LM2577T-ADJ/LF02

Voltage Regulators - DC DC Switching Regulators Overview

The LM2577T-ADJ/LF02 is a SIMPLE SWITCHER power regulator IC manufactured by Texas Instruments, housed in a TO-220-5 through-hole package. It functions as an adjustable step-up, flyback, or forward converter with a maximum input voltage of 40V and a minimum input voltage of 3.5V. The device provides a single positive output ranging from 1.23V to 60V (switch) with a switch current capacity of 3A. Operating at a fixed switching frequency of 52kHz, it supports junction temperatures between -40°C and 125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated monolithic switching regulator designed for boost, flyback, and forward topologies
• Fixed internal oscillator operating at 52kHz to minimize external component count
• Built-in temperature-compensated reference voltage for precise output regulation
• Includes internal frequency compensation and current limit circuitry

Voltage Regulators - DC DC Switching Regulators Applications

• Distributed power systems requiring step-up conversion
• Battery-powered applications utilizing flyback or forward converters
• Positive or negative regulated supplies derived from standard 5V inputs
• Pre-regulators for downstream switching regulators

Voltage Regulators - DC DC Switching Regulators Procurement Notes

This specific part number is obsolete and no longer manufactured by Texas Instruments. Verification of availability should focus on the designated parameter-equivalent replacement, LM2577T-ADJ/LF03. Ensure that any sourced units are confirmed as direct functional substitutes compatible with the original design specifications before procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component for designs requiring a robust 3A adjustable switching regulator in a through-hole package. It is suitable for applications needing high efficiency with minimal external components. Consider the LM2577SX-ADJ variant if surface-mount installation is required instead of the TO-220 form factor.

Voltage Regulators - DC DC Switching Regulators Part Context

Part of the SIMPLE SWITCHER family, the LM2577 series integrates the controller, driver, and power switch into a single monolithic IC. This integration simplifies the design of DC-DC converters by reducing the number of required external passive components while maintaining high performance and reliability standards.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LM2577T-ADJ/LF03 is the confirmed parameter-equivalent replacement for this obsolete part number.