L4971

Voltage Regulators - DC DC Switching Regulators Overview

The L4971 is a monolithic step-down DC-DC converter delivering up to 1.5A output current with an input voltage range of 8V to 55V and adjustable output voltages from 3.3V to 50V. It operates at a switching frequency up to 300kHz using an internal power D-MOS transistor with a typical on-resistance of 0.25Ω. The device features a precise 3.3V internal reference, pulse-by-pulse current limiting, hiccup mode for short-circuit protection, thermal shutdown, and soft-start functionality. Available in DIP-8 and SO16W packages, it supports operation temperatures from -40°C to +150°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated high-efficiency power D-MOS transistor for high switching speed
• Comprehensive protection suite including thermal shutdown and hiccup mode
• Adjustable switching frequency up to 300kHz for optimized design flexibility
• Inhibit pin enables zero current consumption for low-power standby modes

Voltage Regulators - DC DC Switching Regulators Applications

• Development of asynchronous buck power supply circuits
• General-purpose DC-DC conversion in industrial equipment
• Power management systems requiring wide input voltage ranges

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific package variant required, as the L4971 family includes through-hole DIP-8 and surface-mount SO16W options. Confirm that the selected component matches the intended assembly method and thermal requirements. Ensure compatibility with the desired switching frequency and output voltage configuration before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select the L4971 when a robust, high-current buck regulator is needed for inputs up to 55V. Consider the SO16W package for surface-mount applications requiring higher thermal performance or space efficiency compared to the DIP-8. Evaluate the need for the inhibit feature if zero quiescent current is critical for the system's power budget.

Voltage Regulators - DC DC Switching Regulators Part Context

The L4971 belongs to STMicroelectronics' L497x series of switching regulators, designed for versatile power conversion tasks. It utilizes BCD mixed technology to integrate control logic with high-voltage power stages. This series targets applications demanding reliable step-down conversion with built-in protections against overcurrent and overheating conditions.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The L4971D013TR is the surface-mount equivalent of the L4971, offering identical electrical characteristics in an SO16W package. Verify pinout compatibility and thermal dissipation capabilities when substituting between DIP-8 and SO16W variants.