SwitchReg
™
AAT1150
1MHz 1A Step-Down DC/DC Converter
1150.2005.03.1.2 1
General Description
The AAT1150 SwitchReg™ is a member of
AnalogicTech's Total Power Management IC™
(TPMIC™) product family. The step-down switch-
ing converter is ideal for applications where high
efficiency, small size, and low ripple are critical.
Able to deliver 1A with internal power MOSFETs,
the current-mode controlled IC provides high effi-
ciency using synchronous rectification. Fully inter-
nally compensated, the AAT1150 simplifies system
design and lowers external parts count.
The AAT1150 is available in an MSOP-8 package
and is rated over the -40°C to +85°C temperature
range.
Features
•V
IN
Range: 2.7V to 5.5V
• Up to 95% Efficiency
• 110mΩ R
DS(ON)
MOSFET Switch
• <1.0µA of Shutdown Current
• 1MHz Switching Frequency
• Fixed or Adjustable V
OUT
: 1.0V to 4.2V
• High Initial Accuracy: ±1%
• 1.0A Peak Current
• Integrated Power Switches
• Synchronous Rectification
• Internally Compensated Current Mode Control
• Constant PWM Mode for Low Output Ripple
• Internal Soft Start
• Current Limit Protection
• Over-Temperature Protection
• MSOP-8 package
• -40°C to +85°C Temperature Range
Applications
• Cable/DSL Modems
• Computer Peripherals
• High Efficiency Conversion From 5V or 3.3V
Supply
• Network Cards
• Set-Top Boxes
Typical Application
OUTPUT
4.1µH
2x 22µF
10µF
0.1µF
100Ω
LX
VP
INPUT
FB
SGND
AAT1150
ENABLE
VCC
PGND