AAT2500M Datasheet, PDF (1/22 Pages) Advanced Analogic Technologies – 400mA Step-Down Converter and 300mA LDO

AAT2500M
400mA Step-Down Converter and 300mA LDO
General Description
The AAT2500M is a high efficiency 400mA step-
down converter and 300mA low dropout (LDO) lin-
ear regulator for applications where power efficien-
cy and solution size are critical. The typical input
power source can be a single-cell Lithium-ion/poly-
mer battery or a 5V or 3.3V power bus.
The step-down converter is capable of delivering up
to 400mA output current, uses a typical switching
frequency of 1.8MHz to greatly reduce the size of
external components, offers high speed turn-on and
maintains a low 25µA no load quiescent current.
The LDO is capable of delivering up to 300mA out-
put current.
The AAT2500M is available in the Pb-free, space-
saving 12-pin TSOPJW package and is rated over
the -40°C to +85°C operating temperature range.
Features
SystemPower^™
• V_IN Range: 2.7V to 5.5V
• Output Current:
— Step-Down Converter: 400mA
— LDO: 300mA
• Low Quiescent Current
— 130µA Combined for Both Step-Down
Converter plus LDO
• 90% Efficient Step-down Converter (at 100mA)
• Integrated Power Switches
• 100% Duty Cycle
• 1.8MHz Switching Frequency
• Current Limit Protection
• Automatic Soft-Start
• Over Temperature Protection
• TSOPJW-12 Package
• -40°C to +85°C Temperature Range
Applications
• Cellular Phones
• Digital Cameras
• Handheld Instruments
• Micro Hard Disc Drives
• Microprocessor / DSP Core / IO Power
• Optical Storage Devices
• PDAs and Handheld Computers
• Portable Media Players
Typical Application
Input Supply
1µF
Enable Buck
Enable LDO
AAT2500M
2.7V to 5.5V
IN_BUCK
LX
4.7µF
IN_LDO
FB_BUCK
OUT_LDO
2.2µH
R1
R2
VOUT(LDO)
EN_BUCK
EN_LDO _{AGND PGND}
C1
2.2µF
VOUT_BUCK
C2
4.7µF
2500M.2007.06.1.0
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