LM2599S-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2599S-ADJ/NOPB is a SIMPLE SWITCHER® step-down switching regulator manufactured by Texas Instruments, continuing the legacy of National Semiconductor. It operates at a fixed 150 kHz switching frequency to minimize external filter component size. The device supports an input voltage range of 4.5 V to 40 V and provides an adjustable output voltage from 1.2 V to 37 V. It delivers a maximum output current of 3 A with high line and load regulation. The unit features internal frequency compensation and a fixed-frequency current mode control architecture for rapid transient response.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 3 A power switch for efficient step-down conversion
• Utilizes fixed-frequency current mode control for fast transient response
• Includes internal frequency compensation to reduce external component count
• Features thermal shutdown and current limit protection

Voltage Regulators - DC DC Switching Regulators Applications

• Distributed power supply systems requiring buck conversion
• Pre-regulators for linear post-regulator circuits
• Efficient on-card regulation for board-level DC/DC conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the ordering suffix /NOPB confirms lead-free and RoHS compliance status as per the manufacturer's datasheet. Confirm the package designation matches TO-263 (DDPAK-7) requirements for your PCB layout. Ensure the specific revision level aligns with your design specifications, as manufacturing sources may transition between National Semiconductor and Texas Instruments branding while maintaining functional equivalence.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a 3 A output current capability is required within a compact surface-mount footprint. The adjustable output version allows flexibility in setting precise voltage levels using external resistors. Consider the 150 kHz switching frequency trade-off between component size and electromagnetic interference compared to higher-frequency alternatives. Ensure the input voltage does not exceed the 40 V absolute maximum rating under all operating conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2599 series of SIMPLE SWITCHER regulators, which are designed to simplify power supply design through integrated control and power stages. The series includes fixed-voltage options alongside the adjustable variant. The device represents a transition from National Semiconductor to Texas Instruments product lines, retaining the core functionality and pinout compatibility established in the original National Semiconductor designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2599SX-ADJ/NOPB: Verified equivalent part number offering identical electrical characteristics and pinout configuration.