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AAT2713 Datasheet

  • AAT2713

  • Low Noise Dual 600mA Step-Down Converter with Synchronizatio...

  • 1440.21KB

  • 23頁(yè)

  • ANALOGICTECH

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PRODUCT DATASHEET
AAT2713
SystemPower
TM
Low Noise Dual 600mA Step-Down Converter with Synchronization
Features
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V
IN
Range: 2.7V to 5.5V
Low Noise Light Load Mode
Low Ripple PWM Mode
Output Current:
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Channel 1: 600mA
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Channel 2: 600mA
96% Efficient Step-Down Converter
Low No Load Quiescent Current
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70渭A Total for Both Converters
Integrated Power Switches
100% Duty Cycle
1.7MHz Switching Frequency
Optional Fixed Frequency or External SYNC
Logic Selectable 180擄 Phase Shift Between the Two
Converters
Current Limit Protection
Automatic Soft-Start
Over-Temperature Protection
QFN33-16 Package
-40擄C to +85擄C Temperature Range
General Description
The AAT2713 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 bat-
teries. The AAT2713 incorporates a unique low noise
architecture which reduces ripple and spectral noise.
Each converter is capable of 600mA output current and
has its own enable pin. Efficiency of the converters is
optimized over full load range. Total no load quiescent
current is 70渭A, allowing high efficiency even under light
load conditions.
The integrated power switches are controlled by pulse
width modulation (PWM) with a 1.7MHz typical switching
frequency at full load, which minimizes the size of exter-
nal 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 synchro-
nize the switching frequency of both converters.
A phase shift pin (PS) is available to operate the two
converters 180擄 out of phase at heavy load to achieve
low input ripple.
The AAT2713 is available in a Pb-free, thermally
enhanced 16-pin QFN33 package and is specified for
operation over the -40擄C to +85擄C temperature range.
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Applications
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Cellular Phones / Smart Phones
Digital Cameras
Handheld Instruments
Micro Hard Disc Drives
Microprocessor / DSP Core / IO Power
PDAs and Handheld Computers
Typical Application
Input:
2.7V to 5.5V
C
IN
1渭F
VIN1
VIN2
VCC
L1
LX1
FB1
L2
LX2
2.2渭H
VOUT2
R3
C1
4.7渭F
VOUT1
R1
C2
4.7渭F
2.2渭H
AAT2713
MODE/SYNC
PS
EN1
EN2
R2
FB2
R4
AGND
PGND1 PGND2
2713.2008.01.1.0
www.analogictech.com
1

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