Dual 400mA High Frequency Buck Converter
General Description
The AAT2512 is a member of AnalogicTech's Total
Power Management IC™ (TPMIC™) product fam-
ily. It is a dual channel synchronous buck convert-
er operating with an input voltage range of 2.7V to
5.5V, making it ideal for applications with single-
cell lithium-ion/polymer batteries.
Both regulators have independent input and
enable pins. Offered with fixed or adjustable out-
put voltages, each channel is designed to operate
with 27µA (typical) of quiescent current, allowing
for high efficiency under light load conditions.
The AAT2512 requires only three external compo-
nents (C
IN
, C
OUT
, and L
X
) for each converter, mini-
mizing cost and real estate. Both channels are
designed to deliver 400mA of load current and
operate with a switching frequency of 1.4MHz,
reducing the size of external components.
The AAT2512 is available in a Pb-free, 12-pin
TDFN33 package and is rated over the -40°C to
+85°C temperature range.
AAT2512
Features
•
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•
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SystemPower
™
V
IN
Range: 2.7V to 5.5V
Output Current:
— Channel 1: 400mA
— Channel 2: 400mA
98% Efficient Step-Down Converter
Integrated Power Switches
100% Duty Cycle
1.4MHz Switching Frequency
Internal Soft Start
150µs Typical Turn-On Time
Over-Temperature Protection
Current Limit Protection
Available in TDFN33-12 Package
-40°C to +85°C Temperature Range
Applications
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Cellular Phones
Digital Cameras
Handheld Instruments
Microprocessor / DSP Core/ IO Power
PDAs and Handheld Computers
Typical Application
V
OUT1
L1
4.7µH
VIN1
LX1
V
BAT
C
IN
VIN2
FB1
AAT2512
EN1
LX2
L2
4.7µH
V
OUT2
EN2
GND
FB2
4.7µF
C
OUT
4.7µF
2512.2006.06.1.4
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
