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

DATA SHEET
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.
Typical Application
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
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
LDO ¹⁴
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
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201997A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 28, 2012
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