• Define intended application, safety goals, IC function, system boundary, operating conditions and external assumptions. 

• Identify relevant sector standards and separate component qualification from functional-safety evidence. 

• Develop or review failure-mode analysis, FMEDA and dependent/common-cause failure analysis as appropriate. 

• Convert safety-manual assumptions and diagnostic expectations into allocated, testable system requirements. 

• Plan silicon, board, ECU and system-level verification with fault injection and configuration traceability. 

• Maintain errata, part/stepping, software, calibration and change-control records throughout the product lifecycle. 

Application-specific challenges 

Unintended or simultaneous switching: Input, driver, isolation or supply fault causes an unintended gate state or cross-conduction. 

Protection response too slow or unavailable: Overcurrent/desaturation detection, blanking, fault latch or shutdown path does not react as required. 

Supply sequencing and undervoltage: Brownout, UVLO thresholds, reset timing or rail interaction creates invalid control outputs. 

Diagnostic coverage and fault reporting: Fault flags fail, are ambiguous, are not latched, or are not sampled by the host controller. 

Isolation and common-cause dependencies: Shared supplies, isolation barriers, reference domains or layout create coupled failures. 

Thermal and electrical stress: Short circuit, switching transients, overshoot, temperature or load variation exceeds assumptions. 

Host IC integration mismatch: MCU timing, reset behaviour, fault handling or configuration differs from the IC safety documentation. 

IC architecture and operating context 

Include gate-driver input logic, level shifting, gate outputs, desaturation/overcurrent protection where provided, Miller clamp, dead-time control, isolation, fault reporting, supply monitoring, PMIC rails, reset outputs, watchdog interfaces, sequencing, safety MCU connections, external current/voltage sensors, power switches, DC link and load. Define whether the IC is used in traction inverter, OBC, DC-DC, EPS, actuator, industrial drive or another application because the safety goals and fault reactions differ. 

The architecture review should distinguish the IC’s internal safety mechanisms from external measures and application-level reactions. Document dependencies on supply, clock, reset, external sensing, host software, PCB layout, test access and operating conditions. For each assumption, identify the owner and the evidence that demonstrates it is satisfied in the intended product. 

Applicable standards and boundaries 

• ISO 26262 series, including relevant hardware and semiconductor guidance. 

• ISO 26262-11: semiconductor application guidance; verify current edition. 

• AEC-Q100 may apply to IC qualification but does not establish functional-safety compliance. 

• IEC 61508 may be relevant to industrial applications outside the road-vehicle scope; select the governing sector standard. 

• ISO/SAE 21434 may apply to security-relevant configuration, diagnostics and update interfaces. 

• Relevant power-device, EMC, electrical safety and product-specific requirements depend on the end application. 

Applicability note: this is a preliminary screening list, not a declaration that every listed standard applies. Confirm current editions, amendments, product scope, target market and contractual requirements. ISO 26262 is specific to road vehicles; industrial, medical, railway and other applications may require different sector standards. AEC-Q100 qualification, where applicable, does not by itself establish functional-safety compliance. 

Functional-safety lifecycle 

1. Use-case and boundary definition: establish intended application, safety function, operating environment, interfaces and assumptions of use. 
2. Hazard and failure analysis: identify IC failure modes, system effects, dependent failures and relevant safety mechanisms. 
3. Safety requirements and allocation: specify detection, reaction, diagnostic interval, fault reporting and integration obligations. 
4. Architecture and implementation: define independence, partitioning, safe outputs, reset/power behaviour and configuration controls. 
5. Verification planning: define silicon, simulation, emulation, board, ECU and system-level evidence with test conditions and acceptance criteria. 
6. Integration validation: confirm safety-manual assumptions, host response and external protective measures in the target application. 
7. Lifecycle control: manage silicon revisions, errata, production test, changes, field feedback and ongoing validity of safety evidence. 

Hazards, failure scenarios and safety objectives 

The scenarios below are illustrative and are not a completed FMEDA, quantitative risk assessment or declaration of a safety integrity level. Failure rates, diagnostic coverage, hardware metrics and safety targets must be derived from the actual device data, fault model, intended application and governing standard. 

ID	Illustrative hazardous scenario	Potential consequence	Example engineering objective
H-01	Unintended power-stage switching	Unexpected torque, current, energy flow or actuator movement	Define safe gate state, interlocks and fault response for relevant supply/input faults.
H-02	Overcurrent fault not interrupted	Power device damage, thermal event or loss of control	Specify detection, shutdown timing and coordination with power-stage limits.
H-03	PMIC rail fault affects control logic	Reset, corrupted computation or invalid outputs	Define rail monitoring, sequencing, reset behaviour and fault indication.
H-04	Diagnostic flag missed or misleading	Host fails to react to a hazardous IC condition	Verify fault reporting, latching, latency, host polling/interrupt and recovery.
H-05	Isolation or shared-supply failure defeats protection	Multiple protective functions fail together	Analyse isolation, shared power/reference, physical layout and common-cause assumptions.

 

Safety requirements, architecture and implementation 

Specify valid input/output states across power-up/down, UVLO and reset, gate output behaviour, dead time and interlock assumptions, protection detection and response timing, fault latch/clear semantics, diagnostic pin electrical characteristics, PMIC rail tolerance and sequencing, watchdog/reset interactions, isolation assumptions, thermal operating envelope, host-controller reaction and configuration control. Tie numeric thresholds and response times to the device datasheet, safety manual, power-stage design and application risk analysis; do not treat a component datasheet alone as the complete safety argument. 

Maintain traceability from system safety goals and hazards to IC safety requirements, safety mechanisms, assumptions of use, external measures, verification results and integration evidence. Clearly identify what is demonstrated by the semiconductor supplier and what remains the integrator’s responsibility. 

Verification, validation and safety evidence 

Verify input combinations and power sequencing, UVLO/brownout, reset assertion/release, gate output under fault, short-circuit/overcurrent protection within approved test limits, fault reporting and latch/clear behaviour, isolation-related faults where testable, temperature and supply corners, EMC, load and switching transients, host-controller response and recovery. Use simulation, bench tests, hardware-in-the-loop and silicon fault injection as appropriate. High-energy tests require engineered fixtures, current/voltage limits and approved safety procedures. 

Typical evidence may include the safety plan, safety manual, FMEDA and failure-rate basis, dependent-failure analysis, requirements and traceability, fault-injection protocols/results, silicon revision and errata records, diagnostic coverage rationale, test-tool limitations, integration test results, anomalies and closure, and documented assumptions of use. The appropriate evidence package depends on the safety lifecycle and product role. 

Common pitfalls and recommended prevention 

Pitfall	Recommended prevention / detection
Assuming a protection feature guarantees safe shutdown	Verify detection latency, output state, fault latch, power availability and host reaction in the integrated design.
Ignoring power-up and power-down transitions	Test sequencing, brownout, partial rails, reset timing and gate outputs at all relevant transitions.
Testing fault pins without the receiving MCU	Verify the complete detection-to-reaction path, including sampling, interrupts, software and actuator response.
Using generic timing thresholds	Derive values from the selected IC, power device, application limits and applicable standard.
Missing shared-supply dependencies	Analyse whether PMIC or driver supply faults disable both control and protective functions.
Running high-energy tests without controlled limits	Use qualified fixtures, fault-energy containment, instrument calibration and documented test safety controls.

 

Relationship to adjacent disciplines 

Semiconductor FMEDA identifies IC failure modes; power electronics engineering determines switching and energy limits; ECU functional safety defines the host reaction; EMC engineering evaluates disturbances; thermal/reliability engineering supports operating limits; cybersecurity may protect programmable settings and diagnostics; system integration validates vehicle- or machine-level effects.

• ISO 26262 series and ISO 26262-11 — Road-vehicle functional safety and semiconductor guidance; verify current editions. 

• AEC-Q100 — IC qualification; verify applicable revision. 

• IEC 61508 — Functional safety of E/E/PE safety-related systems, where relevant outside road vehicles. 

• ISO/SAE 21434 — Road vehicles cybersecurity engineering, where in scope. 

Currency note — Draft prepared 29 October 2026. Verify current standard editions, amendments, applicability and target-market requirements before publication or project use. This article is engineering information, not a declaration of conformity, certification, or guarantee that a particular IC is suitable for a safety-related application.

• Confirm semiconductor and functional-safety technical reviewer approval. 

• Verify standards editions, product scope, clauses and target-market requirements. 

• Confirm all internal service links resolve and the keyword map avoids cannibalisation. 

• Prepare an original architecture visual with descriptive alt text. 

• Avoid unsupported ASIL, SIL, diagnostic-coverage or compliance claims. 

• Check title/H1 alignment, metadata, canonical URL, visible FAQs, references and proofreading. 

VerveTronics can assist with gate-driver/PMIC safety requirements, FMEDA and safety-manual reviews, diagnostic-path analysis, fault-injection planning and power-stage/ECU integration V&V. Scope should define the IC, switching device, application, energy levels, fault model and available safety documentation. 

Suggested CTA: Request a semiconductor functional-safety, FMEDA or integration-evidence review.

• Is a gate-driver fault output enough to claim diagnostic coverage? No. The complete detection and reaction chain must be considered, including fault-pin behaviour, host sampling, software reaction, timing and the final power-stage state. 
• Can the same PMIC safety analysis be used in every ECU? Not without checking rail architecture, loads, reset dependencies, external monitoring, safety goals and assumptions of use. 
• Does ISO 26262 apply to an industrial drive using the same IC? ISO 26262 is for road vehicles. Industrial applications may require IEC 61508 or another sector-specific framework, depending on the equipment and jurisdiction.