1MHz 2.5A Step-Down DC/DC Converter
General Description
The AAT1155 SwitchReg is a step-down switching
converter ideal for applications where high efficien-
cy, small size, and low ripple are critical. Able to
deliver 2.5A with an internal power MOSFET, the
current-mode controlled IC provides high efficien-
cy. Fully internally compensated, the AAT1155 sim-
plifies system design and lowers external parts
count.
The AAT1155 is available in a Pb-free MSOP-8
package and is rated over the -40°C to +85°C tem-
perature range.
AAT1155
Features
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SwitchReg
™
5.5V Max Supply Input
Fixed or Adjustable V
OUT
: 1.0V to 4.2V
2.5A Output Current
Up to 95% Efficiency
Integrated Low On Resistance Power
Switches
Internally Compensated Current Mode Control
1MHz Switching Frequency
Constant Pulse Width Modulation (PWM)
Mode
Low Output Ripple with Light Load
Internal Soft Start
Current Limit Protection
Over-Temperature Protection
MSOP-8 Package
-40°C to +85°C Temperature Range
Applications
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Cable/DSL Modems
Computer Peripherals
High Efficiency Conversion from 5V or 3.3V
Supply
Network Cards
Set-Top Boxes
Typical Application
INPUT
10μF
VP
FB
AAT1155
EN
100Ω
VCC
LX
LX
1.5μH
OUTPUT
GND
0.1μF
120μF
1155.2006.09.1.7
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
