SFFS583 September 2023 TPS62A01-Q1 , TPS62A01A-Q1
This section provides a Failure Mode Analysis (FMA) for the pins of the TPS62A01-Q1 and TPS62A01A-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.
Class | Failure Effects |
---|---|
A | Potential device damage that affects functionality |
B | No device damage, but loss of functionality |
C | No device damage, but performance degradation |
D | No device damage, no impact to functionality or performance |
Figure 4-1 shows the TPS62A01-Q1 and TPS62A01A-Q1 pin diagram. For a detailed description of the device pins, please refer to the 'Pin Configuration and Functions' section in the TPS62A01-Q1 and TPS62A01A-Q1 data sheet.
Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:
Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|
GND | 1 | Intended functionality | D |
SW | 2 | Potential device damage; incorrect output voltage | A |
VIN | 3 | Device not functional; no power supply. | B |
EN | 4 | Device not functional; device cannot be enabled. | B |
FB | 5 | Incorrect output voltage; device performance degradation | C |
PG | 6 | Lost the pin functionality; device keeps functioning | D |
Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|
GND |
1 |
Missing ground reference; device not functional. |
B |
SW |
2 |
Open loop operation; device not functional. |
B |
VIN |
3 |
Device not functional; No power supply. |
B |
EN |
4 |
Unintended device functionality; undefined state of pin EN. |
B |
FB |
5 |
Undetermined output voltage behavior, open loop operation. |
B |
PG |
6 |
Lost the pin functionality; device keeps functioning. |
B |
Pin Name | Pin No. | Shorted to | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|---|
GND | 1 | SW | Potential device damage ; Incorrect output voltage | A |
SW | 2 | VIN | Potential device damage ; Incorrect output voltage | A |
VIN | 3 | EN | Intended Functionality | D |
EN | 5 | FB | Potential device damage | A |
FB | 6 | PG | Potential device damage | A |
Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|
GND | 1 | Device not functional; Open loop operation | B |
SW | 2 | Potential device damage; Incorrect output voltage | A |
VIN | 3 | Intended functionality | D |
EN | 4 | Intended functionality; Device permanently enabled | D |
FB | 5 | Potential device damage | A |
PG | 6 | Lost the pin functionality; VIN shorted to GND with a low resistance path during start-up; potential device damage | A |