LTC3822-1 Datasheet | Linear Technology

Features No RSENSETM, Low Input Voltage, Synchronous Step-Down DC/DC Controller DESCRIPTION - Dual N-Channel MOSFET Synchronous Drive - No Current Sense Resistor Required - Optimized for 3.3VIN and Li-Ion Applications - Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response - ±1% 0.6V Reference - Low Dropout Operation: 99% Duty Cycle - Phase-Lockable or Adjustable Frequency: 250k Hz to 750k Hz - Internal Soft-Start Circuitry - Tracking and Adjustable Soft-Start Input - Selectable Maximum Peak Current Sense Threshold - Selectable Burst Mode®/ Forced Continuous/Pulse Skipping Mode at Light Load - Digital RUN Control Pin - Output Overvoltage Protection - Micropower Shutdown: IQ = 7.5µA - Tiny Thermally Enhanced 12-Pin (3mm × 3mm) DFN or 16-Pin Narrow SSOP Packages APPLICATIONS - Single Cell Li-Ion Powered Systems - 3.3VIN Systems , LT, LTC, LTM and Burst Mode 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 Patents, including 5481178, 5929620, 6580258, 6304066, 5847554, 6611131, 6498466, 5705919. The LTC®3822-1 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using few external ponents. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors and improves efficiency. Burst Mode operation provides high efficiency at light loads. The 99% maximum duty cycle provides low dropout operation, extending operating time in battery-powered systems. The operating frequency can be programmed up to 750k Hz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3822-1 can be synchronized to an external clock from 250k Hz to 750k Hz. The LTC3822-1 is available in the tiny footprint thermally enhanced 12-pin DFN package or 16-pin...