L4971D

Voltage Regulators - DC DC Switching Regulators Overview

The L4971D is a monolithic step-down switching regulator from STMicroelectronics, delivering up to 1.5A output current with an adjustable voltage range of 3.3V to 50V. It operates within an input voltage window of 8V to 55V and utilizes a fixed switching frequency of up to 300kHz. The device features a typical on-resistance of 0.25Ω for high efficiency and includes comprehensive protection mechanisms such as pulse-by-pulse current limiting, hiccup mode, thermal shutdown, and feedback disconnection detection. It is housed in a 16-pin SOIC package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated power D-MOS transistor enables high efficiency and fast switching speeds
• Built-in hiccup mode provides robust short-circuit protection
• Inhibit pin allows for zero current consumption during standby
• Voltage feedforward regulation maintains stability across wide input ranges

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial power supply systems requiring isolated or non-isolated buck conversion
• Embedded controller power distribution networks
• Battery-powered equipment utilizing wide input voltage ranges
• General-purpose DC-DC conversion in automotive environments

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'D' confirms the SOIC-16 surface-mount package variant rather than the DIP-8 through-hole version. Confirm RoHS compliance status via the official datasheet before integration. Ensure design accounts for thermal dissipation limits inherent to the plastic package at maximum load conditions.

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 1.5A continuous current with adjustable output voltages. Consider the SOIC-16 footprint constraints and verify that the 300kHz switching frequency aligns with EMI requirements and external component availability.

Voltage Regulators - DC DC Switching Regulators Part Context

The L4971D belongs to the L4971 family of monolithic DC-DC converters manufactured by STMicroelectronics. This series is designed for applications demanding high efficiency and compact solutions using BCD mixed technology. The L4971D specifically denotes the surface-mount variant, distinguishing it from other package options within the same functional family.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include the L4971 (DIP-8) for through-hole compatibility or the L4978D for higher current requirements in surface-mount packages. Verify pinout compatibility and thermal performance characteristics before swapping components in existing designs.