MC33908LAER2

Overview

The MC33908LAER2 is a System Basis Chip (SBC) from NXP Semiconductors designed for automotive applications. It provides power to Microcontroller Units (MCUs) and optimizes energy consumption through DC/DC switching regulators, linear regulators, and ultra-low-power saving modes. The device features an advanced functional safety block associated with fail-safe outputs, designed for ASIL D applications. It includes a serial peripheral interface (SPI) for control and diagnostics with the MCU. The chip integrates CAN and LIN physical interfaces compliant with ISO 11898-2, -5, LIN 2.2, 2.1/J2602-2 standards, along with the latest automotive OEM standards for EMC and ESD.

Feature Summary

• Advanced functional safety measures including monitoring of critical analog parameters, a failsafe state machine, and an advanced watchdog to reduce software complexity with dual-core lock-step MCUs.
• Integration of CAN and LIN physical interfaces compliant with ISO 11898-2, -5, LIN 2.2, 2.1/J2602-2 standards along with the latest automotive OEM standards for EMC and ESD.
• Flexible DC/DC pre-regulator allowing Buck or Buck-Boost topologies, with optional Boost to improve system availability at cranking.

Applications

• Electrical power steering
• Automotive engine management systems
• General purpose automotive microcontroller power supply

Procurement Notes

Verify the specific suffix 'L' in the part number MC33908LAER2 against the official datasheet to confirm temperature grade or package variations. Check the lifecycle status as some sources indicate end-of-life or obsolescence warnings. Ensure compatibility with the target MCU's SPI interface and voltage requirements before procurement.

Selection Notes

Select this component when ASIL D functional safety compliance is required for the power management unit. It is suitable for applications needing integrated CAN/LIN transceivers and flexible DC/DC regulation for MCU core and I/O supplies. Consider the LQFP48EP package constraints and thermal performance for high-temperature automotive environments.

Part Context

The MC33908 belongs to NXP's System Basis Chip family, which combines power management and communication interfaces into a single solution. This integration reduces board space and simplifies design by providing dedicated regulators for MCU cores, I/Os, and auxiliary loads alongside robust physical layer interfaces.

Replacement Considerations

Check for direct substitutes within the MC33907/8 series or newer generations like the FS4500 if available. Verify pin-to-pin compatibility and feature parity, especially regarding functional safety levels and regulator currents, before replacing.