LT3757IMSE

Overview

The LT3757IMSE is a wide input voltage, current mode DC/DC controller manufactured by Analog Devices Inc. It supports Boost, Flyback, SEPIC, and Inverting topologies with a single output. The device operates within an input voltage range of 2.9V to 40V and features a programmable switching frequency from 100kHz to 1MHz. It includes an internal 7.2V LDO for driving external N-channel MOSFETs. The component is housed in a 10-MSOP-EP package and functions across a temperature range of -40°C to +125°C.

Feature Summary

• Supports multiple converter topologies including Boost, Flyback, SEPIC, and Inverting configurations
• Integrates a 7.2V low-dropout regulator for direct drive of external N-channel power MOSFETs
• Features programmable soft start, hysteresis input undervoltage lockout, and frequency foldback protection

Applications

• Industrial equipment power management
• Automotive electronics systems
• Communication base station supplies
• Battery-powered system regulation

Procurement Notes

Verify the specific suffix TRPBF indicates tape and reel packaging when sourcing. Confirm RoHS compliance status through official documentation. Check availability as supply may be limited or subject to factory special orders. Ensure the 10-MSOP-EP package matches the design requirements. Validate that the manufacturer is Analog Devices Inc. prior to ordering.

Selection Notes

Select this controller for applications requiring wide input voltage ranges up to 40V. Choose the IMSE variant for surface mount assembly in compact designs. Consider the 100kHz to 1MHz frequency range for balancing efficiency and size. Verify compatibility with external N-channel MOSFETs driven by the internal 7.2V supply. Ensure thermal performance meets the -40°C to +125°C operating environment.

Part Context

The LT3757 series was originally introduced by Linear Technology, which later became part of Analog Devices Inc. This family of controllers is designed for high-efficiency power conversion in demanding environments. The IMSE designation specifies the MSOP package with exposed pad for improved thermal dissipation. It serves as a versatile solution for various isolated and non-isolated power architectures.

Replacement Considerations

LT3757A

FAQ

What is the function of the internal 7.2V regulator?

It provides a stable voltage source to drive the gates of external N-channel power MOSFETs.

How is the switching frequency determined?

The frequency is programmable via an external resistor, allowing adjustment between 100kHz and 1MHz.