AAT1151 Datasheet, PDF (1/16 Pages) Advanced Analogic Technologies – 850kHz 700mA Synchronous Buck DC/DC Converter

AAT1151
850kHz 700mA Synchronous Buck DC/DC Converter
General Description
The AAT1151 SwitchReg™ is a member of
AnalogicTech's Total Power Management IC™
(TPMIC™) product family. The step-down switching
converter is 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 PFM mode for light load current
to maintain high efficiency across all load conditions.
The AAT1151 is available in MSOP-8 and QFN33-16
packages and is rated over the -40°C to +85°C tem-
perature range.
Features
SwitchReg^™
• V_IN Range: 2.7V to 5.5V
• Up to 95% Efficiency
• High Initial Accuracy ±1%
• 110mΩ R_DS(ON) Internal Switches
• <1µA Shutdown Current
• 850kHz Switching Frequency
• Fixed V_OUT or Adjustable V_OUT ≥1.0V
• Integrated Power Switches
• Synchronous Rectification
• Current Mode Operation
• Internal Compensation
• Stable with Ceramic Capacitors
• PWM and 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
1151.2005.11.1.4
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