LM2599SX-5.0

Voltage Regulators - DC DC Switching Regulators Overview

The LM2599SX-5.0/NOPB is a SIMPLE SWITCHER power converter from Texas Instruments, functioning as a step-down voltage regulator with a fixed 5V output. It supports up to 3A load current within an input voltage range of 4.5V to 40V. Operating at a 150kHz switching frequency, it utilizes the TO-263 (D2PAK) surface-mount package. The device integrates internal frequency compensation and a fixed-frequency oscillator, requiring minimal external components for implementation.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a monolithic switching regulator designed to simplify DC-DC step-down converter design
• Includes internal fixed-frequency oscillator and frequency compensation to minimize external component count
• Features TTL-compatible shutdown capability for low-power standby operation
• Incorporates thermal shutdown and current limit protection for enhanced reliability

Voltage Regulators - DC DC Switching Regulators Applications

• Distributed power supply systems
• High-efficiency pre-regulators for linear regulators
• Battery-powered applications

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix NOPB indicates lead-free and RoHS compliance when sourcing. Confirm the SX variant corresponds to the D2PAK surface-mount package rather than through-hole options. Ensure the -5.0 designation matches the required fixed 5V output specification for the target circuit design.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component for designs requiring a 3A buck converter with minimal external parts. The 150kHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the thermal performance of the D2PAK package under high load conditions and ensure adequate PCB copper area for heat dissipation.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2599 series of SIMPLE SWITCHER regulators, which are widely used for efficient step-down conversion. The SX suffix specifically denotes the surface-mount D2PAK package, distinguishing it from the T-series through-hole variants. The -5.0 suffix identifies the fixed 5.0V output version within the family.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2596SX-5.0/NOPB offers similar functionality but with a 3A rating and slightly different electrical characteristics. LM2598SX-5.0/NOPB provides a 1A output option for lower current requirements. Verify pin compatibility and thermal specifications before substituting.