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

DATA SHEET
AAT1151
850kHz 700mA Synchronous Buck DC/DC Converter
General Description
The AAT1151 SwitchReg™ is a step-down switching con-
verter ideal for applications where high efficiency 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 applica-
tions. Capable of more than 700mA with internal
MOSFETs, the current-mode controlled IC provides high
efficiency using synchronous rectification. Fully inte-
grated compensation simplifies system design and low-
ers 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 tem-
perature range.
Features
• V_IN Range: 2.7V to 5.5V
• Up to 95% Efficiency
• High Initial Accuracy ±1%
• 110m 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
• 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
Applications
• Cellular Phones
• Digital Cameras
• MP3 Players
• Notebook Computers
• PDAs
• USB-Powered Equipment
• Wireless Notebook Adapters
10μF
100Ω
0.1μF
VP
FB
AAT1151
LX
ENABLE
VCC
SGND
PGND
3.0μH
2x 22μF
OUTPUT
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201991B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 18, 2013
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