AAT2315_07 Datasheet, PDF (1/22 Pages) Advanced Analogic Technologies – Dual 600mA Step-Down Converter with Synchronization

General Description
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.
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.
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.
A phase shift pin (PS) is available to operate the
two converters 180° out of phase at heavy load to
achieve low input ripple.
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.
Typical Application
AAT2513
Dual 600mA Step-Down
Converter with Synchronization
Features
SystemPower^™
• V_IN 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
• 1.7MHz Switching Frequency
• Optional Fixed Frequency or External SYNC
• Logic Selectable 180° Phase Shift Between
the Two Converters
• Current Limit Protection
• Automatic Soft-Start
• Over-Temperature Protection
• QFN33-16 Package
• -40°C to +85°C Temperature Range
Applications
• Cellular Phones / Smart Phones
• Digital Cameras
• Handheld Instruments
• Micro Hard Disc Drives
• Microprocessor / DSP Core / IO Power
• PDAs and Handheld Computers
Input:
2.7V to 5.5V
CIN
1μF
VIN1
VIN2
LX1
VCC
FB1
AAT2513
LX2
MODE/SYNC
PS
EN1
EN2
AGND
FB2
PGND1 PGND2
L1
VOUT1
2μH
R1
L2
VOUT2
R2
2μH
R3
C1
4.7μF
R4
C2
4.7μF
2513.2007.04.1.1
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