Chandler, Ariz. - Microchip Technology's MCP1601 is a 500-milliamp dc/dc synchronous step-down converter for cellular phones, PDAs, digital cameras and USB-powered devices.
Delivering 0.9 volts to Vin at up to 500 mA continuous from a 2.7- to 5.5-V input, the unit operates in three modes and automatically switches among them to follow a maximum-efficiency curve for a given application. These include the use of pulse-width modulation for normal medium- to high-load conditions, pulse-frequency modulation for light or no-load conditions over an extended time, and low-dropout mode for cases when the input approaches the output voltage.
The converter includes overcurrent, overtemperature and undervoltage lockout protection. An externally controllable shutdown mechanism minimizes drain current during system inactivity.
The MCP1601 can be implemented with a complete ceramic-capacitor solution, eliminating the need for larger tantalum caps, the company said. Shutdown current is typically less than 0.1 microamp. Available in an eight-pin MSOP, this device is priced at $1.85 each in lots of 1,000. Samples and volume-production quantities are available.
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