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AAT1151 Datasheet(PDF) 1 Page - Advanced Analogic Technologies

Part No. AAT1151
Description  850kHz 700mA Synchronous Buck DC/DC Converter
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Maker  ANALOGICTECH [Advanced Analogic Technologies]
Homepage  http://www.analogictech.com
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AAT1151 Datasheet(HTML) 1 Page - Advanced Analogic Technologies

 
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SwitchReg
AAT1151
850kHz 700mA Synchronous
Buck DC/DC Converter
1151.2007.01.1.6
1
General Description
The AAT1151 SwitchReg™ is a step-down switch-
ing converter ideal for applications where high effi-
ciency is required over the full range of output load
conditions. The 2.7V to 5.5V input voltage range
makes the AAT1151 ideal for single-cell lithium-
ion/polymer battery applications. Capable of more
than 700mA with internal MOSFETs, the current-
mode controlled IC provides high efficiency using
synchronous rectification. Fully integrated compen-
sation simplifies system design and lowers external
parts count.
The device operates at a fixed 850kHz switching fre-
quency and enters Pulse Frequency Modulation
(PFM) mode for light load current to maintain high
efficiency across all load conditions.
The AAT1151 is available in Pb-free MSOP-8 and
QFN33-16 packages and is rated over the -40°C to
+85°C temperature range.
Features
•VIN Range: 2.7V to 5.5V
Up to 95% Efficiency
High Initial Accuracy ±1%
110m
Ω RDS(ON) Internal Switches
•<1μA Shutdown Current
850kHz Switching Frequency
Fixed VOUT or Adjustable VOUT ≥1.0V
Integrated Power Switches
Synchronous Rectification
Current Mode Operation
Internal Compensation
Stable with Ceramic Capacitors
PFM for Optimum Efficiency for All Load
Conditions
Internal Soft Start
Over-Temperature Protection
Current Limit Protection
MSOP-8 and QFN33-16 Packages
-40°C to +85°C Temperature Range
Applications
Cellular Phones
Digital Cameras
MP3 Players
Notebook Computers
PDAs
USB-Powered Equipment
Wireless Notebook Adapters
Typical Application
OUTPUT
3.0
μH
2x 22
μF
10
μF
0.1
μF
100
Ω
LX
VP
INPUT
FB
SGND
AAT1151
ENABLE
VCC
PGND


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