LM2599S-12

Voltage Regulators - DC DC Switching Regulators Overview

The LM2599S-12 is a SIMPLE SWITCHER step-down voltage regulator IC manufactured by Texas Instruments, originally part of the National Semiconductor portfolio. It operates at a fixed switching frequency of 150 kHz and provides a fixed output voltage of 12 V with a maximum output current capability of 3 A. The device accepts an input voltage range from 4.5 V to 40 V. It utilizes a TO-263 (D2PAK) surface-mount package and supports operation temperatures from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated monolithic buck converter topology for efficient DC-DC step-down conversion
• Fixed 12 V output configuration eliminating external feedback resistor networks
• Built-in thermal shutdown and current limiting protection mechanisms

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation in distributed power architectures
• Pre-regulator stages for linear post-regulators
• Efficient step-down conversion from higher bus voltages

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify manufacturer origin as Texas Instruments acquired National Semiconductor. Confirm RoHS compliance status via official datasheet. Ensure package marking matches TO-263 specifications. Cross-reference ordering suffixes such as NOPB for lead-free variants against current production status.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 12 V output is required with up to 3 A load capacity. The 150 kHz frequency allows for smaller passive components compared to lower-frequency regulators. Verify input voltage does not exceed 40 V and ensure adequate thermal management for the TO-263 package under high load conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2599 series of SIMPLE SWITCHER regulators. It shares architectural similarities with the LM2596 but offers higher output current capability. The family is designed for straightforward implementation with minimal external components, serving as a standard solution for medium-power buck applications.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2599S-12/NOPB is the direct equivalent with lead-free construction. LM2596S-12 offers similar functionality but with reduced 1 A output current. LM2595S-12 provides comparable performance with 1 A output capability.