SFFSAA8 July 2025 TPS7B4256-Q1
Figure 4-1 shows the TPS7B4256-Q1 pin diagram for the D package. For a detailed description of the device pins, see the Pin Configuration and Functions section in the TPS7B4256-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 |
| GND | 2 | No effect. Normal operation. | D |
| GND | 3 | No effect. Normal operation. | D |
| FB | 4 | If FB is directly connected to OUT, regulation is not possible, the device operates at current limit. The device can cycle in and out of thermal shutdown. If FB is connected by a resistor divider, VOUT tracks VIN minus the dropout voltage. | B |
| ADJ/EN | 5 | The device is disabled, resulting in no output voltage. | B |
| GND | 6 | No effect. Normal operation. | D |
| GND | 7 | No effect. Normal operation. | D |
| IN | 8 | Power is not supplied to the device. System performance depends on upstream current limiting. | B |
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| OUT | 1 | The device output is disconnected from the load. | B |
| GND | 2 | No effect. Normal operation. | D |
| GND | 3 | No effect. Normal operation. | D |
| FB | 4 | The error amplifier input is not connected. Output voltage is indeterminate. | B |
| ADJ/EN | 5 | The device state is unknown. If the device is on, the output voltage is indeterminate. | B |
| GND | 6 | Ground loop parasitics are increased and transient performance can be degraded. | C |
| GND | 7 | No effect. Normal operation. | D |
| IN | 8 | Power is not supplied to the device. | B |
| Pin Name | Pin No. | Shorted to | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|---|
| OUT | 1 | GND | Regulation is not possible, the device operates at current limit. The device can cycle in and out of thermal shutdown. | B |
| GND | 2 | GND | No effect. Normal operation. | D |
| GND | 3 | FB | If FB is directly connected to OUT, regulation is not possible, the device operates at current limit. The device can cycle in and out of thermal shutdown. If FB is connected by a resistor divider, VOUT tracks VIN minus the dropout voltage. | B |
| ADJ/EN | 5 | GND | The device is disabled, resulting in no output voltage. | B |
| GND | 6 | GND | No effect. Normal operation. | D |
| GND | 7 | IN | Power is not supplied to the device. System performance depends on upstream current limiting. | B |
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| OUT | 1 | Regulation is not possible. VOUT = VIN. | B |
| NC | 2 | No effect. Normal operation. | D |
| GND | 3 | Power is not supplied to the device. System performance depends on upstream current limiting. | B |
| FB | 4 | Device channel is closed. If FB is tied to OUT, then VOUT = VIN. If FB is connected with a resistor divider, VOUT equals VIN if there is no loading on the device. If the loading on the device exceeds the leakage through the top feedback resistor, VOUT is pulled to 0V. | B |
| ADJ/EN | 5 | VOUT tracks VIN minus the dropout voltage. | B |
| GND | 6 | Power is not supplied to the device. System performance depends on upstream current limiting. | B |
| NC | 7 | No effect. Normal operation. | D |
| IN | 8 | No effect. Normal operation. | D |