PRODUCT DATASHEET
AAT2146
SwitchReg
TM
General Description
The AAT2146 SwitchReg is a 2MHz step-down converter
with an input voltage range of 2.7V to 5.5V and output
voltage as low as 0.6V. It is optimized to react quickly to
a load variation. The AAT2146 incorporates a unique low
noise architecture which reduces ripple and spectral
noise.
The AAT2146 is available in fixed voltage versions with
internal feedback and a programmable version with
external feedback resistors. It can deliver 600mA of load
current while maintaining a low 37μA no load quiescent
current. The 2MHz switching frequency minimizes the
size of external components while keeping switching
losses low.
The AAT2146 is designed to maintain high efficiency
throughout the operating range, which is critical for por-
table applications.
The AAT2146 is available in the Pb-free, space-saving
2.0x2.1mm SC70JW-8 package and is rated over the
-40°C to +85°C temperature range.
Low Noise, Fast Transient 600mA Step-Down Converter
Features
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V
IN
Range: 2.7V to 5.5V
Low Noise Light Load Mode
Low Ripple PWM Mode
V
OUT
Fixed or Adjustable from 0.6V to V
IN
37μA No Load Quiescent Current
Up to 98% Efficiency
600mA Max Output Current
2MHz Switching Frequency
150μs Soft Start
Fast Load Transient
Over-Temperature Protection
Current Limit Protection
100% Duty Cycle Low-Dropout Operation
<1μA Shutdown Current
SC70JW-8 Package
Temperature Range: -40°C to +85°C
Applications
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Cellular Phones
Digital Cameras
Handheld Instruments
Microprocessor / DSP Core / IO Power
PDAs and Handheld Computers
USB Devices
Typical Application (Fixed Output Voltage)
U1
AAT2146
V
IN
C2
2.2µF
L1
4.7µH
VIN
EN
AGND
PGND
LX
OUT
PGND
PGND
V
O
C1
4.7µF
2146.2008.04.1.1
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