SLVAEU4A June 2020 – November 2025 TPS61175-Q1
4 Pin Failure Mode Analysis (Pin FMA)
This section provides a failure mode analysis (FMA) for the pins of the TPS61175-Q1. The failure modes covered in this document include the typical pin-by-pin failure scenarios:
- Pin short-circuited to ground (see Table 4-2)
- Pin open-circuited (see Table 4-3)
- Pin short-circuited to an adjacent pin (see Table 4-4)
- Pin short-circuited to supply (see Table 4-5)
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
| 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 TPS61175-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the TPS61175-Q1 datasheet.
Figure 4-1 Pin DiagramFollowing are the assumptions of use and the device configuration assumed for the pin FMA in this section:
- The device is used within the Recommended Operating Conditions and the Absolute Maximum Ratings sections found in the TPS61175-Q1 datasheet.
- The configuration is as shown in the Application and Implementation section found in the TPS61175-Q1 datasheet.
Table 4-2 Pin FMA for Device Pins
Short-Circuited to Ground
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| SW | 1 | The power supply is short. There is potential damage to the inductor and pin. | A |
| 2 | The power supply is short. There is potential damage to the inductor and pin. | A | |
| VIN | 3 | The power supply is short. The device does not operate. | B |
| EN | 4 | There is a loss of the ENABLE function. The device remains in shut-down mode. | B |
| SS | 5 | The device does not operate. | B |
| SYNC | 6 | The output voltage is correct. There is a loss of the SYNC function. | C |
| AGND | 7 | There is no effect on the device. | D |
| COMP | 8 | The device does not operate. | B |
| FB | 9 | The output voltage is extremely high. The device is potentially damaged. | A |
| FREQ | 10 | The switching frequency is extremely high. The device is potentially damaged. | A |
| NC | 11 | There is no effect on the device. | D |
| PGND | 12 | There is no effect on the device. | D |
| 13 | There is no effect on the device. | D | |
| 14 | There is no effect on the device. | D |
Table 4-3 Pin FMA for Device Pins
Open-Circuited
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| SW | 1 | The device is potentially damaged. | A |
| 2 | The device is potentially damaged. | A | |
| VIN | 3 | There is a loss of power supply. The device does not operate. | B |
| EN | 4 | There is a loss of the ENABLE function. The device remains in shut-down mode. | B |
| SS | 5 | There is a loss of the soft start function. | C |
| SYNC | 6 | The device is easily coupled by noise. | B |
| AGND | 7 | The internal signals have no reference ground. The device is potentially damaged. | A |
| COMP | 8 | The output voltage cannot regulate. The device is potentially damaged. | A |
| FB | 9 | The output voltage cannot regulate. The device is potentially damaged. | A |
| FREQ | 10 | The device does not operate. | B |
| NC | 11 | The device is potentially damaged. | A |
| PGND | 12 | When one of the repetitive pins is left open, there is no effect to the function of the pin. | D |
| 13 | When one of the repetitive pins is left open, there is no effect to the function of the pin. | D | |
| 14 | When one of the repetitive pins is left open, there is no effect to the function of the pin. | D |
Table 4-4 Pin FMA for Device Pins
Short-Circuited to Adjacent Pin
| Pin Name | Pin No. | Shorted to | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|---|
| SW | 1 | SW | There is no effect on the device. | D |
| SW | 2 | VIN | The device is potentially damaged. | A |
| VIN | 3 | EN | The output voltage is correct. There is a loss of the ENABLE function. | C |
| EN | 4 | SS | The SS pin is damaged if the voltage of the EN pin is higher than 7V. | A |
| SS | 5 | SYNC | The device does not operate. | B |
| SYNC | 6 | AGND | The output voltage is correct. There is a loss of the SYNC function. | C |
| COMP | 8 | FB | The output voltage cannot regulate. The device is potentially damaged. | A |
| FB | 9 | FREQ | The output voltage cannot regulate. The device is potentially damaged. | A |
| FREQ | 10 | NC | The switching frequency is extremely high. The output voltage is incorrect. | B |
| NC | 11 | PGND | There is no effect on the device. | D |
| PGND | 12 | PGND | There is no effect on the device. | D |
| PGND | 13 | PGND | There is no effect on the device. | D |
Table 4-5 Pin FMA for Device Pins
Short-Circuited to Supply
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| SW | 1 | The device is potentially damaged. | A |
| 2 | The device is potentially damaged. | A | |
| VIN | 3 | There is no effect on the device. | D |
| EN | 4 | The output voltage is correct. There is a loss of the ENABLE function. | D |
| SS | 5 | The SS pin is damaged if the supply voltage is higher than 7V. | A |
| SYNC | 6 | The SYNC pin is damaged if the supply voltage is higher than 7V. | A |
| AGND | 7 | There is high current out of the power supply. The device does not operate. | B |
| COMP | 8 | The COMP pin is damaged if the supply voltage is higher than 3V. | A |
| FB | 9 | The FB pin is damaged if the supply voltage is higher than 3V. | A |
| FREQ | 10 | The FREQ pin is damaged if the supply voltage is higher than 3V. | A |
| NC | 11 | The device is potentially damaged. | A |
| PGND | 12 | There is high current out of the power supply. The device does not operate. | B |
| 13 | There is high current out of the power supply. The device does not operate. | B | |
| 14 | There is high current out of the power supply. The device does not operate. | B |