LTC3805HMSE#TR

DC DC Switching Controllers Overview

The LTC3805HMSE#TR is an adjustable frequency current mode DC/DC controller designed for flyback, boost, and SEPIC converter applications. It drives N-channel MOSFETs with a switching frequency range of 70kHz to 700kHz. The device features programmable slope compensation and overcurrent sensing. It operates from a supply voltage of 4.7V to 8.8V or via a high VIN through a resistor using an internal 9.5V shunt regulator. Quiescent current is 360μA during normal operation and 40μA during micropower startup. It provides ±1.5% output voltage accuracy and is housed in a 10-lead MSOP package.

DC DC Switching Controllers Feature Summary

• Supports flyback, boost, and SEPIC topologies with external programming of operating frequency and slope compensation.
• Includes programmable overcurrent sensing to protect against overload and short-circuit conditions.
• Features a soft-start function programmed by an external capacitor that also enables automatic restart.

DC DC Switching Controllers Applications

• Flyback converter designs
• Boost converter circuits
• SEPIC (Single Ended Primary Inductor Converter) applications

DC DC Switching Controllers Procurement Notes

Verify the specific suffix '#TR' indicates tape and reel packaging when ordering. Confirm the 'H' grade corresponds to the required industrial temperature range (-40°C to +85°C). Ensure the pinout matches the 10-MSOP-EP package specification. Cross-reference the datasheet revision to confirm compatibility with existing design files.

DC DC Switching Controllers Selection Notes

Select this component for isolated or non-isolated converters requiring adjustable frequency control. It is suitable for applications needing low quiescent current and precise output regulation. Consider the external component requirements for setting frequency and soft-start timing. Evaluate the thermal performance within the MSOP package for the intended power levels.

DC DC Switching Controllers Part Context

This part belongs to the LTC3805 family of current mode controllers manufactured by Analog Devices Inc. It shares core functionality with variants like the LTC3805EMSE#PBF but differs in packaging format and temperature grade. The family is designed for versatile DC/DC conversion topologies.

DC DC Switching Controllers Replacement Considerations

Direct substitutes include other LTC3805 variants such as LTC3805EMSE#PBF or LTC3805IMSE#PBF, provided the package and temperature specifications align with the design requirements. Verify pin compatibility before substitution.

DC DC Switching Controllers FAQ

How is the switching frequency determined?

The operating frequency is programmed by an external resistor connected to the device.

What is the purpose of the soft-start capacitor?

It programs the soft-start time and enables an automatic restart feature after fault conditions.