LM2577T-12/LF03

Description：IC REG BST FLYBCK 12V 3A TO220-5
Series：SIMPLE SWITCHER®
Mfr：Texas Instruments
Package：Tube

SKU:cbfbe8147f6d Category: Voltage Regulators - DC DC Switching Regulators Brand: Texas Instruments

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Product introduction

LM2577T-12/LF03 is listed in the Voltage Regulators - DC DC Switching Regulators range at ChipApex. The manufacturer field lists Texas Instruments. Its product description is IC REG BST FLYBCK 12V 3A TO220-5. Review the specifications below when checking this part for your BOM.

Voltage Regulators - DC DC Switching Regulators specifications for LM2577T-12/LF03

Description：IC REG BST FLYBCK 12V 3A TO220-5
Series：SIMPLE SWITCHER®
Mfr：Texas Instruments
Package：Tube
Function：Step-Up, Step-Up/Step-Down
Output Configuration：Positive
Topology：Boost, Flyback, Forward Converter
Output Type：Fixed
Number of Outputs：1
Voltage - Input (Min)：3.5V
Voltage - Input (Max)：40V
Voltage - Output (Min/Fixed)：12V
Voltage - Output (Max)：-
Current - Output：3A (Switch)
Frequency - Switching：52kHz
Synchronous Rectifier：No
Operating Temperature：-40°C ~ 125°C (TJ)
Mounting Type：Through Hole
Package / Case：TO-220-5 Formed Leads
Supplier Device Package：TO-220-5
Grade：-
Qualification：-

Voltage Regulators - DC DC Switching Regulators datasheet and documents for LM2577T-12/LF03

LM2577T-12/LF03

Voltage Regulators - DC DC Switching Regulators Overview

The LM2577T-12/LF03 is a monolithic integrated circuit from the SIMPLE SWITCHER series, functioning as a step-up, boost/buck, flyback, or forward switching regulator. It provides a fixed 12V output with a maximum switch current of 3A. The device operates with an input voltage range up to 40V and features a fixed internal oscillator frequency of 52kHz. Designed for through-hole mounting, it utilizes a TO-220-5 package with formed leads. The component supports positive or negative output configurations and includes fault protection mechanisms.

Voltage Regulators - DC DC Switching Regulators Feature Summary

Integrated high-frequency oscillator for simplified external component requirements
Capable of driving 3A load currents in various topologies including boost and buck
Includes built-in thermal shutdown and current limiting for system protection

Voltage Regulators - DC DC Switching Regulators Applications

Motor drive power supplies
Merchant network and server PSU
Appliance control circuits
Test and measurement equipment

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix LF03 against the manufacturer's official datasheet to confirm pinout compatibility and lead finish specifications. Confirm that the fixed 12V output variant meets the target application voltage requirements without modification. Ensure the TO-220-5 package dimensions align with the existing PCB footprint and thermal management design constraints.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 12V output is required for step-up or buck applications. It is suitable for designs needing 3A capacity with minimal external components. Consider the 52kHz switching frequency for inductor size trade-offs. Verify that the 40V maximum input voltage exceeds the source supply peak. Ensure the operating temperature range covers the environmental conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2577 family of adjustable and fixed-output switching regulators. It shares functional similarities with the LM2576 but offers different topology support such as flyback and forward converters. The LM2577 series is designed for high-efficiency power conversion with reduced component count compared to discrete solutions.