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.

特性 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