SBVA086A June   2020  – November 2024 TPS7B84-Q1

 

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
    1. 2.1 VSON Package
    2. 2.2 SOT223 Package
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 VSON Package
    2. 4.2 SOT223 Package
  7. 5Revision History

4.1 VSON Package

Figure 4-1 shows the TPS7B84-Q1 pin diagram for the VSON package. For a detailed description of the device pins refer to the Pin Configuration and Functions section in the TPS7B84-Q1 data sheet.

TPS7B84-Q1 Pin Diagram (VSON Package) Figure 4-1 Pin Diagram (VSON 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
OUT 1 Regulation is not possible, the device operates at current limit. The device can cycle in and out of thermal shutdown. B
NC, FB 2 (Fixed) No effect. Normal operation. D
(Adjustable) The device operates as a switch in dropout mode. The output tracks VIN - VDO. B
NC 3, 4, 6 No effect. Normal operation. D
GND 5 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. B
Table 4-3 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, FB 2 (Fixed) No effect. Normal operation. D
(Adjustable) The device state is unknown. If the device is on, the output voltage is indeterminate. B
NC 3, 4, 6 No effect. Normal operation. D
GND 5 There is no current loop for the supply voltage. The device does not regulate and is at risk of exceeding absolute maximum conditions. A
EN 7 Device not turning on is possible. B
IN 8 Power is not supplied to the device. B
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin Name Pin No. Shorted to (1) Description of Potential Failure Effects Failure Effect Class
OUT 1 NC, FB (Fixed) No effect. Normal operation. D
(Adjustable) Normal operation if using the device in unity gain. D
(Adjustable) If not using the device in unity gain, connecting OUT to FB results in a low output voltage. B
NC, FB 2 NC No effect. Normal operation. D
NC 3 NC No effect. Normal operation. D
GND 5 NC No effect. Normal operation D
NC 6 EN No effect. Normal operation. D
EN 7 IN The device remains on. Regulation is possible. C
(1) In the event of a 10kΩ short between adjacent pins, there is no change in the potential failure effect or class.
Table 4-5 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. If VIN exceeds 20V, damage is possible. A
NC, FB 2 (Fixed) No effect. Normal operation. D
(Adjustable) The device having no output voltage is possible. B
NC 3, 4, 6 No effect. Normal operation. D
GND 5 Power is not supplied to the device. B
EN 7 The device remains on. Regulation is possible. C
IN 8 No effect. Normal operation. D