AAT2146 Datasheet, PDF (1/19 Pages) Advanced Analogic Technologies – Low Noise, Fast Transient 600mA Step-Down Converter

SwitchReg^TM
PRODUCT DATASHEET
AAT2146
Low Noise, Fast Transient 600mA Step-Down Converter
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.
Features
• 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
• 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
VIN
LX
C2
2.2µF
EN
OUT
AGND PGND
PGND PGND
L1
4.7µH
V_O
C1
4.7µF
2146.2008.04.1.1
www.analogictech.com
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