PRODUCT DATASHEET
AAT1
161
SwitchReg
TM
Electrical Characteristics
4.0V < V
IN
< 13.2V. C
IN
= 22µF, C
OUT
= 66µF; L= 2.2µH or 3.8µH, T
A
= -40 to +85°C unless otherwise noted. Typical val-
ues are at T
A
= 25°C.
Symbol
V
IN
V
UVLO
I
Q
I
SHDN
V
OUT
V
OUT
∆V
LINEREG
/
∆V
IN
∆V
LOADREG
V
FB
I
FBLEAK
F
OSC
T
S
DC
T
ON
T
SS
R
DS(ON)H
η
I
LIM
I
LXLEAK
T
SD
T
HYS
V
ILEN
V
IHEN
I
EN
13.2V Input, 3A Step-Down Converter
Description
Input Voltage Range
Input Under-Voltage Lockout
Supply Current
Shutdown Current
Output Voltage Range
Output Voltage Accuracy
Line Regulation
Load Regulation
Feedback Reference Voltage (adjustable
version)
FB Leakage Current
Oscillator Frequency
Start-Up Time
Foldback Frequency
Maximum Duty Cycle
Minimum Turn-On Time
Soft-Start Time
P-Channel On Resistance
Efficiency
PMOS Current Limit
LX Leakage Current
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
EN Logic Low Input Threshold
EN Logic High Input Threshold
EN Input Current
Conditions
Rising
Hysteresis
No Load
V
EN
= GND
Min
4.0
Typ
Max
13.2
4.0
Units
V
V
µA
µA
V
%
%/V
%
0.3
150
0.6
I
OUT
= 0A to 3A
V
IN
= 4.5V to 13.2V
V
IN
= 12V, V
OUT
= 5V, I
OUT
= 0A to 3A
No Load, T
A
= 25°C
V
OUT
= 1.2V
Adjustable Version
Fixed Version
-2.5
0.023
0.4
0.59
0.60
2
0.8
2
200
100
2
0.12
0.15
90
6.0
300
1
0.94
V
IN
2.5
0.61
0.2
V
µA
MHz
ms
kHz
%
ns
ms
Ω
%
A
µA
°C
°C
V
V
µA
0.6
I
OUT
= 3A, V
OUT
= 5V
1
94
V
IN
= 12V
V
IN
= 6V
V
IN
= 12V, V
OUT
= 5V, I
OUT
= 3A
4.0
V
IN
= 13.2V, V
LX
= 0 to V
IN
1
140
25
0.4
1.4
-1.0
V
EN
= 0V, V
EN
= 13.2V
1.0
1. The AAT1161 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correla-
tion with statistical process controls.
4
www.analogictech.com
1161.2008.03.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
