LTC3822-1

LTC3822-1 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: 250kHz to 750kHz ■ 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 components. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors and improves efficiency. Burst Mod...