L4976D

Voltage Regulators - DC DC Switching Regulators Overview

The L4976D is a monolithic step-down switching regulator IC from STMicroelectronics, delivering up to 1A output current. It operates with an input voltage range of 8V to 55V and provides adjustable output voltages from 0.5V to 50V. The device utilizes an internal power D-MOS transistor for high efficiency and supports switching frequencies up to 300kHz. It features pulse-by-pulse current limiting, hiccup mode for short-circuit protection, thermal shutdown, and feedback loop disconnection protection. The component is housed in a 16-SOIC (SO16W) surface-mount package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates an internal power D-MOS transistor to achieve high conversion efficiency and fast switching speeds.
• Includes comprehensive protection mechanisms such as pulse-by-pulse current limiting, hiccup mode for short circuits, and thermal shutdown.
• Features voltage feedforward regulation and specific safeguards against feedback loop disconnection.

Voltage Regulators - DC DC Switching Regulators Applications

• General-purpose DC-DC step-down conversion
• Embedded system power supplies
• Industrial control unit power regulation

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the exact suffix designation when ordering, as packaging options like tube or reel may vary by distributor. Confirm RoHS compliance status and moisture sensitivity level requirements prior to assembly. Ensure the selected variant matches the required operating temperature range and package dimensions for your PCB layout.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component for applications requiring a wide input voltage range up to 55V and an output current of 1A. Consider the SO16W package for surface-mount designs. Evaluate the need for external frequency adjustment if operation above 300kHz is not required, as higher frequencies increase power dissipation constraints.

Voltage Regulators - DC DC Switching Regulators Part Context

The L4976 belongs to a family of BCD mixed technology switching regulators designed for robust performance in demanding environments. It serves as a non-synchronous buck converter solution, distinct from synchronous variants that offer lower Rds(on) but different control complexities. This part is suitable for standard industrial and commercial power management tasks.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct pin-compatible substitutes within the same series include the L4976D013TR, which shares identical electrical characteristics but differs in tape-and-reel packaging. Other L497x series devices may offer different current ratings or fixed output voltages but require circuit re-evaluation.