LM2673LD-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM2673LD-ADJ is a step-down switching regulator IC from the SIMPLE SWITCHER® series, manufactured by National Semiconductor. It operates with an input voltage range of 8V to 40V and provides a continuously adjustable output voltage between 1.2V and 37V. The device delivers a maximum output current of 3A with a fixed switching frequency of 260kHz. It utilizes a 14-VSON (6x5) package with a bare pad for thermal dissipation. The component supports positive output configuration and functions as a non-synchronous buck converter. It is rated for operation across a junction temperature range of -40°C to 125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated high-current internal switch capable of delivering up to 3A load current
• Fixed 260kHz switching frequency enables the use of small external passive components
• Adjustable output voltage range allows flexibility for various system requirements
• Built-in thermal shutdown and current limit protection for enhanced reliability

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation in distributed power supply architectures
• Battery-powered equipment requiring efficient voltage conversion
• Industrial control systems operating within wide input voltage ranges
• Embedded systems needing stable 5V or 3.3V rails from higher bus voltages

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin carefully, as National Semiconductor assets were acquired by Texas Instruments. Confirm RoHS compliance status, as original NS versions may not meet current environmental standards. Check part status for obsolescence, as many variants are discontinued. Ensure the specific suffix matches the required package and pinout. Validate that the supplier provides genuine components with traceable documentation.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust 3A buck converter is needed with minimal external parts. The 260kHz frequency balances efficiency and component size effectively. Consider the 14-VSON package for space-constrained PCB layouts. Ensure the input voltage never exceeds 40V to prevent damage. Verify that the thermal design accommodates the power dissipation at the expected load and ambient conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2673 family of simple switcher regulators. It shares architectural similarities with the LM2672 and LM2676 but offers specific current and package variations. The LM2673 series is designed for ease of use with few external components. It serves as a direct replacement for older linear regulators in applications requiring higher efficiency.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the minimum input voltage required for the LM2673LD-ADJ?

The minimum input voltage is 8V.

Can the output voltage be adjusted below 1.2V?

No, the adjustable output voltage range starts at 1.2V.

Is the LM2673LD-ADJ a synchronous rectifier?

No, it uses a non-synchronous topology with an internal N-channel MOSFET switch.