MC33908LAE

Overview

The NXP MC33908LAE is a System Basis Chip (SBC) designed for automotive applications, integrating power management and communication interfaces. It features a flexible DC/DC pre-regulator supporting Buck or Buck-Boost topologies to optimize energy consumption. The device includes a high-speed CAN physical interface compliant with ISO 11898-2 and -5 standards, alongside a LIN interface. It provides multiple output power supplies, including a DC/DC voltage regulator delivering up to 1.5 A for the MCU core and linear regulators for I/Os and auxiliary loads. Advanced functional safety measures support ASIL D applications.

Feature Summary

• Integrates a flexible SMPS pre-regulator allowing non-inverting buck-boost or standard buck topologies for efficient power conversion.
• Includes an enhanced high-speed CAN interface fulfilling ISO11898-2 and -5 standards with local and bus failure diagnostics.
• Provides multiple wake-up sources in low-power modes, such as CAN, LIN, and I/O transitions, combined with ultra-low-power saving modes.
• Features advanced functional safety measures designed for ASIL D applications, including secured SPI and configurable safety I/Os.

Applications

• Automotive engine control units
• Body control modules
• Safety-oriented system partitions requiring high integrity levels

Procurement Notes

Verify the specific suffix 'LAE' against official NXP documentation to confirm package type and temperature grade. Ensure compatibility with the target MCU's SPI requirements and voltage levels. Confirm that the Buck-Boost capability aligns with the system's input voltage range during cranking conditions. Check for any regional compliance certifications required for the final assembly.

Selection Notes

Select this component when a single-chip solution is needed for both power distribution and CAN/LIN communication in automotive ECUs. It is suitable for designs requiring high efficiency across wide input voltage ranges and robust functional safety features. Consider the integrated SMARTMOS technology for load protection and the need for reduced software complexity due to built-in safety mechanisms.

Part Context

The MC33908 belongs to the MC33907/8 family of System Basis Chips from NXP (formerly Freescale). These devices are multi-output power supply ICs dedicated to the automotive market, combining switching and linear regulators with communication transceivers. They utilize SMARTMOS technology for robust load handling and feature enhanced safety blocks for fail-safe operations.

Replacement Considerations

Check for direct pin-to-pin compatible alternatives within the MC33907/8 family or newer generations like the FS4500 if higher temperature ratings or additional features are required. Verify that any substitute maintains the same ASIL D qualification status and interface compatibility.