SFFS272 September 2022 TPS7B81-Q1
Figure 4-1 shows the TPS7B81-Q1 pin diagram for the HVSSOP package. For a detailed description of the device pins, see the Pin Configuration and Functions section in the TPS7B81-Q1 data sheet.
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| IN | 1 | Power is not supplied to the device, resulting in no output voltage. | B |
| EN | 2 | The device is stuck in shutdown mode, resulting in no output voltage. | B |
| NC | 3 | No effect. Normal operation. | D |
| GND | 4 | No effect. Normal operation. | D |
| GND | 5 | No effect. Normal operation. | D |
| GND | 6 | No effect. Normal operation. | D |
| NC | 7 | No effect. Normal operation. | D |
| VOUT | 8 | The device is not operational when the output is pulled to GND. Current limit is triggered, and the device can repeatedly enter and exit thermal shutdown depending on power dissipation. | B |
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| IN | 1 | Power is not supplied to the device, resulting in no output voltage. | B |
| EN | 2 | The device flips between shutdown mode and normal mode because of the noise on the EN voltage. This condition can result in no output voltage. | B |
| NC | 3 | No effect. Normal operation. | D |
| GND | 4 | A floating GND pin can result in incorrect voltage regulation or no output voltage. | B |
| GND | 5 | A floating GND pin can result in incorrect voltage regulation or no output voltage. | B |
| GND | 6 | A floating GND pin can result in incorrect voltage regulation or no output voltage. | B |
| NC | 7 | No effect. Normal operation. | D |
| VOUT | 8 | The output is disconnected from the load. | B |
| Pin Name | Pin No. | Shorted to | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|---|
| IN | 1 | EN (pin 2) | EN is pulled to the IN supply. Shutdown mode is not possible. The device is powered on as long as the input supply is present. | D |
| EN | 2 | NC (pin 3) | No effect. Normal operation. | D |
| NC | 3 | GND (pin 4) | No effect. Normal operation. | D |
| GND | 5 | GND (pin 6) | No effect. Normal operation. | D |
| GND | 6 | NC (pin 7) | No effect. Normal operation. | D |
| NC | 7 | VOUT (pin 8) | No effect. Normal operation. | D |
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| IN | 1 | No effect. Normal operation. | D |
| EN | 2 | EN is pulled to VBAT. Shutdown mode is not possible. The device is powered on as long as VBAT is present. | C |
| NC | 3 | No effect. Normal operation. | D |
| GND | 4 | VBAT can discharge if other GND connections on the device are still tied to GND. If all pins are floated to VBAT, this condition can result in VOUT detecting the VBAT voltage. | B |
| GND | 5 | VBAT can discharge if other GND connections on the device are still tied to GND. If all pins are floated to VBAT, this condition can result in VOUT detecting the VBAT voltage. | B |
| GND | 6 | VBAT can discharge if other GND connections on device are still tied to GND. If all pins are floated to VBAT, this condition can result in VOUT detecting the VBAT voltage. | B |
| NC | 7 | No effect. Normal operation. | D |
| VOUT | 8 | The VOUT pin can be damaged and the load being powered by the TPS7B81-Q1 instead uses the VBAT voltage. | A |