AAT2120_08 Datasheet, PDF (1/19 Pages) Advanced Analogic Technologies – 500mA Low Noise Step-Down Converter

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.
PRODUCT DATASHEET
AAT2120
500mA Low Noise Step-Down Converter
Features
• 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
• Bluetooth^® Headsets
• Cellular Phones
• Digital Cameras
• Handheld Instruments
• Micro Hard Disk Drive
• Portable Music Players
• USB Devices
Typical Application
V_IN
C₁
4.7µF
AAT2120
VP
LX
VIN
EN
FB
GND PGND
V_O = 1.8V
L1
3.0µH
R₁
118kΩ
500mA
R₂
59kΩ
C₂
4.7µF
2120.2008.02.1.2
www.analogictech.com
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