B5973DTR

Overview

The B5973DTR is a switching voltage regulator from STMicroelectronics, specifically a step-down (buck) converter. It features an internal P-channel D-MOS power switch with a minimum current limit of 2.5 A, enabling DC output currents exceeding 2 A depending on application conditions. The device operates with an input voltage range of 4 V to 36 V and provides an adjustable output voltage from 1.235 V to 35 V. It utilizes a fixed internal oscillator frequency of 250 kHz, though a synchronization pin allows for higher frequencies up to 700 kHz. The component is housed in an SO8 package with an exposed thermal pad.

Feature Summary

• Integrates a P-channel D-MOS power switch eliminating the need for bootstrap capacitors and supporting 100% duty cycle operation.
• Includes comprehensive protection mechanisms such as pulse-by-pulse current limiting, thermal shutdown, and feedback disconnection detection.
• Features an internal 250 kHz oscillator with a synchronization pin for external clocking up to 700 kHz.
• Provides low dropout performance and zero load current operation capability.

Applications

• 5 V bus applications in computer-related systems
• General purpose step-down DC-DC conversion
• Embedded power supply designs requiring high efficiency

Procurement Notes

Verify the exact suffix against official STMicroelectronics documentation to confirm tape-and-reel packaging specifications. Ensure the ordering part number matches the required thermal and electrical characteristics. Cross-reference datasheet revision levels to confirm compatibility with design requirements before finalizing procurement orders.

Selection Notes

Select this component when a robust buck converter with high peak current capability is needed for 5 V bus architectures. The exposed pad package is suitable for applications requiring efficient thermal dissipation. Consider the synchronization feature if system noise immunity requires frequency adjustment beyond the default 250 kHz setting.

Part Context

This part belongs to the L5973D series of monolithic power switching regulators. It is designed for high-current applications where size reduction and efficiency are critical. The series leverages BCD5 technology to integrate control logic and power stages into a compact footprint.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Consult official manufacturer cross-reference lists for verified alternatives.