LM2587T-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM2587T-ADJ is a SIMPLE SWITCHER 5A flyback regulator from Texas Instruments, designed for boost and flyback converter applications. It operates with an input voltage range of 4V to 40V and features an adjustable output voltage starting from 1.23V. The device integrates a 5.0A, 65V NPN power switch and utilizes current-mode control for improved transient response. Key electrical parameters include a fixed 100 kHz switching frequency, internal soft-start functionality, and protection circuits for overcurrent, undervoltage lockout, and thermal shutdown.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 5.0A, 65V NPN power switch capable of handling high current loads in compact designs.
• Employs current-mode control architecture to enhance line regulation, load regulation, and loop stability.
• Includes built-in soft-start circuitry to limit inrush current during startup sequences.
• Provides comprehensive protection against overcurrent, thermal overload, and undervoltage conditions.

Voltage Regulators - DC DC Switching Regulators Applications

• Flyback converter designs requiring wide input voltage ranges
• Boost converters for step-up voltage applications
• Forward converter topologies in industrial power supplies
• Battery-powered systems needing efficient voltage regulation

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific package variant, as the LM2587 series includes both surface-mount (S) and through-hole (T) options. Confirm RoHS compliance status via the manufacturer's datasheet or official ordering information. Ensure the selected part number matches the required thermal performance and pin configuration for your PCB layout. Cross-reference with authorized distributors to confirm availability and authenticity before finalizing procurement decisions.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing flyback or boost converters requiring up to 5A output current. The adjustable output version allows flexibility in setting precise voltage levels using external resistors. Consider the 100 kHz switching frequency for balancing component size and efficiency. Ensure adequate heatsinking or thermal management due to the power dissipation associated with 5A operation. Verify that the input voltage range aligns with your system's supply characteristics.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM2587T-ADJ belongs to the SIMPLE SWITCHER family, which emphasizes ease of use with minimal external components. This specific model is the through-hole variant of the LM2587 series, offering robust performance for general-purpose power conversion. It complements other devices like the LM2586 and LM2588, providing scalable solutions for different current requirements within the same architectural framework.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct replacements may include LM2587T-5.0/NOPB for fixed voltage needs or LM2587S-ADJ/NOPB for surface-mount equivalents. Verify pin compatibility and thermal characteristics when substituting. Consult Texas Instruments documentation for updated alternatives if discontinuation occurs.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the minimum output voltage achievable with the LM2587T-ADJ?

The minimum output voltage is determined by the internal reference voltage of 1.23V, allowing adjustment down to this level using appropriate feedback resistors.

Does the LM2587T-ADJ support shutdown mode?

No, the standard LM2587T-ADJ does not include a dedicated shutdown pin. Models with shutdown capability are typically designated as LM2588.