MC33567D-1G

Overview

The MC33567D-1G is a dual linear power supply controller designed for motherboard applications requiring high-current voltage regulation. It interfaces with two external N-channel MOSFETs to regulate two independent supply planes. The device provides drive, sense, and control signals. Regulator 1 outputs 1.818 V for I/O planes and memory termination, while Regulator 2 outputs 1.515 V for GTL and AGP planes. It features undervoltage short circuit detection and supply undervoltage detection.

Feature Summary

• Provides independent regulation for two distinct supply planes using external N-channel MOSFETs.
• Incorporates undervoltage short circuit protection that activates hiccup mode upon fault detection.
• Includes a bypass function on Regulator 2 for 3.3 V AGP card detection.
• Features remote sensing capability to compensate for load voltage drops.

Applications

• Motherboard power management
• Dual power supply systems
• AGP plane regulation
• GTL+ bus voltage regulation

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the G-suffix indicates a lead-free package finish. Check current availability status as inventory levels fluctuate. Ensure the specific suffix matches the required output voltage configuration for the target application design.

Selection Notes

Select this controller when precise regulation of multiple low-voltage planes is required on a single board. It is suitable for designs utilizing external N-channel MOSFETs for high-current delivery. Consider the fixed output voltages of 1.818 V and 1.515 V. Evaluate system stability requirements regarding external capacitor ESR and driver gain bandwidth.

Part Context

This component belongs to the MC33567 family of dual linear FET controllers. Variants include the MC33567D-2G providing dual 2.525 V supplies and the MC33567D-3G offering 2.3 V and 1.2 V outputs. All variants share the same SO-8 package and core control architecture but differ in internal reference voltage settings.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate other members of the MC33567 family if different voltage outputs are acceptable, such as the MC33567D-2G or MC33567D-3G.

FAQ

How does the device handle short circuit conditions?

The MC33567D-1G enters a hiccup mode when a short circuit or undervoltage condition is detected. In this mode, the drive output turns on for approximately 1 ms and off for 40 ms until the fault is removed.

What is the purpose of the Bypass Function?

The bypass function is available only on Regulator 2 of the MC33567-1 variant. It fully enhances the external MOSFET when the SHDN pin voltage exceeds 4.1 V, allowing the output to track the input voltage minus the MOSFET drop.