A5973AD

Voltage Regulators - DC DC Switching Regulators Overview

The A5973AD is a step-down monolithic power switching regulator designed for automotive applications, qualified under AEC-Q100 standards. It delivers up to 1.5 A DC output current with a minimum switch current limit of 1.8 A. The device operates within an input voltage range of 4 V to 36 V and supports adjustable output voltages from 1.235 V to the input voltage. Key electrical parameters include a fixed internal switching frequency of 500 kHz, a typical R DS(on) of 250 mΩ for the internal P-channel DMOS transistor, and a reference voltage of 3.3 V ± 2%. It functions in temperatures from -40°C to +150°C TJ.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Utilizes an HSOP-8 package with an exposed frame to achieve low thermal resistance of approximately 40 °C/W, supporting high current delivery.
• Features an internal P-channel DMOS switching element that eliminates the need for bootstrap capacitors, enabling 100% duty cycle operation.
• Includes pulse-by-pulse current limiting with internal frequency modulation for effective short-circuit protection.
• Provides comprehensive protection mechanisms including thermal shutdown, feedback disconnection protection, and inhibit functionality.

Voltage Regulators - DC DC Switching Regulators Applications

• Automotive systems requiring operation during cold crank conditions
• Step-down voltage regulation for electronic control units
• Power management in environments demanding AEC-Q100 qualification

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix (e.g., ADTR vs. AD) to confirm packaging format, as the base part number may correspond to different tape-and-reel or tube options depending on the distributor listing. Confirm AEC-Q100 qualification status and PPAP availability if required for your specific automotive application tier. Ensure the HSOP-EP-8 package footprint matches your PCB design constraints.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust, automotive-grade buck converter is needed with a 500 kHz fixed frequency. It is suitable for designs requiring low dropout performance and simplified external component counts due to the integrated P-channel MOSFET. Consider the thermal performance of the exposed pad package for high-current loads exceeding 1 A.

Voltage Regulators - DC DC Switching Regulators Part Context

The A5973AD belongs to the A5973 series of automotive step-down regulators. It shares architectural similarities with the L5973D but is distinguished by its AEC-Q100 qualification and optimized thermal characteristics for automotive reliability. It serves as a higher-frequency alternative to the 250 kHz A5972D within the same product family.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The A5972D is a confirmed substitute within the same family, offering similar 1.5 A capability but operating at a fixed 250 kHz frequency instead of 500 kHz. Both share the same input/output voltage ranges and automotive qualifications.