LM2598SX-5.0

Voltage Regulators - DC DC Switching Regulators Overview

The LM2598SX-5.0/NOPB is a SIMPLE SWITCHER® step-down switching regulator from Texas Instruments, designed for high-efficiency DC/DC conversion. It operates with an input voltage range of 4.5V to 40V and provides a fixed 5V output at up to 1A. The device integrates a 150kHz oscillator for external component reduction and includes internal frequency compensation. Key electrical parameters include a maximum input voltage of 40V, minimum input voltage of 4.5V, fixed output voltage of 5V, output current of 1A, switching frequency of 150kHz, and junction temperature operating range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a monolithic switching regulator with built-in frequency compensation for simplified design
• Features a fixed 150kHz switching frequency to minimize passive component size
• Includes internal thermal shutdown and current limiting for robust protection
• Offers adjustable output voltage capability via external resistor divider

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for distributed power systems
• Pre-regulators for post-switching regulators
• Efficient buck converters for battery-powered applications

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix 'NOPB' confirms lead-free/RoHS compliance as per Texas Instruments specifications. Confirm the 'SX' package designation matches the required TO-263 (D2PAK) surface-mount footprint. Ensure the '-5.0' indicates the fixed 5V output variant. Cross-reference the manufacturer part number against the official TI datasheet to validate pinout and electrical characteristics before integration.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 5V output is required from an input voltage between 4.5V and 40V with a load current up to 1A. The TO-263 package provides adequate thermal performance for moderate power dissipation without requiring extensive heatsinking in typical applications. Consider the 150kHz switching frequency for balancing efficiency and component size. Verify that the application does not require synchronous rectification or higher current capabilities exceeding 1A.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2598 family of SIMPLE SWITCHER® regulators, which are known for ease of use and minimal external components. It is distinct from the LM2596 (higher current, different pinout) and LM2599 (higher current, similar topology). The SX suffix denotes the surface-mount D2PAK package, differing from the through-hole T (TO-220) variant. The NOPB suffix indicates non-pb-free versions are excluded, ensuring environmental compliance.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2598S-5.0/NOPB is the through-hole equivalent with identical electrical specifications but a different package. LM2596S-5.0/NOPB offers higher current capacity (3A) but requires layout adjustments due to pinout differences. LM2599SX-5.0/NOPB provides 3A output but may have different thermal characteristics. Direct pin-to-pin replacement with other families is not guaranteed; verify schematic compatibility.