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Linear Technology Corp. introduces the LTC3864, a high voltage step-down DC/DC controller that draws only 40 µA quiescent current in standby mode with the output enabled in Burst Mode® operation. The 3.5 to 60 V input supply range is designed to protect against high voltage transients, to operate continuously during automotive cold crank and covers a broad range of input sources and battery chemistries. The output voltage can be set from 0.8 V to VIN due to its 100% duty cycle capability, making it well suited for 12 or 24 V automotive, heavy equipment, industrial control, robotics and telecom applications.
The LTC3864 drives an external P-channel MOSFET, operates with a selectable fixed frequency between 50kHz and 850kHz, and is synchronizable to an external clock from 75kHz to 750kHz. The user can select from pulse skipping and low ripple Burst Mode operation during light loads. Its current-mode architecture provides easy loop compensation, fast transient response and excellent line regulation. Output current sensing is accomplished by measuring the voltage drop across a sense resistor for highest accuracy. Additional features include programmable soft start or tracking, overvoltage protection, overcurrent and short-circuit protection, a power good output signal and FMEA (failure mode and effects analysis) verified for adjacent pin opens and shorts.
Summary of Features: LTC3864
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