500mA Step-Down Converter
General Description
The AAT1120 SwitchReg is a 1.5MHz step-down
converter 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 AAT1120 the ideal choice for portable
applications.
The AAT1120 delivers up to 500mA of load current,
while maintaining a low 30μA no load quiescent cur-
rent. The 1.5MHz switching frequency minimizes
the size of external components, while keeping
switching losses low. The AAT1120 feedback and
control delivers excellent load regulation and tran-
sient response with a small output inductor and
capacitor.
The AAT1120 is available in a Pb-free, 8-pin, 2x2mm
STDFN package and is rated over the -40°C to
+85°C temperature range.
AAT1120
Features
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SwitchReg
™
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
30μA Typical Quiescent Current
1.5MHz 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
AAT1120
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
1120.2007.01.1.0
1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
