ADI LTC3805EMSE-5#PBF

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.

• 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
• ±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

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