AAT1151 View Datasheet(PDF) - Advanced Analogic Technologies
Part Name
Description
MFG CO.
'AAT1151' PDF : 16 Pages View PDF
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.
AAT1151
850kHz 700mA Synchronous
Buck DC/DC Converter
Features
SwitchReg™
• VIN Range: 2.7V to 5.5V
• Up to 95% Efficiency
• High Initial Accuracy ±1%
• 110mΩ 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
Typical Application
INPUT
10μF
100Ω
0.1μF
Applications
• Cellular Phones
• Digital Cameras
• MP3 Players
• Notebook Computers
• PDAs
• USB-Powered Equipment
• Wireless Notebook Adapters
VP
FB
AAT1151
LX
ENABLE
VCC
SGND
PGND
3.0μH
2x 22μF
OUTPUT
1151.2007.01.1.6
1
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