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LTC3805IMSE-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.

Specifications Of LTC3805IMSE-5

Output Type:Transistor Driver

Function:Step-Up, Step-Up/Step-Down

Output Configuration:Positive, Isolation Capable

Topology:Boost, Flyback, SEPIC

Number of Outputs:1

Output Phases:1

Voltage - Supply (Vcc/Vdd):3.95V ~ 9.5V

Frequency - Switching:70kHz ~ 700kHz

Duty Cycle (Max):80%

Synchronous Rectifier:No

Clock Sync:Yes

Control Features:Enable, Soft Start

Operating Temperature:-40°C ~ 125°C (TJ)

Features Of LTC3805IMSE-5

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

Applications Of LTC3805IMSE-5

Automotive Power Supplies

Telecom Power Supplies

Isolated Electronic Equipment

Auxiliary/Housekeeping Power Supplies

Power over Ethernet

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