L4976

Voltage Regulators - DC DC Switching Regulators Overview

The L4976D013TR is a monolithic step-down switching regulator from STMicroelectronics, delivering up to 1A output current. It operates with an input voltage range of 8V to 55V and provides an adjustable output voltage between 0.5V and 50V. The device utilizes BCD mixed technology with an internal power D-MOS transistor featuring a typical Rds(on) of 0.25Ω. It supports a switching frequency up to 300kHz and includes protection features such as pulse-by-pulse current limit, hiccup mode for short circuits, thermal shutdown, and feedback 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 for high efficiency and fast switching speeds within a compact monolithic design.
• Provides comprehensive protection mechanisms including hiccup mode for short circuit handling and thermal shutdown.
• Includes voltage feedforward regulation and specific safeguards against feedback loop disconnection.

Voltage Regulators - DC DC Switching Regulators Applications

• General-purpose DC-DC conversion systems requiring wide input voltage ranges
• Embedded power management solutions utilizing the SO16W surface-mount package
• Industrial applications needing robust short-circuit and thermal protection

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the exact suffix (e.g., D013TR) to confirm the specific packaging format, such as tape and reel quantities. Ensure compatibility with the 16-SOIC footprint during PCB layout. Confirm RoHS compliance status if required by specific environmental regulations. Cross-reference the manufacturer part number with distributor codes to avoid ordering errors related to different package variants or temperature grades.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a single-output buck converter with a wide 8V to 55V input range is required. It is suitable for designs needing up to 1A continuous current with adjustable output voltages down to 0.5V. Consider the SO16W package for surface-mount assembly requirements. Evaluate the 300kHz maximum switching frequency against external component size constraints and thermal dissipation capabilities of the chosen package.

Voltage Regulators - DC DC Switching Regulators Part Context

The L4976 belongs to a family of step-down switching regulators that utilize BCD mixed technology. Similar devices in the series include the L4978, which offers higher current capability, and the L4972, which is an older generation variant. These components share common design philosophies regarding efficiency and protection features but differ in output current ratings and specific package options available for standard or SMD assembly.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The L4978 is a direct functional alternative offering 2A output capability with similar input/output specifications and protection features. Designers should verify pinout compatibility and thermal performance differences when substituting the L4976 with the L4978. Other members of the L497x family may require schematic adjustments due to varying current limits or reference voltages.