LTC3863 Datasheet | Linear Technology

60V Low IQ Inverting DC/DC Controller Features n Wide Operating VIN Range: 3.5V to 60V n Wide Negative VOUT Range: - 0.4V to Beyond - 150V n Low Operating IQ = 70µA 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 Low Shutdown IQ = 7µA n Available in Small 12-Lead Thermally Enhanced MSOP and DFN Packages APPLICATIONS n Industrial and Automotive Power Supplies n Tele Power Supplies n Distributed Power Systems DESCRIPTION The LTC®3863 is a robust, inverting DC/DC PMOS controller optimized for automotive and industrial applications. It drives a P-channel power MOSFET to generate a negative output and requires just a single inductor to plete the circuit. Output voltages from - 0.4V to - 150V are typically achievable with higher voltages possible, only limited by external ponents. The LTC3863 offers excellent light load efficiency, drawing only 70μA 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 LTC3863 offers programmable soft-start or output tracking. Safety Features include overvoltage, overcurrent and short-circuit protection including frequency foldback. The LTC3863 is available in thermally enhanced 12-lead MSOP and 3mm × 4mm DFN packages. All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including...