MC33567D-1R2G

Overview

The MC33567D-1R2G is a dual linear power supply controller designed for high-current voltage regulation in motherboard applications. It provides drive, sense, and control signals to interface with two external N-channel MOSFETs for regulating two distinct supply planes. The device features undervoltage short circuit detection and supply undervoltage detection. It operates within a supply voltage range of 9.0 V to 12.5 V DC and supports an operating ambient temperature from 0°C to 80°C. The component is housed in an SO-8 package.

Feature Summary

• Provides independent regulation for two different supply planes using external N-channel MOSFETs.
• Incorporates undervoltage short circuit protection that activates hiccup mode upon fault detection.
• Includes a bypass function for 3.3 V AGP card detection on Regulator 2.
• Features individual shutdown controls for each FET controller.

Applications

• Motherboard power management
• Dual power supplies
• High current voltage regulation

Procurement Notes

Verify the specific suffix 'R2' indicates tape and reel packaging and 'G' denotes lead-free finish as per official ordering information. Confirm availability status, as distribution channels may list this part as obsolete or discontinued. Ensure compatibility with required external N-channel MOSFETs for proper system stability and thermal performance.

Selection Notes

Select this controller when precise regulation of multiple supply planes is required for motherboard architectures. It is suitable for generating voltages such as 1.818 V and 1.515 V for GTL, AGP, and I/O planes. Designers must account for external MOSFET selection and output capacitor ESR requirements to ensure loop stability and meet thermal constraints.

Part Context

This component belongs to the MC33567 family of dual linear FET controllers manufactured by onsemi. The series includes variants with different fixed output voltages (e.g., MC33567D-2 for 2.525 V supplies). The MC33567D-1R2G specifically targets applications requiring 1.818 V and 1.515 V outputs, packaged in SO-8 format for surface mount integration.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Users should consult onsemi technical support for direct replacements or evaluate other members of the MC33567 family if voltage specifications differ.