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Advanced Analogic Technologies

AAT2713 Datasheet Preview

AAT2713 Datasheet

Low Noise Dual 600mA Step-Down Converter

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SystemPowerTM
PRODUCT DATASHEET
AAT2713
Low Noise Dual 600mA Step-Down Converter with Synchronization
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 70μA, 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° 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°C to +85°C temperature range.
Features
• VIN Range: 2.7V to 5.5V
• Low Noise Light Load Mode
• Low Ripple PWM Mode
• Output Current:
Channel 1: 600mA
Channel 2: 600mA
• 96% Efficient Step-Down Converter
• Low No Load Quiescent Current
70μA 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
Typical Application
Input:
2.7V to 5.5V
CIN
1μF
VIN1
VIN2
LX1
VCC
FB1
AAT2713
LX2
MODE/SYNC
PS
EN1
EN2
AGND
FB2
PGND1 PGND2
L1
2.2μH
R1
L2
2.2μH
VOUT2
R2
R3
C1
4.7μF
R4
VOUT1
C2
4.7μF
2713.2008.01.1.0
www.analogictech.com
1




Advanced Analogic Technologies

AAT2713 Datasheet Preview

AAT2713 Datasheet

Low Noise Dual 600mA Step-Down Converter

No Preview Available !

SystemPowerTM
PRODUCT DATASHEET
AAT2713
Low Noise Dual 600mA Step-Down Converter with Synchronization
Pin Descriptions
Pin #
1
2
4, 3
5, 16
6, 15
7, 14
8, 13
10, 9
11
12
EP
Symbol
PS
AGND
FB1, FB2
VIN1, VIN2
N/C
LX1, LX2
PGND1, PGND2
EN1, EN2
VCC
MODE/SYNC
Function
Phase shift pin. Logic high enables the PS feature which forces the two converters to operate
180° out of phase when both are in forced PWM mode.
Analog ground. Return the feedback resistive divider to this ground. See section on PCB layout
guidelines and evaluation board layout diagram.
Feedback input pins. An external resistive divider ties to each and programs the respective out-
put voltage to the desired value.
Input supply voltage pins. Must be closely decoupled to the respective PGND.
Not connected
Output switching nodes that connect to the respective output inductor.
Main power ground return. Connect to the input and output capacitor return. See section on PCB
layout guidelines and evaluation board layout diagram.
Converter enable input pins. A logic high enables the converter channel. A logic low forces the
channel into shutdown mode, reducing the channel supply current to less than 1μA. This pin
should not be left oating. When not actively controlled, this pin can be tied directly to VIN and/
or VCC.
Control circuit power supply. Connect to the higher voltage of VIN1 or VIN2.
Logic low enables light load mode operation for light loads and xed-frequency PWM operation
for heavy loads. Logic high forces low noise PWM operation under all operating conditions. Con-
nect to an external clock for synchronization (PWM only).
Exposed paddle (bottom). Use properly sized vias for thermal coupling to the ground plane. See
section on PCB layout guidelines.
Pin Configuration
QFN33-16
(Top View)
PS 1
AGND 2
FB2 3
FB1 4
12 MODE/SYNC
11 VCC
10 EN1
9 EN2
2
www.analogictech.com
2713.2008.01.1.0


Part Number AAT2713
Description Low Noise Dual 600mA Step-Down Converter
Maker Advanced Analogic Technologies
Total Page 23 Pages
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