SBVA088 August 2022 TPS746-Q1
Figure 4-3 and Figure 4-4 show the TPS746-Q1 pin diagram (adjustable and fixed) for the DRB package. For a detailed description of the device pins, see the Pin Configuration and Functions section in the TPS746-Q1 data sheet.
| Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
|---|---|---|---|
| OUT | 1 | The output voltage is near or at ground. The device enters current limit. The device may cycle in and out of thermal shutdown depending on power dissipation. | B |
| NC | 2 | Improved thermal performance. | D |
| FB/NC | 3 | (Adjustable
output.) The device stops regulating. VOUT becomes equal
to VIN minus dropout because the pass transistor is
driven on as hard as possible. (Fixed output.) No effect. |
B, D |
| GND | 4 | — | D |
| EN | 5 | The device turns off. | B |
| PG | 6 | The PG function does not work. | D |
| NC | 7 | Improved thermal performance. | D |
| IN | 8 | No output voltage. | B |
| Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
|---|---|---|---|
| OUT | 1 | Output voltage is disconnected from the load. | B |
| NC | 2 | No effect. | D |
| FB/NC | 3 | (Adjustable output.) The error amplifier input is
left floating, the output voltage is not equal to set voltage. (Fixed output.) No effect. |
B, D |
| GND | 4 | The device may be disabled. | B |
| EN | 5 | The device may be disabled. | B |
| PG | 6 | The PG function does not work. | D |
| NC | 2 | No effect. | D |
| IN | 8 | No output voltage. | B |
| Pin Name | Pin No. | Short to | Description of Potential Failure Effect(s) | Failure Effect Class |
|---|---|---|---|---|
| OUT | 1 | NC (pin 2) | Reduced thermal performance. | D |
| NC | 2 | FB/NC (pin 3) | No effect. | D |
| FB/NC | 3 | GND (pin 4) | (Adjustable output.) The device stops regulating.
VOUT becomes equal to VIN minus dropout
because the pass transistor is always on. (Fixed output.) No effect. |
B/D |
| GND | 4 | EN (pin 5) | The output is forced off, VOUT is 0 V. | B |
| EN | 5 | PG (pin 6) | The device stays off. | B |
| PG | 6 | NC (pin 7) | No effect. | D |
| NC | 7 | IN (pin 8) | Reduced thermal performance. | D |
| Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
|---|---|---|---|
| OUT | 1 | The output is not regulated. VOUT = VIN. | B |
| NC | 2 | No effect. | D |
| FB/NC | 3 | (Adjustable output.) The FB pin is damaged if
VIN is higher than 2 V. (Fixed output.) No effect. |
A, D |
| GND | 4 | No output voltage. Either input supply is at 0 V, or input fuse is blown. | B |
| EN | 5 | The output is forced on regardless of enable signal. | B |
| PG | 6 | The PG function does not work. | D |
| NC | 7 | No effect. | D |
| IN | 8 | No effect. | D |