SFFSA27 May   2025 TPS7A21-Q1

 

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
    1. 2.1 VSON Package
    2. 2.2 WSON (DSG0008B) Package
    3. 2.3 WSON (DSG0008A) Package
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 VSON Package
    2. 4.2 WSON (DSG0008B) Package
    3. 4.3 WSON (DSG0008A) Package
  7. 5Revision History

4.2 WSON (DSG0008B) Package

Figure 4-2 shows the TPS7A21-Q1 pin diagram for the WSON (DSG0008B) package. For a detailed description of the device pins, see the Pin Configuration and Functions section in the TPS7A21-Q1 data sheet.

Figure 4-2 Pin Diagram (WSON (DSG0008B) Package)
Table 4-6 Pin FMA for Device Pins Short-Circuited to Ground
Pin NamePin No.Description of Potential Failure EffectsFailure Effect Class
OUT 1 Current limit is triggered, and the device can repeatedly enter and exit thermal shutdown depending on power dissipation. B
OUT 2 Current limit is triggered, and the device can repeatedly enter and exit thermal shutdown depending on power dissipation. B
NC 3 No effect. Normal operation. D
GND 4 No effect. Normal operation. D
EN 5 The device is disabled, resulting in no output voltage. B
NC 6 No effect. Normal operation. D
IN 7 Power is not supplied to the device. System performance depends on upstream current limiting. B
IN 8 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 Device parasitics are increased and transient performance is degraded. C
OUT 2 Device parasitics are increased and transient performance is degraded. C
NC 3 No effect. Normal operation. D
GND 4 Device biasing has no current path. The device is not operational and does not regulate. B
EN 5 The smart enable feature keeps the output turned off. B
NC 6 No effect. Normal operation. D
IN 7 Device parasitics are increased and transient performance is degraded. C
IN 8 Device parasitics are increased and transient performance is degraded. C
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 2 - OUT No effect. Normal operation. D
OUT 2 3 - NC No effect. Normal operation. D
NC 3 4 - GND No effect. Normal operation. D
EN 5 6 - NC No effect. Normal operation. D
NC 6 7 - IN No effect. Normal operation. D
IN 7 8 - IN No effect. Normal operation. D
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. B
OUT 2 Regulation is not possible. B
NC 3 No effect. Normal operation. D
GND 4 No output voltage. System performance depends on the upstream current limiting. B
EN 5 Device is always enabled. B
NC 6 No effect. Normal operation. D
IN 7 No effect. Normal operation. D
IN 8 No effect. Normal operation. D