SBVA065A December 2019 – December 2022 TPS7A53-Q1
Figure 4-1 shows the TPS7A53-Q1 pin diagram for the VQFN package. For a detailed description of the device pins, see the Pin Configuration and Functions section in the TPS7A53-Q1 data sheet.
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| OUT | 1 | Regulation is not possible, the device operates at current limit. The device can cycle in and out of thermal shutdown. | B |
| NC | 2 | No effect. Normal operation. | D |
| FB | 3 | Output voltage is the input voltage minus the dropout voltage because the error amplifier drives the pass transistor gate to the rail. | B |
| PG | 4 | PG always indicates that the output is not at the target level. | B |
| DNC | 5 | No effect. Normal operation. | D |
| NC | 6 | No effect. Normal operation. | D |
| NC | 7 | No effect. Normal operation. | D |
| GND | 8 | No effect. Normal operation. | D |
| NC | 9 | No effect. Normal operation. | D |
| NC | 10 | No effect. Normal operation. | D |
| NC | 11 | No effect. Normal operation. | D |
| BIAS | 12 | VBIAS does not provide biasing, any benefits associated with using a separate VBIAS are no longer present. | C |
| NR/SS | 13 | The internal reference cannot start. The device cannot turn on. | B |
| EN | 14 | The device is disabled, resulting in no output voltage. | B |
| IN | 15 | There is no power to the device, resulting in no output voltage. | B |
| IN | 16 | There is no power to the device, resulting in no output voltage. | B |
| IN | 17 | There is no power to the device, resulting in no output voltage. | B |
| GND | 18 | No effect. Normal operation. | D |
| OUT | 19 | Regulation is not possible, the device operates at current limit. The device can cycle in and out of thermal shutdown. | B |
| OUT | 20 | Regulation is not possible, the device operates at current limit. The device can cycle in and out of thermal shutdown. | B |
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| OUT | 1 | Device parasitics are increased and transient performance is degraded. | C |
| NC | 2 | No effect. Normal operation. | D |
| FB | 3 | The error amplifier input is not connected. Output voltage is indeterminate. | B |
| PG | 4 | PG functionality is lost. | B |
| DNC | 5 | No effect. Normal operation. | D |
| NC | 6 | No effect. Normal operation. | D |
| NC | 7 | No effect. Normal operation. | D |
| GND | 8 | Device biasing has no current path. The device is not operational and does not regulate. | B |
| NC | 9 | No effect. Normal operation. | D |
| NC | 10 | No effect. Normal operation. | D |
| NC | 11 | No effect. Normal operation. | D |
| BIAS | 12 | VBIAS does not provide biasing, any benefits associated with using a separate VBIAS are no longer present. | C |
| NR/SS | 13 | The device starts up with default timing. Any noise-reduction benefits are lost. | C |
| EN | 14 | The enable circuit is in an unknown state. The device can be enabled or disabled. | B |
| IN | 15 | Device parasitics are increased and transient performance is degraded. | C |
| IN | 16 | Device parasitics are increased and transient performance is degraded. | C |
| IN | 17 | Device parasitics are increased and transient performance is degraded. | C |
| GND | 18 | The charge pump has no current path. The device regulates but performance is degraded. | C |
| OUT | 19 | Device parasitics are increased and transient performance is degraded. | C |
| OUT | 20 | Device parasitics are increased and transient performance is degraded. | C |
| Pin Name | Pin No. | Shorted to | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|---|
| OUT | 1 | NC (pin 2) | No effect. Normal operation. | D |
| NC | 2 | FB (pin 3) | No effect. Normal operation. | D |
| FB | 3 | PG (pin 4) | PG functionality is lost. The output voltage set by the feedback resistors is incorrect. | B |
| PG | 4 | DNC (pin 5) | The low-dropout regulator (LDO) can possibly not work properly because the PG signal can create errors during LDO start-up. | B |
| DNC | 5 | NC (pin 6) | No effect. Normal operation. | D |
| NC | 6 | NC (pin 7) | No effect. Normal operation. | D |
| NC | 7 | GND (pin 8) | No effect. Normal operation. | D |
| GND | 8 | NC (pin 9) | No effect. Normal operation. | D |
| NC | 9 | NC (pin 10) | No effect. Normal operation. | D |
| NC | 10 | NC (pin 11) | No effect. Normal operation. | D |
| NC | 11 | BIAS (pin 12) | No effect. Normal operation. | D |
| BIAS | 12 | NR/SS (pin 13) | VBIAS can potentially violate the absolute maximum rating on the NR/SS pin and cause damage. If this condition is not met, the internal reference cannot get to the target voltage and the output voltage is incorrect. | A |
| NR/SS | 13 | EN (pin 14) | The output voltage is incorrect. | B |
| EN | 14 | IN (pin 15) | The device is always enabled when the input is powered. | B |
| IN | 15 | IN (pin 16) | No effect. Normal operation. | D |
| IN | 16 | IN (pin 17) | No effect. Normal operation. | D |
| IN | 17 | GND (pin 18) | No power to the device, resulting in no output voltage. | B |
| GND | 18 | OUT (pin 19) | Regulation is not possible, the device operates at current limit. The device can cycle in and out of thermal shutdown. | B |
| OUT | 19 | OUT (pin 20) | No effect. Normal operation. | D |
| OUT | 20 | OUT (pin 1) | No effect. Normal operation. | D |
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| OUT | 1 | Regulation is not possible. | B |
| NC | 2 | No effect. Normal operation. | D |
| FB | 3 | The FB absolute maximum rating (3.6 V max) can be violated, damaging the device. If VIN < 3.6 V and if there is any loading on the device, the output is approximately 0 V. If there is no load on the device, the output is equal to VIN. | A |
| PG | 4 | PG functionality is lost. | B |
| DNC | 5 | The LDO can possibly not work properly because the input signal can create errors during LDO start-up. | B |
| NC | 6 | No effect. Normal operation. | D |
| NC | 7 | No effect. Normal operation. | D |
| GND | 8 | No output voltage. System performance depends on the upstream current limiting. | B |
| NC | 9 | No effect. Normal operation. | D |
| NC | 10 | No effect. Normal operation. | D |
| NC | 11 | No effect. Normal operation. | D |
| BIAS | 12 | Any benefits of using a separate supply for VBIAS are lost. If VIN is shorted to VBIAS, the supplies can destroy each other. | C |
| NR/SS | 13 | The absolute maximum rating for the NR/SS pin can be violated, damaging the pin. If the absolute maximum rating is not violated, the output voltage is equal to the input voltage minus the dropout voltage. | A |
| EN | 14 | The device is always enabled when the input is powered. | B |
| IN | 15 | No effect. Normal operation. | D |
| IN | 16 | No effect. Normal operation. | D |
| IN | 17 | No effect. Normal operation. | D |
| GND | 18 | No output voltage. System performance depends on the upstream current limiting. | B |
| OUT | 19 | Regulation is not possible. | B |
| OUT | 20 | Regulation is not possible. | B |