LM2577T-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2577T-ADJ/NOPB is a SIMPLE SWITCHER power converter from Texas Instruments, utilizing internal fixed-frequency current-mode architecture to simplify design. It operates as an adjustable step-up, flyback, or forward converter with a switching frequency of 52 kHz. The device supports an input voltage range of 3.5 V to 40 V and delivers up to 3 A output current. It features an adjustable output voltage starting at 1.23 V, housed in a TO-220-5 through-hole package. The component is rated for operation between -40°C and +125°C junction temperature.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 52 kHz fixed-frequency oscillator for simplified external component selection
• Includes internal frequency compensation and current limiting for stable regulation
• Supports boost, flyback, and forward topologies within a single monolithic IC

Voltage Regulators - DC DC Switching Regulators Applications

• Distributed power supply systems requiring step-up conversion
• Battery-powered applications needing voltage boosting
• Negative voltage generation using flyback configurations

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'LF02' or 'NOPB' against the manufacturer's latest documentation, as legacy variants may have different pinout or thermal characteristics. Confirm RoHS compliance status directly with the supplier, as older production runs might differ. Ensure the TO-220-5 lead form matches the target PCB footprint requirements before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing non-isolated DC-DC converters requiring high efficiency and minimal external parts. The adjustable output variant allows flexibility for various load requirements compared to fixed-voltage versions. Consider the thermal performance of the TO-220-5 package for heat dissipation needs in high-current applications.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2577 series of SIMPLE SWITCHER regulators, designed for ease of use in power management circuits. The series includes fixed and adjustable output options in both surface-mount and through-hole packages. The LM2577 family is known for integrating the switch, controller, and freewheeling diode into a single chip.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2577T-ADJ/LF03 is documented as a parameter-equivalent substitute.