PRODUCT DATASHEET
AAT1112
SwitchReg
TM
General Description
The AAT1112 SwitchReg is a 1.5A step-down converter
with an input voltage range of 2.4V to 5.5V and an
adjustable output voltage from 0.6V to V
IN
. The 1.4MHz
switching frequency enables the use of small external
components. The small footprint and high efficiency make
the AAT1112 an ideal choice for portable applications.
The AAT1112 delivers 1.5A maximum output current
while consuming only 42μA of no-load quiescent current.
Ultra-low R
DS(ON)
integrated MOSFETs and 100% duty
cycle operation make the AAT1112 an ideal choice for
high output voltage, high current applications which
require a low dropout threshold.
The AAT1112 provides excellent transient response and
high output accuracy across the operating range. No
external compensation components are required.
The AAT1112 is designed to maintain high efficiency
throughout the load range. Pulling the MODE/ SYNC pin
high enables “PWM Only” mode, maintaining constant
frequency and low output ripple across the operating
range. Alternatively, the converter may be synchronized
to an external clock input via the MODE/SYNC pin. Over-
temperature and short-circuit protection safeguard the
AAT1112 and system components from damage.
The AAT1112 is available in a Pb-free, space-saving
TDFN33-12 or 2.75x3mm TSOPJW-12 package. The
product is rated over an operating temperature range of
-40°C to +85°C.
1.5A, 1.4MHz Step-Down Converter
Features
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1.5A Maximum Output Current
Input Voltage: 2.4V to 5.5V
Output Voltage: 0.6V to V
IN
Up to 95% Efficiency
42μA No Load Quiescent Current
No External Compensation Required
1.4MHz Switching Frequency
Synchronizable to External Clock
Optional “PWM Only” Low Noise Mode
100% Duty Cycle Low-Dropout Operation
Internal Soft Start
Over-Temperature and Current Limit Protection
<1μA Shutdown Current
TSOPJW-12 or TDFN33-12 Package
Temperature Range: -40°C to +85°C
Applications
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Cellular Phones
Digital Cameras
Hard Disk Drives
MP3 Players
PDAs and Handheld Computers
Portable Media Players
USB Devices
Typical Application
V
IN
VP
LX
L
1
3.3μH
V
OUT
= 3.3V
AAT1112
VIN
R
1
267kΩ
C
2
10μF
EN
MODE/SYNC
GND
FB
PGND
R
2
59kΩ
C
1
22μF
1112.2007.11.1.2
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