LM2598S-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM2598S-ADJ/NOPB is a SIMPLE SWITCHER power converter from Texas Instruments, functioning as an adjustable step-down voltage regulator. It accepts an input voltage range of 4.5 V to 40 V and delivers a maximum output current of 1 A. The device operates at a fixed switching frequency of 150 kHz and utilizes a TO-263 (D2PAK) surface-mount package with seven pins. It supports an adjustable output voltage range typically from 1.23 V to 37 V. The component is rated for operation between -40 °C and +125 °C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated monolithic controller simplifies design by requiring only external pass transistor, diode, and inductor
• Internal compensation network ensures stability across the full operating temperature range
• Built-in thermal shutdown circuit protects against overheating during fault conditions
• Fixed 150 kHz switching frequency allows use of small passive components

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for distributed power systems
• Pre-regulator circuits for switch-mode power supplies
• Efficient buck converters for battery-powered equipment
• Linear regulator replacement where dropout voltage is critical

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix NOPB indicates lead-free status and RoHS compliance when sourcing. Confirm the ADJ designation matches the required adjustable output topology rather than fixed voltage variants. Ensure the TO-263 package footprint aligns with PCB layout specifications. Cross-reference manufacturer datasheets for latest revision history and environmental certifications before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when input voltages exceed 40 V or when higher efficiency than linear regulators is needed. The 1 A current limit suits moderate load applications without excessive heat sinking. Consider the 150 kHz frequency trade-off between component size and electromagnetic interference. Verify that the external pass transistor can handle the required current and voltage stress for the specific application environment.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM2598 series belongs to Texas Instruments' SIMPLE SWITCHER family, designed for easy implementation of DC-DC conversion. Unlike the LM2596 which integrates the pass transistor, the LM2598 requires an external NPN pass transistor, offering flexibility in handling higher currents or different voltage configurations while maintaining the same control architecture and switching characteristics.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2598S-5.0/NOPB serves as a direct pin-compatible alternative if a fixed 5 V output is acceptable instead of adjustable. LM2596S-ADJ/NOPB offers integrated pass transistor functionality but differs in internal architecture and thermal performance requirements.