Advanced Analog Technology, Inc.
AAT1105A
Details are subject to change without notice.
BUCK_BOOST & BOOST PWM CONTROLLER
Features
Complete PWM Power Control Circuitry
CH1: Buck_Boost, CH2: Boost
Under-Voltage Lockout (UVLO) Protection
Totem Pole Output
Output Short Circuit Protection
Dead-Time Control：0% to 100%
Wide Operating Frequency：
10kHz to 800kHz
Shutdown Control
Power Good Protection
General Description
The AAT1105A provides an integrated two-channel
pulse-width-modulation (PWM) solution for the
power supply of DC-DC system. This device
offers 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,
oscillator, short circuit protection (SCP) and voltage
reference circuit are the common features for the
two channels.
The AAT1105A contains one step-up (boost) circuit
at channel two (CH2) and one inverting
(buck_boost) circuit at channel one (CH1).
Dead-time control can be set to provide 0% to
100% dead-time through a resistive divider network.
Soft-start can be implemented by paralleling the
DTC resistor with a capacitor. Two dead-time
control inputs are assigned for CH1 and CH2
individually, and dead-time control inputs can be
used to control on / off operation.
The compact design and optimized external parts of
AAT1105A offers a simple and effective solution.
V
DD
Range: 2.6V~6.5V
Pin Configuration
TOP VIEW
C
t
R
t
SHDN
IE1
OE1
DTC1
OUT1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
REF
SCP
PGO
IE2
OE2
DTC2
OUT2
V
DD
(TSSOP-16 PACKAGE)
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Advanced Analog Technology, Inc.
AAT1105A
Pin Description
Pin No
Name
C
t
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
R
t
SHDN
IE1
OE1
DTC1
OUT1
GND
V
DD
OUT2
DTC2
OE2
IE2
PGO
SCP
V
REF
I/O
Description
- External Timing Capacitance
- External Timing Resistance
I
I
O
I
O
-
-
O
I
O
I
O
-
O
Shutdown Input Pin
（
Internal Pull "H"
）
Inverting Input of Error Amplifier 1
Output for Error Amplifier 1
Output 1 Dead-Time / Soft-Start Setting
Output 1
Ground
Power Supply
Output 2
Output 2 Dead-Time / Soft-Start Setting
Output of Error Amplifier 2
Inverting Input of Error Amplifier 2
Power Good Output Pin
Timer Latch Setting
Reference Voltage (1.293V) Output
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Advanced Analog Technology, Inc.
AAT1105A
Absolute Maximum Ratings
CHARACTERISTICS
Supply Voltage
Input Voltage (
IE
−
, DTC, SHDN)
Output Voltage
Output Current
Operating Free-Air Temperature Range
Storage Temperature Range
Power Dissipation
SYMBOL
V
DD
V
I
V
O
I
O
T
C
T
storage
VALUE
7
V
DD
V
DD
+0.3
−
120
/+120
−
20
to +85
−
45
to +125
UNIT
V
V
V
mA
o
o
C
C
P
d
500
mW
Recommended Operating Conditions
Supply Voltage, V
DD
Input Voltage, IE1, IE2
Output Voltage
Oscillator (OSC) Capacitance
Oscillator (OSC) Resistance
Oscillator (OSC) Frequency
Output Current, I
out1
, I
out 2
Operating Free-Air Temperature
Symbol
V
DD
V
cm
V
O
C
OSC
R
OSC
f
OSC
I
O
T
C
Min
2.6
0.3
0
100
3
10
−
20
Max
6.5
1.5
V
DD
15,000
50
800
+50/
−
50
85
Unit
V
V
V
pF
k
Ω
kHz
mA
o
C
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Advanced Analog Technology, Inc.
AAT1105A
Electrical Characteristics, V
DD
= 3.3V (Unless Otherwise Specified) (See Note 1)
Oscillator
Parameter
Test Condition
Min Typ
C
OSC
= 220pF, R
OSC
=
f
OSC
320
400
Frequency
5.6k
Ω
V
DD
= 2.6V to 6.0V,
T
C
= 25
o
C
Frequency Changes with
f
∆
V
-
1
V
DD
C
OSC
= 220pF,
R
OSC
= 5.6k
Ω
Under-Voltage Protection
Parameter
Test Condition
Min
Typ
Max
Unit
Max Unit
480
kHz
-
%
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis ( V
UPH
– V
UPL
)
V
UPH
V
UPL
V
HYS
T
C
= 25
o
C
T
C
= 25
o
C
T
C
= 25
o
C
1.81
1.57
-
2.03
1.79
0.24
2.25
2.01
-
V
V
V
Short Circuit Protection Control
Parameter
Test Condition
Min
Typ
Max
Unit
Input Threshold Voltage
Input Threshold Voltage
Short-Circuit Detect
Threshold Voltage
SCP Terminal Source
Current
Stand-by Voltage
Latch Voltage
V
r 2
V
r1
V
tscd
I
SCP
V
STB
V
LT
CH2
CH1
1.81
0.30
0.76
−
3 .8
1.29
0.37
0.85
−
2 .6
1.40
0.44
0.94
−
1 .4
V
V
V
µA
mV
mV
50
30
100
100
Shutdown Control
Parameter
Test Condition
Min
Typ
Max
Unit
Shutdown Enable Voltage
Shutdown Release Voltage
V
SE
V
SR
T
C
= 25
o
C
T
C
= 25
o
C
-
2.0
-
-
0.5
-
V
V
Note 1: Typical values of all parameters are specified at
T
C
=25
o
C.
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Advanced Analog Technology, Inc.
AAT1105A
Electrical Characteristics,
V
DD
= 3.3V (Unless Otherwise Specified) (See Note 1) (Cont.)
Reference Voltage
Parameter
Test Conditions
Min
Typ
Max
Unit
Internal Reference Voltage
Reference Voltage
Input Voltage Regulation
Output Regulation
V
REFi
V
REF
V
RI
V
RO
I
REF
= −
1mA , T
C
= 25
o
C
I
REF
= −
1mA , T
C
= 25
o
C
I
REF
= −
1mA ,
V
DD
= 2.6V to 6.0V
I
REF
= −
0.1mA to
−
1
mA
0.622 0.641 0.660
V
1.280 1.293 1.306
-
-
1
1
10
6
mV
mV
EA (Error Amplifier)
Parameter
Test Condition
Min
-
-
0.5
70
1.7
-
Typ
-
±15
-
85
2.0
0.2
10
−
65
Max Unit
6
±100
1.5
-
-
0.4
-
−
45
Input Offset Voltage
Input Bias Current
Input Voltage Range
Open-Loop Voltage
Amplification
Output Voltage Swing
Output Sink Current
Output Source Current
Common-Mode Rejection
Ratio
V
IO
I
IB
V
IR
A
VO
V
OS
+
V
OS
−
I
OS
+
I
OS
−
CMRR
CH1,CH2, Unity Gain
CH1, CH2
CH1, CH2
mV
nA
V
dB
V
mA
µA
dB
OE=0.65V
OE=0.65V
3
-
60
80
-
PRDB (Power Good Protection)
Parameter
Test Condition
Min
-
Typ
0.2
Max Unit
0.4
V
Low Level Output Voltage
V
dbl
Pull-High
R
20
=
100k
Ω
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