Automotive Functional Safety and ISO 26262

by Timothy Hegarty, Texas Instruments, Power Systems Design, Jul 01 2025

Focus:
This article offers a brief introduction to functional safety requirements in automotive applications as required by ISO 26262. It identifies the risk classes – known as Automotive Safety Integrity Levels (ASILs) – and notes their applicability to automotive semiconductors, in particular, the power supplies for system-on-a-chip (SoC) and multicore processor loads. It then presents a series of designs built around TI regulators that enable functional safety compliance in off-battery buck, pre-regulator designs. The ICs highlighted here are the LM5137F-Q1 dual-channel buck controller; and the 65-V, 8-A LM68680-Q1 and 65-V, 4.5-A LM68645-Q1 buck converters. Their ASIL compliance levels are noted.

What you’ll learn:

• How to implement automotive functional safety compliant pre-regulator designs for SoCs and multicore processors

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