L5973ADTR

Voltage Regulators - DC DC Switching Regulators Overview

The L5973ADTR is a step-down monolithic power switching regulator manufactured by STMicroelectronics. It 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. The device features an internal P-Channel D-MOS transistor with a typical on-resistance of 200 mΩ, eliminating the need for a bootstrap capacitor. It supports a switch current limit of 2 A and delivers up to 1.5 A DC load current. The internal oscillator fixes the switching frequency at 500 kHz. It includes pulse-by-pulse current limiting, thermal shutdown, and feedback disconnection protection. The component is housed in an HSOP-8 package with an exposed frame for improved thermal performance.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Internal P-Channel D-MOS switching element eliminates bootstrap capacitor requirement
• Pulse-by-pulse current limiting with internal frequency modulation for short-circuit protection
• Thermal shutdown and protection against feedback disconnection
• Low dropout operation enabling 100% duty cycle

Voltage Regulators - DC DC Switching Regulators Applications

• Computer-related applications utilizing 5 V bus architectures
• Automotive electronic systems requiring cold crank operation
• General-purpose DC/DC conversion for embedded systems

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'TR' indicates tape and reel packaging configuration distinct from tube variants. Confirm RoHS compliance status and moisture sensitivity level (MSL 3) requirements for surface mount assembly processes. Ensure the ordering part number matches the exact electrical specifications and package type required for the design.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a buck converter topology is required with an input voltage up to 36 V. It is suitable for designs needing a fixed 500 kHz switching frequency to minimize external passive component size. Consider the exposed pad thermal characteristics for high-current applications where heat dissipation is critical within the HSOP-8 footprint.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the L5973 series of step-down switching regulators. It shares functional similarities with the L5973D but specifies a 500 kHz internal oscillator frequency compared to other variants. The 'A' prefix may denote automotive qualification or specific manufacturing lot attributes, while 'TR' denotes the reel packaging format.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The L5973D serves as a direct functional alternative within the same product family. Verify that the switching frequency difference (500 kHz vs 250 kHz) aligns with existing filter component designs.