LTC3805

PRODUCTION

Adjustable Frequency Current Mode Flyback DC/DC Controller

Analog Devices LTC3805 Product Info

10 February 2026 5

Features

V_IN and V_OUT Limited Only by External Components
Adjustable Slope Compensation
Adjustable Overcurrent Protection with Automatic Restart
Adjustable Operating Frequency (70kHz to 700kHz) with One External Resistor
Synchronizable to an External Clock
±1.5% Reference Accuracy

Current Mode Operation for Excellent Line and Load Transient Response
RUN Pin with Precision Threshold and Adjustable Hysteresis
Programmable Soft-Start with One External Capacitor
Low Quiescent Current: 360μA
Small 10-Lead MSOP and 3mm × 3mm DFN

Part details & applications

The LTC3805 is a current mode controller for flyback DC/DC converters designed to drive an N-channel MOSFET in high input and output voltage converter applications. Operating frequency and slope compensation can be programmed by external resistors. Programmable overcurrent sensing protects the converter from short-circuits. Soft-start can be programmed using an external capacitor and the soft-start capacitor also programs an automatic restart feature.

The LTC3805 provides ±1.5% output voltage accuracy and consumes only 360μA of quiescent current during normal operation and only 40μA during micropower startup. Using a 9.5V internal shunt regulator, the LTC3805 can be powered from a high V_IN through a resistor or it can be powered directly from a low impedance DC voltage of 9V or less.

The LTC3805 is available in the 10-lead MSOP package and the 3mm × 3mm DFN package.

	Turn On Voltage
LTC3805	8.4V
LTC3805-5	4.5V

Applications

Telecom Power Supplies
42V and 12V Automotive Power Supplies
Isolated Electronic Equipment

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