LTC3805EMSE

DC DC Switching Controllers Overview

The LTC3805EMSE is a current mode DC/DC controller designed for flyback, boost, and SEPIC converter applications. It drives an N-channel MOSFET with an adjustable switching frequency ranging from 70 kHz to 700 kHz. The device provides ±1.5% output voltage accuracy and features programmable overcurrent sensing for protection against overload and short-circuit conditions. Quiescent current consumption is 360 μA during normal operation and 40 μA during micropower startup. It supports input voltages from 4.7V to 8.8V or via a high V through a resistor using an internal shunt regulator.

DC DC Switching Controllers Feature Summary

• Supports flyback, boost, and SEPIC topologies for versatile power conversion
• Features programmable soft-start with automatic restart capability
• Includes built-in overcurrent sensing for circuit protection
• Offers low quiescent current modes for energy efficiency

DC DC Switching Controllers Applications

• Telecommunications isolated DC/DC converters
• Non-isolated SEPIC DC/DC converters
• Boost converter designs
• Flyback converter applications

DC DC Switching Controllers Procurement Notes

Verify the specific suffix of the part number when ordering. The base model designation may include additional characters indicating package type, temperature range, or tape/reel configuration. Confirm that the selected variant matches the required operating temperature range and physical footprint specifications for the target design.

DC DC Switching Controllers Selection Notes

Select this controller for applications requiring flexible topology support including flyback, boost, and SEPIC configurations. Ensure the external component selection aligns with the desired switching frequency range between 70 kHz and 700 kHz. Consider the low quiescent current requirements if battery life or standby power efficiency is a critical design constraint.

DC DC Switching Controllers Part Context

This component belongs to the LTC3805 series of adjustable frequency current mode controllers manufactured by Analog Devices Inc. The series is engineered for driving N-channel MOSFETs in various non-isolated and isolated power supply architectures. It is commonly evaluated using demonstration circuits such as the DC1576A for SEPIC and DC1311A-B for flyback topologies.

DC DC Switching Controllers Replacement Considerations

LTC3805HMSE#PBF

DC DC Switching Controllers FAQ

What are the supported converter topologies for the LTC3805?

The LTC3805 is designed to drive N-channel MOSFETs in flyback, boost, and SEPIC converter applications.

How is the switching frequency controlled?

Operating frequency and slope compensation can be programmed by external resistors, allowing adjustment over a range of 70 kHz to 700 kHz.