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LTC3873 - No RSENSE Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller

The LTC3873 is a constant frequency, current mode, boost, flyback or SEPIC DC/DC controller that drives an N-channel power MOSFET in high input and output voltage converter applications. Soft-start can be programmed using an external capacitor.

The LTC3873 provides ±1.5% output voltage accuracy and consumes only 300μA quiescent current during normal operation and only 55μA during micropower start-up. Using a 9.3V internal shunt regulator, the LTC3873 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.

The LTC3873 is available in 8-lead ThinSOT and 2mm x 3mm DFN packages.

Features VIN and VOUT Limited Only by External Components Internal or Programmable External Soft-Start Constant Frequency 200kHz Operation Adjustable Current Limit Current Sense Resistor Optional Maximum 60V on SW Node with RDS(ON) Sensing ±1.5% Voltage Reference Accuracy Current Mode Operation for Excellent Line and Load Transient Response Low Quiescent Current: 300µA Low Profile (1mm) ThinSOT and (0.75mm) 2mm × 3mm DFN Package Typical Application

Applications Telecom Power Supplies 42V and 12V Automotive Power Supplies Portable Electronic Equipment Packaging

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