General Description
The AAT1155 SwitchReg is a step-down switching converter ideal for applications where high efficiency, small size, and low ripple are critical. Able to deliver 2.5A with an internal power MOSFET, the current-mode controlled IC provides high efficiency. Fully internally compensated, the AAT1155 simplifies 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 temperature range.

Features
• 5.5V Max Supply Input
• Fixed or Adjustable VOUT: 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
• Cable/DSL Modems
• Computer Peripherals
• High Efficiency Conversion from 5V or 3.3V Supply
• Network Cards
• Set-Top Boxes