AAT2513
Dual 600mA Step-Down
Converter with Synchronization
™
SystemPower
General Description
Features
The AAT2513 is a high efficiency dual synchronous
step-down converter for applications where power
efficiency, thermal performance and solution size
are critical. Input voltage ranges from 2.7V to 5.5V,
making it ideal for systems powered by single-cell
lithium-ion/polymer batteries.
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VIN Range: 2.7V to 5.5V
Output Current:
— Channel 1: 600mA
— Channel 2: 600mA
96% Efficient Step-Down Converter
Low No Load Quiescent Current
— 60µA Total for Both Converters
Integrated Power Switches
100% Duty Cycle
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Each converter is capable of 600mA output current
and has its own enable pin. Efficiency of the con-
verters is optimized over full load range. Total no
load quiescent current is 60µA, allowing high effi-
ciency even under light load conditions.
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1.7MHz Switching Frequency
Optional Fixed Frequency or External SYNC
Logic Selectable 180° Phase Shift Between
the Two Converters
The integrated power switches are controlled by
pulse width modulation (PWM) with a 1.7MHz typi-
cal switching frequency at full load, which minimizes
the size of external components. Fixed frequency,
low noise operation can be forced by a logic signal
on the MODE pin. Furthermore, an external clock
can be used to synchronize the switching frequency
of both converters.
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Current Limit Protection
Automatic Soft-Start
Over-Temperature Protection
QFN33-16 Package
-40°C to +85°C Temperature Range
A phase shift pin (PS) is available to operate the
Applications
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two converters 180° out of phase at heavy load to
achieve low input ripple.
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Cellular Phones / Smart Phones
Digital Cameras
The AAT2513 is available in a Pb-free, thermally
enhanced 16-pin QFN33 package and is specified
for operation over the -40°C to +85°C temperature
range.
Handheld Instruments
Micro Hard Disc Drives
Microprocessor / DSP Core / IO Power
PDAs and Handheld Computers
Typical Application
L1
VIN1
VOUT1
Input:
VIN2
LX1
FB1
LX2
2.7V to 5.5V
2μH
R1
VCC
CIN
1μF
L2
AAT2513
VOUT2
R3
C2
4.7μF
R2
2μH
MODE/SYNC
PS
C1
4.7μF
FB2
EN1
EN2
R4
AGND PGND1 PGND2
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