General Description
The AAT1156 SwitchReg is a step-down switching converter ideal for applications where high efficiency is required over the full range of load conditions. The 2.7V to 5.5V input voltage range makes the AAT1156 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 over a wide operating range. Fully integrated compensation simplifies system design and lowers external parts count.

Features
• VIN Range: 2.7V to 5.5V
• Up to 95% Efficiency
• 110mΩ RDS(ON) Internal Switches
• <1μA Shutdown Current
• 1MHz Step-Down Switching Frequency
• Fixed or Adjustable VOUT ≥ 0.8V
• Integrated Power Switches
• Current Mode Operation
• Internal Compensation
• Stable with Ceramic Capacitors
• Internal Soft Start
• Over-Temperature Protection
• Current Limit Protection
• 16-Pin QFN 3x3mm Package
• -40°C to +85°C Temperature Range

Applications
• Cellular Phones
• Digital Cameras
• MP3 Players
• Notebook Computers
• PDAs
• Wireless Notebook Adapters