LTC3805-5

PRODUCTION

Adjustable Frequency Current Mode Flyback/Boost/SEPIC DC/DC Controller

Analog Devices LTC3805-5 Product Info

10 February 2026 5

Features

V_IN and V_OUT Limited Only by External Components
4.5V Undervoltage Lockout Threshold
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
Only 100mV Current Sense Voltage Drop
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 LTC3805-5 is a current mode DC/DC controller designed to drive an N-channel MOSFET in flyback, boost and SEPIC converter applications. Operating frequency and slope compensation can be programmed by external resistors. Programmable overcurrent sensing protects the converter from overload and short-circuit conditions. Soft-start can be programmed using an external capacitor and the soft-start capacitor also programs an automatic restart feature.

The LTC3805-5 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 LTC3805-5 can be powered from a high V_IN through a resistor or it can be powered directly from a low impedance DC voltage from 4.7V to 8.8V.

The LTC3805-5 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

Automotive Power Supplies
Telecom Power Supplies
Isolated Electronic Equipment
Auxiliary/Housekeeping Power Supplies
Power over Ethernet

Subscribe to Welllinkchips !

Your Name

* Email