LTC3447
LTC3447 is I2C Controllable Buck Regulator manufactured by Linear Technology.
I2C Controllable Buck Regulator in 3mm × 3mm DFN
Features
- I2C Programmable Output with 21.6m V Resolution
- Overtemperature Protected
- High Efficiency: Up to 93%
- Very Low Quiescent Current: Only 33µA
- 600m A 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 (100k Hz) or Fast Mode (400k Hz) 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 puters
- 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 option is 0.6V. Once the voltage DAC is updated via the I2C, the buck regulator switches from external to internal feedback resistors. When there are no external resistors, the default start-up voltage is 1.38V.
The switching frequency is internally set at 1MHz, allowing the use of small surface mount inductors and...
