SFFS115 March   2021 DRV8889-Q1

 

  1.   Trademarks
  2. 1Overview
  3. 2Functional Safety Failure In Time (FIT) Rates
  4. 3Failure Mode Distribution (FMD)
  5. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 HTSSOP Package
    2. 4.2 QFN Package

3 Failure Mode Distribution (FMD)

The failure mode distribution estimation for DRV8889-Q1 and DRV8889A-Q1 in Table 3-1 comes from the combination of common failure modes listed in standards such as IEC 61508 and ISO 26262, the ratio of sub-circuit function size and complexity and from best engineering judgment.

The failure modes listed in this section reflect random failure events and do not include failures due to misuse or overstress.

Table 3-1 Die Failure Modes and Distribution
Die Failure ModesFailure Mode Distribution (%)

xOUTx is stuck LOW when commanded OFF

8%

xOUTx is stuck OFF when commanded LOW

12%

xOUTx ON resistance too high when commanded LOW

8%

Low side slew rate too fast or too slow

3%

xOUTx is stuck HIGH when commanded OFF

9%

xOUTx is stuck OFF when commanded HIGH

13%

xOUTx ON resistance too high when commanded HIGH

9%

High side slew rate too fast or too slow

3%

Dead time is too short

4%

Incorrect communication or fault indication

14%

Current regulation incorrect

17%