Linear Technology announces the LTC3447, a 600mA current mode buck regulator in a 3mm x 3mm DFN-10 package. Using an onboard I2C interface, the output voltage can be set between 0.69V and 2.05V using an internal 6-bit DAC. The LTC3447's 2.5V to 5.5V input voltage range makes it ideal for powering Intel's xScale microprocessor core voltage in single Li-Ion or multi-cell alkaline/NiCd/NiMH battery-powered applications.

The LTC3447 synchronous buck regulator can deliver up to 600mA of output current with efficiencies of up to 93%. The I2C interface frequency can be set at either the standard 100kHz or the 400kHz "fast mode" while output voltages can be programmed with 21.6mV resolution. A constant 1.0MHz switching frequency ensures low noise and allows the use of tiny surface mount inductors and capacitors. For extended battery life automatic Burst Mode® operation reduces light load supply current to only 33uA dropping to 1uA in shutdown. For low noise applications, the Burst Mode feature can be disabled. Other features include soft-start and start up Power Good blanking.

The LTC3447 is available in a 3mm x 3mm DFN-10 is available from stock. Pricing starts at $1.95 each for 1,000-piece quantities.