Input of Error Amplifier 2 (EA2)
2
PRDB O Power Ready Output
3
I Supply Voltage
V
DD
4
OUT2 O Channel 2 (CH2) Output
5
OUT3 O Channel 3 (CH3) Output
6
OUT1 O Channel 1 (CH1) Output
7
GND
Ground
8
SCP
I Short Circuit Protection
9
V
REF
O Reference Voltage Output
10*
OVS I/O 3.3V or 5.0V Over Voltage Selection and Over Voltage Output
10** OSC I/O Frequency Setting Capacitor & Resistor Input
10*** NC
NC
11
CHC O Channel Control
12
PRDS I Power Ready Set
13
EO1 I/O Feedback Input of Error Amplifier 1 (EA1)
14
IE1
I Inverted Input of Error Amplifier 1 (EA1)
15
IE3
I Inverted Input of Error Amplifier 3 (EA3)
16
SHDN I Shutdown Control
*：AAT1101A
only
**：AAT1101B only
***：AAT1101C only
Absolute Maximum Ratings
CHARACTERISTICS
Supply Voltage
Input Voltage (
IE
−
)
Output Voltage
CH1, CH3
Output Current
CH2
Sink ( t
w
≦2
µ
s
, Duty≦10%)
Output Peak Current Source ( t
≦2
µ
s
, Duty≦10%)
w
Operating Free-Air Temperature Range
Storage Temperature Range
I
O
SYMBOL
V
DD
V
I
V
O
VALUE
8
V
DD
V
DD
+0.3
−
41
/+21
−
21
/+41
UNIT
V
V
V
mA
mA
mA
o
o
I
opeak
T
C
T
storage
+200
−
200
−
20
to +85
−
45
to +125
C
C
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Advanced Analog Technology, Inc.
AAT1101 Series
Electrical Characteristics,
V
DD
= 3.3V (Unless Otherwise Specified) (Cont.)
Under Voltage (UV) and Over Voltage (OV) Protection
Parameter
Test Condition
Min
Typ
Max
Unit
UV Upper Threshold
Voltage
UV Lower Threshold
Voltage
UV Hysteresis ( V
UPH
– V
UPL
)
OV 3.3V Threshold
Voltage**
OV 5V Threshold
Voltage**
V
UPH
V
UPL
V
HYS
V
OP33
V
OP5
T
C
= 25
o
C, AAT1101/A/B
T
C
= 25
o
C, AAT1101C
T
C
= 25
o
C, AAT1101/A/B
T
C
= 25
o
C, AAT1101C
T
C
= 25
o
C, AAT1101/A/B
T
C
= 25
o
C, AAT1101C
T
C
= 25
o
C
T
C
= 25
o
C, OVS connects a
56
k
Ω
resistor to
V
DD
2.1
2.0
1.9
1.7
0.1
0.18
3.8
5.7
2.3
2.2
2.1
1.87
0.2
0.33
4.1
6.1
2.5
2.4
2.3
2.05
0.3
0.48
4.4
6.5
V
V
V
V
V
V
V
V
**: AAT1101/AAT1101A only
Shutdown Control
Parameter
Test Condition
Min
Typ
Max
Unit
Shutdown Release Input Voltage
Shutdown Enable Input Voltage
Short Circuit Protection Control
Parameter
Test Condition
2.0
-
-
-
-
0.5
V
V
Min
Typ
Max
Unit
Input Threshold Voltage
Latch Reset Voltage by V
DD
Latch Reset Voltage by
SHDN
V
r1
V
r1
V
r 2
V
R _ VDD
CH1 (EO1)
CH3 (IE3)
CH2 (IE2)
T
C
= 25
o
C
1.10
1.20
0.67
0.8
-
1.20
−
2 .6
1.15
1.25
0.70
1.5
-
1.25
−
2 .0
1.20
1.30
0.73
1.8
0.5
1.30
−
1 .4
V
V
V
V
V
V
µ
A
o
V
R _ SHDN
T
C
= 25 C
Short-Circuit Detection
Threshold Voltage
SCP Terminal Source
Current
V
r 3
I
SCP
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