SNVAA08 October   2020 REF4132 , REF4132-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)

Pin Failure Mode Analysis (Pin FMA)

This section provides a Failure Mode Analysis (FMA) for the pins of the REF4132-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 REF4132-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the REF4132-Q1 data sheet.

GUID-41F34F19-81F4-4279-9C12-F35035B29D28-low.gif Figure 4-1 DBV Package5-Pin SOT-23Top View

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

  • Unless otherwise specified, the voltage applied to the VIN pin is within the REF4132-Q1 Recommended Operating Range.
  • Device functionality indicates that the REF4132-Q1 output voltage is regulated
  • Layout used for this analysis is given by Figure 4-2
GUID-D7786284-9C60-4955-820E-AA4A1B8BA6B8-low.gif Figure 4-2 Layout Example
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
N/C1Could affect functionality of device. Pin is not internally connected to GND.B
GND2No Effect.D
EN3Disables device, no output voltage, high leakage.B
VIN 4 No output voltage, high leakage. B
VREF 5 No output voltage. B
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
N/C1No Effect.D
GND2No output voltage.B
EN3Disables device, no output voltage.B
VIN 4 Output is not regulated. B
VREF 5 Output is not regulated. B
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
N/C1GNDCould affect functionality. Pin not internally connected to GND.B
GND2ENDisables device, no output voltage, high leakage.B
EN3VINNo Effect.D
VIN 4 VREF Output is not regulated, high leakage. B
VREF 5 N/C Could affect functionality. Pin not internally connected to GND. B
Table 4-5 Pin FMA for Device Pins Short-Circuited to VIN
Pin Name Pin No. Description of Potential Failure Effect(s) Failure Effect Class
N/C 1 Could affect functionality of device. Pin is not internally connected to GND. B
GND 2 No output voltage, high leakage. B
EN 3 No Effect. D
VIN 4 No Effect. D
VREF 5 Output is not regulated, high leakage. B