LTC3864 Datasheet | Linear Technology

LTC3864 60V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability Features n Wide Operating VIN Range: 3.5V to 60V n Wide VOUT Range: 0.8V to VIN n Low Operating IQ = 40µA n Very Low Dropout Operation: 100% Duty Cycle n Strong High Voltage MOSFET Gate Driver n Constant Frequency Current Mode Architecture n Verified FMEA for Adjacent Pin Open/Short n Selectable High Efficiency Burst Mode® Operation or Pulse-Skipping Mode at Light Loads n Programmable Fixed Frequency: 50k Hz to 850k Hz n Phase-Lockable Frequency: 75k Hz to 750k Hz n Accurate Current Limit n Programmable Soft-Start or Voltage Tracking n Internal Soft-Start Guarantees Smooth Start-Up n Power Good Output Voltage Monitor n Low Shutdown IQ = 7µA n Available in Small 12-Pin Thermally Enhanced MSOP and DFN Packages Applications n Industrial and Automotive Power Supplies n Tele Power Supplies n Distributed Power Systems Description The LTC®3864 is a robust, high voltage step-down DC/DC controller optimized for automotive and industrial applications. It drives a P-channel power MOSFET switch allowing 100% duty cycle operation. The wide input and output voltage ranges cover a multitude of applications. This device has been verified with the failure mode and effects analysis (FMEA) procedure for operation during failure conditions. The LTC3864 offers excellent light load efficiency, drawing only 40µA quiescent current in a user programmable Burst Mode operation. Its peak current mode, constant frequency PWM architecture provides for good control of switching frequency and output current limit. The switching frequency can be programmed from 50k Hz to 850k Hz with an external resistor and can be synchronized to an external clock from 75k Hz to 750k Hz. The LTC3864 offers programmable soft-start or output tracking. Safety Features include overvoltage protection, overcurrent and short-circuit protection including frequency foldback and a power good output signal. The LTC3864 is...