E-L5972D

Overview

The L5972D is a step-down monolithic power switching regulator featuring an internal P-Channel D-MOS transistor with a typical Rdson of 250mΩ. It provides a minimum switch current limit of 2A, delivering over 1.5A DC to the load. The output voltage is adjustable from 1.235V to 35V, while the operating input voltage ranges from 4.4V to 36V. An internal oscillator sets the switching frequency at 250kHz. The device supports low dropout operation with a 100% duty cycle and includes thermal shutdown, feedback disconnection protection, and zero load current operation.

Feature Summary

• Integrates a 2A internal switch using P-Channel D-MOS technology to minimize external component size.
• Provides effective constant current short circuit protection via pulse-by-pulse current limiting and internal frequency modulation.
• Supports low dropout operation with a 100% duty cycle for efficient performance near input voltage levels.

Applications

• Computer-related applications utilizing 5V bus architectures
• General-purpose step-down DC/DC conversion systems
• Power supply designs requiring adjustable output voltages

Procurement Notes

Verify the specific package variant, such as SO8N tube or T/R tape-and-reel configurations, against project requirements. Confirm that the industrial grade temperature range meets operational needs. Ensure design tools like eDesignSuite are utilized for accurate PCB layout and component selection to maintain stability.

Selection Notes

Select this regulator for applications requiring up to 1.5A continuous output current with a fixed 250kHz switching frequency. It is suitable for 5V bus systems due to its low minimum input voltage. Consider the exposed pad thermal performance if high ambient temperatures are expected, as thermal management impacts sustained current delivery.

Part Context

The L5972D belongs to STMicroelectronics' family of monolithic step-down switching regulators. It shares architectural similarities with the L5970D and L5973D but offers distinct current handling capabilities. This component targets industrial and computer applications where compact size and reliable regulation are prioritized over automotive qualification standards found in the A5972D series.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult official ST resources for cross-reference data when evaluating alternative components for system upgrades or obsolescence management.