Figure 4-1 shows the TPS7B4255-Q1 pin diagram for the DBV package. For a detailed description of
the device pins, see the Pin Configuration and Functions section in the TPS7B4255-Q1 data sheet.
Figure 4-1 Pin Diagram (DBV) Package
Table 4-2 Pin FMA for Device Pins
Short-Circuited to Ground
Pin Name
Pin No.
Description of Potential Failure Effects
Failure Effect Class
ADJ/EN
1
The device is disabled, resulting in no
output voltage.
B
GND
2
No effect. Normal operation.
D
IN
3
Power is not supplied to the device.
System performance depends on upstream current limiting.
B
OUT
4
Regulation is not possible, the device
operates at current limit. The device can cycle in and out of
thermal shutdown.
B
NC
5
No effect. Normal operation.
D
Table 4-3 Pin FMA for Device Pins
Open-Circuited
Pin Name
Pin No.
Description of Potential Failure Effects
Failure Effect Class
ADJ/EN
1
The device state is unknown. If the
device is on, the output voltage is indeterminate.
B
GND
2
There is no current loop for the supply
voltage. The device is not operational and does not
regulate.
B
IN
3
Power is not supplied to the device.
B
OUT
4
The device output is disconnected from
the load.
B
NC
5
No effect. Normal operation.
D
Table 4-4 Pin FMA for Device Pins
Short-Circuited to Adjacent Pin
Pin Name
Pin No.
Shorted to
Description of Potential Failure Effects
Failure Effect Class
ADJ/EN
1
GND
The device is disabled, resulting in no
output voltage.
B
GND
2
IN
Power is not supplied to the device.
System performance depends on upstream current limiting.
B
OUT
4
NC
No effect. Normal operation.
D
Table 4-5 Pin FMA for Device Pins
Short-Circuited to
Supply
Pin Name
Pin No.
Description of Potential Failure Effects
Failure Effect Class
ADJ/EN
1
The device operates as a switch in
dropout mode. The output tracks the input minus the dropout voltage.
B
GND
2
Power is not supplied to the device.
System performance depends on upstream current limiting.