Advanced Analog Technology, Inc.
AAT1100
Product information presented is current as of publication date. Details are subject to change without notice
TRIPLE-CHANNEL PWM CONTROLLER
Features
Complete PWM Power Control Circuitry
Precision Reference：1.25V±1% (25
o
C)
Low Operating Voltage：2.5V to 7.0V
Under-Voltage Lockout Protection
Totem Pole Output
Output Short Circuit Protection
Low Dissipation Current：
2.5mA at 500 kHz and 50% Duty Cycle
Separate On / Off Control for CH1, CH3 Pair
and CH2 (Refer to Function Table)
Dead Time Control：0 to 100%
Wide Operating Frequency：50 kHz to 1MHz
Minimized External Components
General Description
The AAT1100 provides an integrated triple-channel
pulse-width-modulation (PWM) solution for the
power supply of DC-DC system; this device offers
system engineer the flexibility to custom-make the
power supply circuitry to a specific application.
Each channel contains its own error amplifier,
PWM comparator, dead–time control (DTC) and
output driver. The under-voltage protection,
oscillator, short circuit protection and voltage
reference circuit are common features of the three
channels.
The AAT1100 contains two boost circuits (CH1,
CH3) and a buck-boost circuit (CH2). DTC can be
set to provide 0% to 100% dead-time through a
divider network. Soft-Start can be implemented by
paralleling the DTC resistor with a capacitor. Two
DTC inputs are assigned for CH1, CH3 pair and
CH2 individually, and DTC inputs can be used to
control on / off operation. In addition, this device
can operate from 2.5V to 7.0V supply voltages to
achieve efficient operation in low power system.
With a minimal number of external components, the
AAT1100 offers a simple and cost effective
solution.
Pin Configuration
TOP VIEW
IE2
OE 2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OE3
IE3
IE1
OE 1
OSC
DTC2
DTC13
V
REF
V
DD
OUT2
OUT3
OUT1
GND
SCP
(TSSOP-16 PACKAGE)
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Advanced Analog Technology, Inc.
AAT1100
Function Table
Condition
DTC13 > 0.3V, DTC2 > 0.3V
DTC13 > 0.3V, DTC2 < 0.2V
DTC13 < 0.2V, DTC2 > 0.3V
DTC13 < 0.2V, DTC2 < 0.2V
ON
ON
Output
CH1
”High”
”High”
ON
ON
CH2
”Low”
”Low”
OFF ”High”
OFF ”High”
CH3
ON ”High”
ON ”High”
OFF ”Low”
OFF ”Low”
OFF ”Low”
OFF ”Low”
Pin Description
Pin No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
IE2
OE2
V
DD
OUT2
OUT3
OUT1
GND
SCP
V
REF
DTC13
DTC2
OSC
OE1
IE1
IE3
OE3
I/O
I
I/O
I
O
O
O
Description
Inverting Input Terminal of Error Amplifier 2 (EA2)
Output of Error Amplifier 2 (EA2)
Supply Voltage
Channel 2 Output
Channel 3 Output
Channel 1 Output
Ground
I Short Circuit Protection
O Reference Voltage Output
I Dead-Time Control of Channel 1, 3 (CH1, CH3)
I Dead-Time Control of Channel 2 (CH2)
I Frequency Setting Capacitor & Resistor Input
I/O Output of Error Amplifier 1 (EA1)
I Inverting Input Terminal of Error Amplifier 1 (EA1)
I Inverting Input Terminal of Error Amplifier 3 (EA3)
I/O Output of Error Amplifier 3 (EA3)
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Advanced Analog Technology, Inc.
AAT1100
Absolute Maximum Ratings
Characteristics
Supply Voltage
Input Voltage (IE1, IE2, IE3, DTC13, DTC2)
Symbol
V
DD
V
I
V
O
Value
8
V
DD
V
DD
+0.3
Unit
V
V
Output Voltage
Output Current
CH1, CH3
CH2
Sink ( t
w
≦
2µs
, Duty
≦
10%)
I
O
−
41
/
+
21
−
21
/
+
41
V
mA
mA
mA
o
o
Output Peak Current Source ( t
≦
2µs
, Duty
≦
10%)
w
Operating Temperature Range
Storage Temperature Range
I
opeak
T
C
T
storage
+200
−
200
−
20 to
+
85
−
45 to
+
125
C
C
Recommended Operating Conditions
Supply Voltage, V
DD
Input Voltage, IE1, IE3
Input Voltage, IE2
Output Voltage
Oscillator (OSC) Capacitance
Oscillator (OSC) Resistance (Note 1)
Oscillator (OSC) Frequency
Output Current (CH1, CH3)
Output Current, (CHl, CH2)
Output Current of Error Amplifier 1, 2
and 3 (EA1, EA1, EA3)
Operating Temperature
Symbol
V
DD
V
I13
Min
2.5
Max
7.0
Unit
V
0.95
0.4
0
10
6
50
1.55
1.0
V
DD
1,800
8
1,000
−
40
/
+
20
−
20
/
+
40
V
V
V
pF
k
Ω
kHz
mA
mA
µA
o
V
I 2
V
O
C
OSC
R
OSC
f
OSC
I
O13
I
O2
I
OE
T
C
60
−
20
85
C
Note 1: The rise and fall times of oscillator wave form will be equal at OSC resistor ( R
OSC
) =7 kΩ theoretically.
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Advanced Analog Technology, Inc.
AAT1100
Electrical Characteristics,
V
DD
=
3.3V
;
T
C
= 25
o
C (Unless Otherwise Specified)
Oscillator
Parameter
Test Condition
C
OSC
= 130pF,
R
OSC
= 7
k
Ω
Min
Typ
Max Unit
Oscillator Frequency
Oscillator Output Voltage at
High
Oscillator Output Voltage at
Low
Frequency Change with
V
DD
Frequency Change with
Temperature
Oscillator Output Current
Under-Voltage Protection
Parameter
Upper Threshold Voltage
f
OSC
V
OSCH
V
OSCL
f
∆
V
f
∆
T
I
OSC
400
0.95
0.35
500
1.00
0.40
600
1.05
0.45
kHz
V
V
C
OSC
= 130pF,
R
OSC
= 7
k
Ω
C
OSC
= 130pF,
R
OSC
= 7
k
Ω
V
DD
= 2.5V to 7V,
C
OSC
= 130pF,
R
OSC
= 7
k
Ω
(Note 2)
1
5
−
180
2
10
%
%
µ
A
−
200
−
220
Test Condition
V
UPH
V
UPL
V
HYS
Min
2.2
Typ
2.3
Max Unit
2.4
V
Lower Threshold Voltage
Hysteresis ( V
UPH
– V
UPL
)
Short Circuit Protection Control
Parameter
2.0
0.1
2.1
0.2
2.2
0.3
V
V
Input Threshold Voltage
Latch Reset Threshold
Voltage
Short Circuit Detect
Threshold Voltage
SCP Terminal Source
Current
V
r1
V
r 2
V
R
V
r 3
I
SCP
Test Condition
CH1, CH3
CH2
Min
1.10
0.20
Typ
1.15
0.25
Max Unit
1.20
V
0.30
0.8
1.20
−
1
.
4
1.5
1.25
−
2
.
0
1.8
1.30
−
2
.
6
V
V
µ
A
Note 2: The deviation is defined as the difference between the maximum and minimum values obtained over the
recommended temperature range (-20
o
C to 85
o
C).
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Advanced Analog Technology, Inc.
AAT1100
Electrical Characteristics,
V
DD
= 3.3V;
T
C
= 25
o
C (Unless Otherwise Specified)
(Cont.)
Reference Voltage
Parameter
Reference Voltage
Test Conditions
I
REF
= −
1mA
Min Typ Max Unit
1.237 1.250 1.263 V
−
2
−
10
−
30
Short Circuit Output Current
Input Voltage Regulation
Output Regulation
Reference Voltage Change
with Temperature
EA (Error Amplifier)
Parameter
V
REF
I
OS
V
RI
V
RO
V
R
∆
V
REF
=
0
I
REF
= −
1mA ,
V
DD
= 2.5V to 7V
I
REF
= −
0.1mA to
−
1mA
I
REF
= −
1mA (Note 3)
mA
mV
mV
mV
2
1
15
5
5
25
Input Offset Voltage
Input Bias Current
Input Voltage Range
Open-Loop Voltage Gain
Unity-Gain Bandwidth
V
IO
I
IB
V
IR
A
VO
BW
1
V
OS
+
Test Condition
CH1,CH3, Unity Gain
Min
Typ
Max
Unit
15
±10
±10
0.95
0.4
60
1
±20
±20
1.55
1.0
mV
nA
V
dB
MHz
CH1,CH3, V
I13
= 0.95V
to 1.55V
CH2, V
I 2
= 0.4V to 1.0V
CH1, CH3
CH2
R
OE
= 200
k
Ω
∆
V
I
= +
0
.
1V ,
I
O
= −
60
µ
A
∆
V
I
= −
0
.
1V ,
I
O
=
0.2mA
∆
V
I
= −
0
.
1V ,
V
O
=
0.2V
∆
V
I
= +
0
.
1V ,
V
O
=
1.2V
1.2
V
0.2
0.2
−
60
Output Voltage Swing
V
OS
−
Output Sink Current
Output Source Current
Input Bias Voltage
I
OS
+
I
OS
−
V
r 5
1.0
−
100
mA
µ
A
CH2, Unity Gain,
T
C
= 25
o
C
CH2, Unity Gain
678
665
700
700
722
735
mV
Note 3: The parameter V
R
∆
is defined as the difference between the maximum and minimum values obtained over the
recommended temperature range (-20
o
C to 85
o
C).
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