AAT3183
300mA Inductorless Step-Down Converter
General Description
The AAT3183 is a high efficiency step-down charge
pump converter providing up to 300mA of output
current. The 1/2x (gain) charge pump converter
topology provides enhanced efficiency over conven-
tional LDO regulators and requires only three low
cost ceramic capacitors. No inductor is required;
saving space and cost when compared to inductive
switching regulators.
The AAT3183 typically consumes 35µA of no load
(zero output current) quiescent current, making it
ideal for portable battery powered systems.
Shutdown current is less than 1µA.
The AAT3183 soft-start prevents excessive inrush
current while providing monotonic turn-on charac-
teristics. The device includes integrated short-cir-
cuit and over-temperature (thermal) protection to
safeguard system components.
The AAT3183 is available in a Pb-free 2.0x2.1mm
SC70JW-8 package. Operating temperature range
is -40ºC to +85ºC.
Features
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ChargePump
™
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V
IN
Range: 2.7V to 5.5V
V
OUT
: 1.5V
300mA Maximum Output Current
Ultra-Small Solution for Portable Applications
— Small Footprint
— Only Three External Ceramic Capacitors
Required
— No Inductor
High Efficiency over the Output Current Range
Excellent Transient Performance
35µA Typical Quiescent Current
<1.0µA Shutdown Current
Up to 2MHz Switching Frequency
Integrated Soft-Start
Short-Circuit and Thermal Protection
2.0x2.1mm SC70JW-8 Package
-40ºC to 85ºC Temperature Range
Applications
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•
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Camcorders
Digital Still Cameras
DSP Core Supplies
PDAs, Handheld Devices, Notebook PCs
Smart Phones
Typical Application
C
FLY
1μF
C1-
V
IN
C
IN
1μF
IN
C1+
OUT
V
OUT
AAT3183
C
OUT
4.7μF
V
ENABLE
EN
GND
3183.2007.07.1.2
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
