PRODUCT DATASHEET
AAT2153
SwitchReg
TM
General Description
The AAT2153 SwitchReg is a 2.5A step-down converter
with an input voltage range of 2.7V 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 AAT2153 an ideal choice for portable applications.
The AAT2153 delivers 2.5A 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 AAT2153 an ideal choice for
high output voltage, high current applications which
require a low dropout threshold.
The AAT2153 provides excellent transient response and
high output accuracy across the operating range. No
external compensation components are required.
The AAT2153 maintains high efficiency throughout the
load range. The AAT2153’s unique architecture produces
reduced ripple and spectral noise. Over-temperature and
short-circuit protection safeguard the AAT2153 and sys-
tem components from damage.
The AAT2153 is available in a Pb-free, space-saving
16-pin 3x3mm QFN package. The product is rated over
an operating temperature range of -40°C to +85°C.
2.5A Low Noise Step-Down Converter
Features
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2.5A Maximum Output Current
Input Voltage: 2.7V to 5.5V
Output Voltage: 0.6V to V
IN
Up to 95% Efficiency
Low Noise Light Load Mode
42μA No Load Quiescent Current
No External Compensation Required
1.4MHz Switching Frequency
100% Duty Cycle Low-Dropout Operation
Internal Soft Start
Over-Temperature and Current Limit Protection
<1μA Shutdown Current
16-Pin 3x3mm QFN 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
3.3V
12
11
10
U1
AAT2153
VP
VP
VP
EN
VCC
N/C
N/C
FB
LX
LX
LX
N/C
PGND
PGND
4
15
14
13
16
3
2
1
2.5V
R3
187k
L1
2.2µH
C1
10µF
7
9
6
8
5
R4
59k
C3
22µF
SGND PGND
2153.2008.09.1.0
www.analogictech.com
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