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 VIN 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 * VIN and VOUT 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 https://elecena.pl/product/642958/adjustable-frequency-current-mode-flyback-boost-sepic-dc-dc-controller 2008-05-09 https://elecena.pl/product/642958/adjustable-frequency-current-mode-flyback-boost-sepic-dc-dc-controller 2017-10-09 https://elecena.pl/product/642958/adjustable-frequency-current-mode-flyback-boost-sepic-dc-dc-controller 2025-01-20