SFFS583 September   2023 TPS62A01-Q1 , TPS62A01A-Q1

 

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)

Pin Failure Mode Analysis (Pin FMA)

This section provides a Failure Mode Analysis (FMA) for the pins of the TPS62A01-Q1 and TPS62A01A-Q1. The failure modes covered in this document include the typical pin-by-pin failure scenarios:

Table 4-2 through Table 4-5 also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1.

Table 4-1 TI Classification of Failure Effects
ClassFailure Effects
APotential device damage that affects functionality
BNo device damage, but loss of functionality
CNo device damage, but performance degradation
DNo device damage, no impact to functionality or performance

Figure 4-1 shows the TPS62A01-Q1 and TPS62A01A-Q1 pin diagram. For a detailed description of the device pins, please refer to the 'Pin Configuration and Functions' section in the TPS62A01-Q1 and TPS62A01A-Q1 data sheet.

GUID-64976A8E-6474-4B2D-9FBD-64235B4A6F07-low.svg Figure 4-1 Pin Diagram

Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:

  • The device is operating in the typical application. Please refer to the 'Simplified Schematics' on the first page in the TPS62A01-Q1 and TPS62A01A-Q1 data sheet.

Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class

GND

1

Intended functionality

D

SW

2

Potential device damage; incorrect output voltage

A

VIN

3

Device not functional; no power supply.

B

EN

4

Device not functional; device cannot be enabled.

B

FB

5

Incorrect output voltage; device performance degradation

C

PG

6

Lost the pin functionality; device keeps functioning

D

Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin Name Pin No. Description of Potential Failure Effect(s) Failure Effect Class

GND

1

Missing ground reference; device not functional.

B

SW

2

Open loop operation; device not functional.

B

VIN

3

Device not functional; No power supply.

B

EN

4

Unintended device functionality; undefined state of pin EN.

B

FB

5

Undetermined output voltage behavior, open loop operation.

B

PG

6

Lost the pin functionality; device keeps functioning.

B

Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin NamePin No.Shorted toDescription of Potential Failure Effect(s)Failure Effect Class

GND

1

SW

Potential device damage ; Incorrect output voltage

A

SW

2

VIN

Potential device damage ; Incorrect output voltage

A

VIN

3

EN

Intended Functionality

D

EN

5

FB

Potential device damage

A

FB

6

PG

Potential device damage

A

Table 4-5 Pin FMA for Device Pins Short-Circuited to VIN
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class

GND

1

Device not functional; Open loop operation

B

SW

2

Potential device damage; Incorrect output voltage

A

VIN

3

Intended functionality

D

EN

4

Intended functionality; Device

permanently enabled

D

FB

5

Potential device damage

A

PG

6

Lost the pin functionality; VIN shorted to GND with a low resistance path during start-up; potential device damage

A