LTC3894 Datasheet | Analog Devices

150V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability Features n Wide Operating VIN Range: 4.5V to 150V n Wide VOUT Range: 0.8V to 60V n 9μA IQ when Regulating 48VIN to 3.3VOUT n 16μA IQ when Regulating 12VIN to 3.3VOUT n Very Low Dropout Operation: 100% Duty Cycle n Adjustable Input Overvoltage Lockout n Programmable PGOOD Undervoltage Monitor n RSENSE or Inductor DCR Current Sensing 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 800k Hz n Internal Fixed Soft-Start and External Programmable Soft-Start or Voltage Tracking n Strong MOSFET Gate Driver with Selectable Undervoltage Lockout Thresholds n Optional External NMOS for Gate Driver Bias in High Power Applications APPLICATIONS n Automotive and Industrial Power Systems n Telemunication Power Systems n Distributed Power Systems DESCRIPTION The LTC®3894 is a high voltage step-down DC/DC switching regulator controller. It drives a P-channel power MOSFET switch allowing 100% duty cycle operation. It enables a low part count, simple, and robust solution for high reliability, high voltage applications. The LTC3894 operates over a wide input voltage range from 4.5V to 150V and can regulate output voltages from 0.8V to 60V. It offers excellent light load efficiency, drawing only 9μA quiescent current while regulating the output voltage with no load. Its peak current mode, constant frequency 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 800k Hz. The LTC3894 offers programmable output voltage softstart or tracking. Safety Features include overvoltage, overcurrent and overtemperature protection with a power good output monitor with adjustable threshold. The LTC3894 is available in a...