LTC3447

U U LTC3447 I2C Controllable Buck Regulator in 3mm × 3mm DFN FEATURES ■ I2C Programmable Output with 21.6mV Resolution ■ Overtemperature Protected ■ High Efficiency: 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 U APPLICATIO S ■ Distributed Power Supplies ■ Notebook Computers ■ PDAs and Other Handheld Devices , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131. DESCRIPTIO The LTC®3447 is a high efficiency 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. The buck regulator has optional external feedback resistors that can be used for setting the initial start up voltage. The feedback voltage reference for this start-up op...