PRODUCT DATASHEET
AAT1
161
SwitchReg
TM
General Description
The AAT1161 is an 800kHz high efficiency step down
DC-DC converter with wide input voltage range. With
4.0V to 13.2V input rating, the AAT1161 is the perfect
choice for 2-cell Li+ battery powered devices and mid
power range regulated 12V powered applications. The
internal power switch is capable of delivering up to 3A
load current.
The AAT1161 is a highly integrated device in order to
simplify system level design for the users. It is a non-
synchronous converter that is used with an external
Schottky diode rectifier for low-cost applications.
Minimum external components are required for the con-
verter. All the control circuits are integrated in the IC.
The AAT1161 optimizes efficiency throughout the entire
load range. It operates in a combination PWM/Light Load
mode for improved light-load efficiency. It can also oper-
ate in a forced Pulse Width Modulation (PWM) mode for
easy control of the switching noise as well as faster tran-
sient response. The high switching frequency allows the
use of small external components. The low current shut-
down feature disconnects the load from V
IN
and drops
shutdown current to less than 1μA.
The AAT1161 is available in a Pb-free, space-saving,
thermally-enhanced 14-pin TDFN33 package and is rated
over an operating temperature range of -40°C to +85°C.
13.2V Input, 3A Step-Down Converter
Features
•
Input Voltage Range : 4.0V to 13.2V
•
Up to 3A Load Current
•
Fixed or Adjustable Output:
▪
Output Voltage: 0.6V to V
IN
•
Less than 1μA Shutdown Current
•
Up to 95% Efficiency
•
Integrated High-Side Power Switch
•
External Schottky Rectifier
•
800kHz Switching Frequency
•
Soft Start Function
•
Short-Circuit and Over-Temperature Protection
•
Minimum External Components
•
Tiny 14-pin 3x3mm TDFN Package
•
Temperature Range: -40°C to +85°C
Applications
•
•
•
•
•
Digital Camcorders
Industrial Applications
Portable DVD Players
Rack Mounted Systems
Set Top Boxes
Typical Application
V
IN
4.5V- 13.2V
6
L
1
3.8µH
EN
IN
C
2
0.1µF
11
LX
LX
8
V
OUT
5V, 3A
R
3
432 kΩ
R
6
59kΩ
R
5
51kΩ
C
6
10µF
R
4
10Ω
10
9
1
IN
13
C
1
D1 100pF
AAT1161
FB
PGND
COMP
AGND
C
3, 4, 5
66µF
C
8
1µF
AIN
4, 5
12
2
DGND
N/C
PGND
EP1
7
3
14
LDO
C
9
1µF
C
7
150pF
1161.2008.03.1.0
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