SFFS315 September   2022 TPS7B86-Q1

 

  1.   Trademarks
  2. 1Overview
  3. 2Functional Safety Failure In Time (FIT) Rates
    1. 2.1 TO-252 Package
    2. 2.2 HSOIC Package
  4. 3Failure Mode Distribution (FMD)
  5. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 TO-252 Package
    2. 4.2 HSOIC Package
    3. 4.3 HSOIC Package B Version
    4. 4.4 HSOIC Package D Version

4.2 HSOIC Package

Figure 4-2 shows the TPS7B86-Q1 pin diagram for the HSOIC package without PG. For a detailed description of the device pins, see the Pin Configuration and Functions section in the TPS7B86-Q1 data sheet.

GUID-5AD62F38-DD1F-4719-AC44-4C83D9086332-low.gif Figure 4-2 Pin Diagram
(HSOIC Package Without PG)
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
FB/NC 2

(Fixed output.) No effect. Normal operation.

(Adjustable output.) Output voltage is input voltage minus dropout voltage because the error amplifier drives the pass transistor gate to the rail.

 B/D
NC 3 No effect. Normal operation. D
NC 4 No effect. Normal operation. D
GND 5 No effect. Normal operation. D
NC 6 No effect. Normal operation. D
EN 7 The device is disabled, resulting in no output voltage. 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 The device output is disconnected from the load. B
FB/NC 2

(Fixed output.) No effect. Normal operation.

(Adjustable output.) The error amplifier input is not connected. The output voltage is indeterminate.

 B/D
NC 3 No effect. Normal operation. D
NC 4 No effect. Normal operation. D
GND 5 There is no current loop for the supply voltage. The device is not operational and does not regulate. B
NC 6 No effect. Normal operation. D
EN 7 The enable circuit is in an unknown state. The device can be enabled or disabled. B
IN 8 Power is not supplied to the device, resulting in no output voltage. 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 FB/NC (pin 2)

(Fixed output.) No effect. Normal operation.

(Adjustable output.) Output voltage is equal to internal reference voltage.

 B/D
FB/NC 2 NC (pin 3) No effect. Normal operation. D
NC 3 NC (pin 4) No effect. Normal operation. D
GND 5 NC (pin 6) No effect. Normal operation. D
NC 6 EN (pin 7) No effect. Normal operation. D
EN 7 IN (pin 8) The device is always enabled when the input is powered. 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 Damage is possible if the absolute maximum rating is exceeded (20 V max). Reverse current can destroy the device. A
FB/NC 2

(Fixed output.) No effect. Normal operation.

(Adjustable output.) The error amplifier input can be damaged. The output is not at the target voltage.

 A/D
NC 3 No effect. Normal operation. D
NC 4 No effect. Normal operation. D
GND 5 Power is not supplied to the device. System performance depends on upstream current limiting. B
NC 6 No effect. Normal operation. D
EN 7 The device is always enabled when the input is powered. B
IN 8 No effect. Normal operation. D