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LTC3873-5 Datasheet Boost/flyback/sepic DC/dc Controller

Manufacturer: Linear Technology (now Analog Devices)

Overview: LTC3873-5 No RSENSETM Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC.

General Description

The LTC®3873-5 is a constant frequency current mode controller for boost, flyback or SEPIC DC/DC converters designed to drive an N-channel MOSFET for high input and output voltage converter applications.

The LTC3873-5 provides ±1.5% output voltage accuracy and consumes only 300μA quiescent current during normal operation and only 50μA during micropower start-up.

Using a 9.3V internal shunt regulator, the LTC3873-5 can be powered from a high input voltage through a resistor or it can be powered directly from a low impedance DC voltage of 9V or less.

Key Features

  • n VIN and VOUT Limited Only by External Components n Internal or Programmable External Soft-Start n Constant Frequency 200kHz Operation n Adjustable Current Limit n Current Sense Resistor Optional n ±1.5% Voltage Reference Accuracy n Current Mode Operation for Excellent Line and Load Transient Response n 4.1V Undervoltage Threshold for Logic Level MOSFET.

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