onsemi MC33567D-002

Overview

MC33567D-002 from ON Semiconductor is a dual linear power supply controller designed for motherboard voltage regulation, driving two external N-channel MOSFETs to regulate independent supply planes. It delivers 1.818 V for I/O and memory termination and 1.515 V for GTL+/AGP planes, with undervoltage short-circuit protection, TTL-compatible shutdown inputs, and sense-line feedback for load-point regulation in high-current applications.

For engineers reviewing the MC33567D-002 datasheet, pinout, applications, or equivalent options, key selection criteria include dual-output voltage accuracy (±2.5% regulation), hiccup-mode fault response (0.97 ms on-time / 47.7 ms off-time), SO-8 package compatibility, and support for AGP card detection via VIN bypass mode on regulator 2.

Technical Context

The MC33567D-002 implements two independent linear regulator control loops, each with dedicated SENSE input, DRV output, and SHDN enable logic. Its internal architecture includes startup/undervoltage shutdown circuitry (UVLO threshold 8.5 V ±0.5 V), gate drive outputs capable of 10.5 V swing and 20 mA peak source/sink current, and hiccup-mode protection triggered at 75% VOUT under short-circuit conditions.

Each regulator operates autonomously: regulator 1 fixes at 1.818 V, regulator 2 at 1.515 V (MC33567−1 variant), with SHDN pins internally pulled up to 3.3 V and threshold hysteresis of 130 mV. The device requires external N-channel MOSFETs (e.g., MTD3055VL) and 100 µF output capacitance with ≤30 mΩ ESR for stable operation across 0–80°C ambient.

Key Specifications

Pinout & Package

MC33567D-002 uses an SO-8 (Case 751-07, D Suffix) surface-mount package measuring 4.9 mm × 3.9 mm × 1.5 mm, with standard 1.27 mm lead pitch and Pb-free option available (G-suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual linear controller applications.

Compared with MC33567D-1, the MC33567D-002 offers identical regulation performance but may differ in packaging format; versus ISL6522CRZ, it provides deterministic dual-fixed outputs and hardware-based AGP detection - critical for legacy motherboard designs where software-configurable VRMs are unsupported.

Availability

MC33567D-002 is available at Aetrix Electronics and suitable for desktop motherboard power management, AGP graphics card detection, and memory termination supply applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for MC33567D-002 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

ON Semiconductor (now onsemi) is a global semiconductor manufacturer specializing in power management, analog, and sensor solutions for automotive, industrial, and computing markets.

The MC33567 series belongs to ON Semiconductor's legacy power management IC portfolio, engineered specifically for high-current linear regulation in PC motherboard applications requiring dual-rail precision, fault resilience, and AGP interoperability.

FAQ

What output voltages does the MC33567D-002 provide?

The MC33567D-002 provides fixed output voltages of 1.818 V on regulator 1 (for I/O and memory termination) and 1.515 V on regulator 2 (for GTL+ and AGP planes), as defined in the MC33567−1 variant specification. These values are trimmed at production and maintain ±2.5% regulation across 5 mA to 1.3 A load current and 0–80°C ambient temperature. The MC33567D-002 does not support adjustable outputs without external resistor networks.

Does the MC33567D-002 support AGP card detection?

Yes, the MC33567D-002 supports AGP card detection via regulator 2's VIN bypass mode. When SHDN2 voltage exceeds 4.1 V, regulator 2 disables its control loop and fully enhances the external N-MOSFET, passing through the 3.3 V AGP slot voltage minus VDS(on). This feature is exclusive to the MC33567−1 variant and is confirmed in the datasheet's Figure 3 and Table 1 logic table for MC33567D-002.

What is the purpose of the SENSE pins on the MC33567D-002?

The SENSE1 and SENSE2 pins on the MC33567D-002 enable remote load-point voltage sensing to compensate for IR drop across PCB traces. They connect directly to the load side of the external MOSFETs and feed back to the error amplifiers. If left unconnected, the MC33567D-002 enters hiccup mode - confirming that sense-line feedback is mandatory for normal operation and tight regulation (±2.5%) at the actual load.

What protection features does the MC33567D-002 include?

The MC33567D-002 integrates undervoltage lockout (UVLO) triggering at 8.5 V (±0.5 V), short-circuit/undervoltage detection at 75% of nominal VOUT, and automatic hiccup-mode response (0.97 ms ON / 47.7 ms OFF). It also provides thermal protection via junction temperature limits (−5°C to 125°C) and ESD robustness (2000 V HBM). These protections activate independently per regulator and require no external components.

Can the MC33567D-002 drive high-side N-channel MOSFETs?

Yes, the MC33567D-002 is explicitly designed to drive external high-side N-channel MOSFETs using its DRV1 and DRV2 outputs, which deliver up to 10.5 V gate drive voltage and 20 mA peak source/sink current. The datasheet confirms characterization with MTD3055VL N-channel devices and specifies RDS(on) calculation guidance for proper FET selection. Bootstrap or charge-pump circuitry is not required due to integrated gate drive capability.