LM2577T-ADJ/LB03

Voltage Regulators - DC DC Switching Regulators Overview

The LM2577T-ADJ/LB03 is a SIMPLE SWITCHER step-up DC/DC switching regulator manufactured by Texas Instruments. It operates with an input voltage range of 3.5V to 40V and provides a single adjustable output starting from 1.23V, capable of delivering up to 3A switch current. The device utilizes a fixed 52kHz switching frequency and supports boost, flyback, and forward converter topologies. It is housed in a TO-220-5 through-hole package with formed leads and functions within a junction temperature range of -40°C to 125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated monolithic power switch eliminates the need for external components typically required in discrete designs.
• Fixed internal oscillator ensures stable operation without requiring external timing components.
• Built-in thermal shutdown circuitry protects the device against excessive heat during overload conditions.

Voltage Regulators - DC DC Switching Regulators Applications

• Distributed power supply systems requiring step-up conversion
• Battery-powered applications needing voltage boosting
• General-purpose positive or negative adjustable voltage regulators

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify component authenticity as this part number may be obsolete. Confirm that the LB03 suffix corresponds to the specific tape-and-reel packaging variant if applicable, though standard documentation often lists LF02 for tube packaging. Ensure the replacement matches the exact pinout and electrical specifications to avoid board redesign.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this regulator when a robust, high-current step-up solution is required in a through-hole package. The adjustable output allows flexibility for various voltage requirements. Consider the 52kHz switching frequency for EMI constraints and ensure adequate heatsinking due to the TO-220-5 form factor and 3A capability.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM2577 family of SIMPLE SWITCHER regulators, designed for straightforward implementation of non-isolated DC/DC converters. The family includes fixed voltage variants and adjustable versions, offering a balance of performance and ease of use for industrial and commercial power management tasks.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2577T-ADJ/LF02 is listed as a parameter-equivalent alternative from Texas Instruments. Verify compatibility regarding packaging type and suffix definitions before substitution.