SFFS626 February   2024 TPS1HTC30-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)

Pin Failure Mode Analysis (Pin FMA)

This section provides a Failure Mode Analysis (FMA) for the pins of the TPS1HTC30-Q1. The failure modes covered in this document include the typical pin-by-pin failure scenarios:

Table 4-2 through Table 4-5 also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1.

Table 4-1 TI Classification of Failure Effects
ClassFailure Effects
APotential device damage that affects functionality
BNo device damage, but loss of functionality
CNo device damage, but performance degradation
DNo device damage, no impact to functionality or performance

Figure 4-1 shows the TPS1HTC30-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the TPS1HTC30-Q1 data sheet.

GUID-20220721-SS0I-H2DC-MZXL-0X4JZP0NP0X5-low.svg Figure 4-1 Pin Diagram

Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:

  • Follows data sheet recommendation for operating conditions, external components selection, and PCB layout
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
GND1Resistor, diode network is bypassed if presentB
EN2Shutdown of corresponding channelB
DIAG_EN3Diagnostics are disabledB
FAULT4Status being reported can be erroneousB
LATCH5Device defaults to auto-retry mode when encountering thermal faultB
SNS6Sense current not valid from SNS pinB
ILIM7Device defaults to internal open current limitC
NC11No effectD
VOUT8,9,10Current limit of device engagesB
VS12,13,14Device has no input supply and therefore does not functionB
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
GND1Loss of ground detection engages and device shuts offB
EN2Corresponding channel is shutdown and EN is pulled down internallyB
DIAG_EN3Internally pulled down. Diagnostics are disabled.B
FAULT4Fault signal not reportedB
LATCH13Internally pulled down. Device defaults to auto-retry mode when encountering thermal faultB
SNS10Version B only. Correct sense current cannot be read.B
ILIM11Device defaults to internal current limitC
NC11No effectD
VOUT8,9,10No effect. If configured, open load detection triggersB
VS12,13,14Device has no input supply and therefore does not functionB
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin NamePin No.Shorted toDescription of Potential Failure Effect(s)Failure Effect Class
GND1ENChannel is disabledB
EN2DIAG_ENEN signal affects DIAG_EN signal and vice versaB
DIAG_EN3FAULTFault reporting is erroneous. Diagnostics are enabled if FAULT is pulled high.B
FAULT4LATCHFault reporting is erroneous. Device is in auto-retry mode if FAULT is pulled high.B
LATCH5SNSCurrent sensing output is erroneous. Device is in auto-retry or latched off depending on the output of the SNS pin.B
SNS6ILIMCurrent limit and current sensing output is incorrectB
VOUT10NCNo effectD
NC11VSNo effectD
Table 4-5 Pin FMA for Device Pins Short-Circuited to supply (VS)
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
GND1Supply power is bypassed and device does not turn onB
EN2Potential violation of absolute maximum rating of pin and possible breakdown of ESD cellA
DIAG_EN3Potential violation of absolute maximum rating of pin and possible breakdown of ESD cellA
FAULT4Version B only. Potential violation of absolute maximum rating of pin and possible breakdown of ESD cell.A
LATCH5Potential violation of absolute maximum rating of pin and possible breakdown of ESD cellA
SNS6Version B only. Potential violation of absolute maximum rating of pin and possible breakdown of ESD cellA
ILIM7Potential violation of absolute maximum rating of pin and possible breakdown of ESD cellA
NC11No effectD
VOUT8,9,10Output is pulled to supply voltage. Short-to-battery detection is triggered if configured.B