DESCRIPTION
The LTC®3447 is a high effi ciency monolithic synchronous current mode buck regulator. Using an I2C interface, the output voltage can be set between 0.69V and 2.05V using an internal 6-bit DAC.

FEATURES
■ I2C Programmable Output with 21.6mV Resolution
■ Overtemperature Protected
■ High Effi ciency: Up to 93%
■ Very Low Quiescent Current: Only 33µA
■ 600mA Output Current at VIN = 3V
■ 2.5V to 5.5V Input Voltage Range
■ 1MHz Constant Frequency Operation
■ No Schottky Diode Required
■ Low Dropout Operation: 100% Duty Cycle
■ Stable with Ceramic Capacitors
■ Shutdown Mode Draws <1µA Supply Current
■ ±2% Output Voltage Accuracy
■ Standard (100kHz) or Fast Mode (400kHz) I2C
■ 6-Bit Voltage DAC (0.69V to 2.05V)
■ Disable Burst Mode Operation
■ Enable Power Good Blanking
■ Optional External Start-Up Resistors
■ Soft-Start
■ 10 Lead, 3mm × 3mm DFN Package

APPLICATIONS
■ Distributed Power Supplies
■ Notebook Computers
■ PDAs and Other Handheld Devices