SFFS456 December   2025 TPS785-Q1

 

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
    1. 2.1 VSON Package
    2. 2.2 TO-252 Package
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 VSON Package
    2. 4.2 VSON Package B Version
    3. 4.3 TO-252 Package
  7. 5Revision History

4.3 TO-252 Package

Figure 4-5 shows the TPS785-Q1 pin diagram for the TO-252 package. For a detailed description of the device pins, see the Pin Configuration and Functions section in the TPS785-Q1 datasheet.

TPS785-Q1 Pin Diagram (TO-252 Package) Figure 4-5 Pin Diagram (TO-252 Package)
Table 4-10 Pin FMA for Device Pins Short-Circuited to Ground
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
EN 1 The device remains in the disabled state, providing no output voltage. B
IN 2 There is no input to the LDO. The output voltage is not regulated. B
GND 3 There is no impact to the device. The device operates as normal. D
OUT 4 The device hits the current limit state. If power dissipation is significant, the device hits the thermal shutdown state. If the fault condition is not removed, the device continues to cycle in and out of thermal shutdown. Continuously running the device above the rated current degrades the reliability of the device. B
A
NC 5 NC Pin (Fixed Output): There is no impact to the device. The device operates as normal with improved thermal performance. D
FB FB Pin (Adjustable Output): The output voltage is not regulated. The device operates as a switch and VOUT tracks VIN. B
Table 4-11 Pin FMA for Device Pins Open-Circuited
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
EN 1 The output voltage remains in an indeterminate state. VOUT is likely pulled to GND. B
IN 2 There is no input to the LDO. The output voltage is not regulated. B
GND 3 With the reference pin floating, the voltages at the remaining pins are floating as well and the device is not functional. There is a risk of violating the absolute maximum ratings. B
A
OUT 4 The downstream devices do not receive power. B
NC 5 NC Pin (Fixed Output): There is no impact to the device. The device operates as normal. D
FB FB Pin (Adjustable Output): The feedback loop is open, as a result, the output voltage is not regulated and remains in an indeterminate state. B
Table 4-12 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin Name Pin No. Shorted to Description of Potential Failure Effects Failure Effect Class
EN 1 IN The device remains ON regardless of the enable signal value. B
IN 2 GND There is no input to the LDO. The output voltage is not regulated. B
GND 3 OUT The device hits current limit state. If power dissipation is significant, the device hits thermal shutdown state. If the fault condition is not removed, the device continues to cycle in and out of thermal shutdown. Continuously running the device above the rated current degrades the reliability of the device. B
A
OUT 4 NC NC Pin (Fixed Output): There is no impact to the device. The device operates as normal. D
FB FB Pin (Adjustable Output): The output voltage is held at 1.2V and does not regulate at target value. B
NC 5 EN NC Pin (Fixed Output): There is no impact to the device. The device operates as normal. D/B/A
FB FB Pin (Adjustable Output): The output voltage is not regulated at target value and for VEN > 2V, this is an absolute maximum rating violation.
Table 4-13 Pin FMA for Device Pins Short-Circuited to Supply (VIN)
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
EN 1 The device remains ON regardless of the enable signal value. B
IN 2 There is no impact to the device. The device operates as normal. D
GND 3 The device does not turn ON. The output voltage stays low at 0V. B
OUT 4 The output voltage is not regulated and equals VIN. A violation of the absolute maximum ratings of the downstream device is possible. B
NC 5 NC Pin (Fixed Output): There is no impact to the device. The device operates as normal. D/B/A
FB FB Pin (Adjustable Output): The output voltage is not regulated at the target value, and for VIN > 2V, this is an absolute maximum rating violation.