SFFS607 april   2023 TPS3435 , TPS3435-Q1 , TPS3436-Q1 , TPS35 , TPS35-Q1 , TPS36-Q1

 

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)

3 Failure Mode Distribution (FMD)

The failure mode distribution estimation for TPS3435, TPS3436, TPS35, and TPS36 in Table 3-1 and Table 3-2 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 TPS35 and TPS36
Die Failure ModesFailure Mode Distribution (%)

False Assert on Reset or WDO

1%

RESET or WDO remain asserted

3%
Incorrect Timing Operation

(Early or late WDO faults, Reset/WDO de-assertion delays)

66%
Reset Trip outside of specification.

24%

Supply Current is out of spec

6%

Table 3-2 Die Failure Modes and Distribution TPS3435 and TPS3436
Die Failure ModesFailure Mode Distribution (%)

False Assert on Reset or WDO

1%

RESET or WDO remain asserted

4%
Incorrect Timing Operation

(Early or late WDO faults, Reset/WDO de-assertion delays)

87%

Supply Current is out of spec

8%