General Description

The MCP1603/B/L is a high-efficiency, fully-integrated 500 mA synchronous buck regulator whose 2.7V to 5.5V input voltage range makes it ideally suited for applications powered from 1-cell Li-Ion or 2-cell/3-cell NiMH/NiCd batteries.

Features

• Over 90% Typical Efficiency

• Output Current Up To 500 mA

• Low PFM Quiescent Current = 45 µA, typical

(MCP1603/L)

• Low Shutdown Current = 0.1 µA, typical

• Adjustable Output Voltage:

- 0.8V to 4.5V

• Fixed Output Voltage:

- 1.2V, 1.5V, 1.8V, 2.5V, 3.3V (MCP1603/L)

- 1.8V, 3.3V (MCP1603B)

• 2.0 MHz Fixed-Frequency PWM (Heavy Load)

• Automatic PWM-to-PFM Mode Transition

(MCP1603/L)

• PWM Mode Only Option (MCP1603B)

• 100% Duty Cycle Operation

• Internally Compensated

• Undervoltage Lockout (UVLO)

• Overtemperature Protection

• Space Saving Packages:

- 5-Lead TSOT, Two Pinout Types (MCP1603/L)

- 8-Lead 2 x 3 DFN

Applications

• Cellular Telephones

• Portable Computers

• Organizers / PDAs

• USB Powered Devices

• Digital Cameras

• Portable Equipment

• +5V or +3.3V Distributed Systems

• Headsets