MC33567D-1R2

Overview

The MC33567D-1R2 is a dual linear power supply controller designed for high-current voltage regulation in motherboard applications. It interfaces with two external N-channel MOSFETs to regulate separate supply planes. The device provides independent drive, sense, and control signals for Regulator 1 (1.818 V) and Regulator 2 (1.515 V or Vin bypass). It features undervoltage short circuit detection, supply undervoltage lockout, and shutdown controls. Operating within an ambient temperature range of 0°C to 80°C, it utilizes an SO-8 surface-mount package.

Feature Summary

• Dual independent regulated supplies for distinct voltage planes
• Integrated undervoltage short circuit protection with hiccup mode
• Bypass function for AGP card detection on Regulator 2
• Drive capability specifically optimized for N-channel MOSFETs

Applications

• Motherboard power management systems
• GTL and AGP plane voltage regulation
• I/O plane and memory termination power supplies

Procurement Notes

Verify the specific suffix R2 indicates tape and reel packaging when sourcing components. Confirm RoHS compliance status by checking for the G-suffix designation if lead-free requirements are mandatory for the assembly process. Ensure the ordering information matches the required output voltages for the specific regulator configuration needed.

Selection Notes

Select this component when precise regulation of multiple low-voltage planes is required from a single controller unit. The device is suitable for designs utilizing external N-channel MOSFETs for high-current delivery. Consider the integrated sense feature for maintaining accuracy over long trace lengths and the availability of bypass modes for specific system initialization sequences.

Part Context

This part belongs to the MC33567 family of dual linear FET controllers manufactured by onsemi. The series includes variants with different fixed output voltages tailored for specific computer bus standards. The MC33567D-1R2 specifically addresses the power requirements for AGP and GTL+ technologies commonly found in legacy computing architectures.

Replacement Considerations

MC33567D-1G

FAQ

How does the device handle short circuit conditions?

The controller enters a protected Hiccup Mode when a short circuit or undervoltage condition is detected. In this mode, the output turns on briefly and then remains off for a longer duration until the fault is removed.

What is the purpose of the Bypass Function?

The Bypass Function allows Regulator 2 of the MC33567-1 variant to fully enhance the external MOSFET, connecting the output directly to the input voltage minus the MOSFET drop. This is primarily used for AGP card detection.