LTC3822

LTC3822 No RSENSE™, Low Input Voltage, Synchronous Step-Down DC/DC Controller FEATURES n No Current Sense Resistor Required n All N-Channel MOSFET Synchronous Drive n High Current Outputs Possible n Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response n VIN: 2.75V to 4.5V n ±1% 0.6V Reference n Low Dropout Operation: 99% Duty Cycle n Selectable Frequency (300kHz/550kHz/750kHz) n Internal Soft-Start Circuitry n Selectable Maximum Peak Current Sense Threshold n Digital RUN Control Pin n Output Overvoltage Protection n Micropower Shutdown: IQ = 7.5μA n Tiny Thermally Enhanced Leadless (3mm × 3mm) DFN or 10-Lead MSOP Package DESCRIPTION The LTC®3822 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors and improves efficiency. A maximum duty cycle of 99% provides low dropout operation. The switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. The LTC3822 is available in thermally enhanced DFN and 10-lead MSOP packages. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5929620, 6580258, 6304066, ...