PRODUCT DATASHEET
AAT2120
SwitchReg
TM
General Description
The AAT2120 SwitchReg is a 1.8MHz step-down con-
verter with an input voltage range of 2.7V to 5.5V and
output as low as 0.6V. Its low supply current, small size,
and high switching frequency make the AAT2120 the
ideal choice for portable applications.
The AAT2120 delivers up to 500mA of load current, while
maintaining a low 45μA no load quiescent current. The
1.8MHz switching frequency minimizes the size of exter-
nal components, while keeping switching losses low. The
AAT2120 feedback and control delivers excellent load
regulation and transient response with a small output
inductor and capacitor.
The AAT2120 maintains high efficiency throughout the
load range. The AAT2120’s unique architecture produces
reduced ripple and spectral noise. Over-temperature and
short-circuit protection safeguard the AAT2120 and sys-
tem components from damage.
The AAT2120 is available in a Pb-free, 8-pin, 2x2mm
STDFN package and is rated over the -40°C to +85°C
temperature range.
500mA Low Noise Step-Down Converter
Features
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V
IN
Range: 2.7V to 5.5V
V
OUT
Range: 0.6V to V
IN
Up to 500mA Output Current
Up to 96% Efficiency
Low Noise Light Load Mode
45μA Typical Quiescent Current
1.8MHz Switching Frequency
Soft-Start Control
Over-Temperature and Current Limit Protection
100% Duty Cycle Low-Dropout Operation
<1μA Shutdown Current
Small External Components
Ultra-Small STDFN22-8 Package
Temperature Range: -40°C to +85°C
Applications
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Bluetooth
®
Headsets
Cellular Phones
Digital Cameras
Handheld Instruments
Micro Hard Disk Drive
Portable Music Players
USB Devices
Typical Application
V
IN
AAT2120
VP
VIN
C
1
4.7µF
EN
FB
LX
L1
3.0µH
R
1
118kΩ
R
2
59kΩ
C
2
4.7µF
V
O
= 1.8V
500mA
GND
PGND
2120.2008.02.1.2
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