SLVA745A December 2015 – April 2025 TPS7B4253-Q1
4.2 PWP 20-pin HTSSOP (with exposed thermal pad) Package
Figure 4-2 shows the TPS7B4253-Q1 pin diagram for the PWP 20-pin HTSSOP (with exposed thermal pad) package. For a detailed description of the device pins, see the Pin Configuration and Functions section in the TPS7B4253-Q1 data sheet.
Figure 4-2 Pin Diagram (PWP 20-pin HTSSOP (with exposed thermal
pad) Package)Table 4-6 Pin FMA for Device Pins
Short-Circuited to Ground
| 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 |
| NC | 3 | No effect. Normal operation. | D |
| NC | 4 | No effect. Normal operation. | D |
| NC | 5 | No effect. Normal operation. | D |
| GND | 6 | No effect. Normal operation. | D |
| NC | 7 | No effect. Normal operation. | D |
| NC | 8 | No effect. Normal operation. | D |
| NC | 9 | No effect. Normal operation. | D |
| FB | 10 | 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 | 11 | Device is disabled, resulting in no output voltage. | B |
| NC | 12 | No effect. Normal operation. | D |
| NC | 13 | No effect. Normal operation. | D |
| NC | 14 | No effect. Normal operation. | D |
| GND | 15 | No effect. Normal operation. | D |
| NC | 16 | No effect. Normal operation. | D |
| NC | 17 | No effect. Normal operation. | D |
| NC | 18 | No effect. Normal operation. | D |
| EN | 19 | Device is disabled, resulting in no output voltage. | B |
| IN | 20 | Power is not supplied to the device. System performance depends on upstream current limiting. | B |
Table 4-7 Pin FMA for Device Pins
Open-Circuited
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| OUT | 1 | The device output is disconnected from the load. | B |
| NC | 2 | No effect. Normal operation. | D |
| NC | 3 | No effect. Normal operation. | D |
| NC | 4 | No effect. Normal operation. | D |
| NC | 5 | No effect. Normal operation. | D |
| GND | 6 | Ground loop parasitics are increased and transient performance can be degraded. | C |
| NC | 7 | No effect. Normal operation. | D |
| NC | 8 | No effect. Normal operation. | D |
| NC | 9 | No effect. Normal operation. | D |
| FB | 10 | The error amplifier input is not connected. Output voltage is indeterminate. | B |
| ADJ | 11 | The device state is unknown. If the device is on, the output voltage is indeterminate. | B |
| NC | 12 | No effect. Normal operation. | D |
| NC | 13 | No effect. Normal operation. | D |
| NC | 14 | No effect. Normal operation. | D |
| GND | 15 | Ground loop parasitics are increased and transient performance can be degraded. | C |
| NC | 16 | No effect. Normal operation. | D |
| NC | 17 | No effect. Normal operation. | D |
| NC | 18 | No effect. Normal operation. | D |
| EN | 19 | The enable circuit is in an unknown state. The device can be enabled or disabled. | B |
| IN | 20 | Power is not supplied to the device. | B |
Table 4-8 Pin FMA for Device Pins
Short-Circuited to Adjacent Pin
| Pin Name | Pin No. | Shorted to | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|---|
| OUT | 1 | NC | No effect. Normal operation. | D |
| NC | 2 | NC | No effect. Normal operation. | D |
| NC | 3 | NC | No effect. Normal operation. | D |
| NC | 4 | NC | No effect. Normal operation. | D |
| NC | 5 | GND | No effect. Normal operation. | D |
| GND | 6 | NC | No effect. Normal operation. | D |
| NC | 7 | NC | No effect. Normal operation. | D |
| NC | 8 | NC | No effect. Normal operation. | D |
| NC | 9 | FB | No effect. Normal operation. | D |
| ADJ | 11 | NC | No effect. Normal operation. | D |
| NC | 12 | NC | No effect. Normal operation. | D |
| NC | 13 | NC | No effect. Normal operation. | D |
| NC | 14 | GND | No effect. Normal operation. | D |
| GND | 15 | NC | No effect. Normal operation. | D |
| NC | 16 | NC | No effect. Normal operation. | D |
| NC | 17 | NC | No effect. Normal operation. | D |
| NC | 18 | EN | No effect. Normal operation. | D |
| EN | 19 | IN | Device is always enabled. | B |
Table 4-9 Pin FMA for Device Pins
Short-Circuited to
Supply
| 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 |
| NC | 3 | No effect. Normal operation. | D |
| NC | 4 | No effect. Normal operation. | D |
| NC | 5 | No effect. Normal operation. | D |
| GND | 6 | Power is not supplied to the device. System performance depends on upstream current limiting. | B |
| NC | 7 | No effect. Normal operation. | D |
| NC | 8 | No effect. Normal operation. | D |
| NC | 9 | No effect. Normal operation. | D |
| FB | 10 | 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 | 11 | VOUT tracks VIN minus the dropout voltage. | B |
| NC | 12 | No effect. Normal operation. | D |
| NC | 13 | No effect. Normal operation. | D |
| NC | 14 | No effect. Normal operation. | D |
| GND | 15 | Power is not supplied to the device. System performance depends on upstream current limiting. | B |
| NC | 16 | No effect. Normal operation. | D |
| NC | 17 | No effect. Normal operation. | D |
| NC | 18 | No effect. Normal operation. | D |
| EN | 19 | Device is always enabled. | B |
| IN | 20 | No effect. Normal operation. | D |