AAT1161 Datasheet, PDF (1/18 Pages) Advanced Analogic Technologies – 13.2V Input, 3A Step-Down Converter

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PRODUCT DATASHEET
AAT1161
13.2V Input, 3A Step-Down Converter
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.
Features
• Input Voltage Range : 4.0V to 13.2V
• Up to 3A Load Current
• Fixed or Adjustable Output:
▪ Output Voltage: 0.6V to VIN
• 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
C₆
10µF
R₄
10Ω
C₈
1µF
C₂
0.1µF
6 _EN
10
IN
11
IN
13
AIN
LX ⁸
LX ⁹
AAT1161 FB ¹
PGND ¹²
4, 5
DGND
COMP ²
7 _N/C
PGND
AGND ³
14
LDO
EP1
C₉
1µF
L₁
3.8µH
C₁
D1 _100pF
R₅
51kΩ
V_OUT
5V, 3A
R₃
432 kΩ
C_{3, 4, 5}
66µF
R₆
59kΩ
C₇
150pF
1161.2008.03.1.0
www.analogictech.com
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