SFFSAB7 April 2025 TPS62A02-Q1 , TPS62A02A-Q1

4 Pin Failure Mode Analysis (Pin FMA)

This section provides a Failure Mode Analysis (FMA) for the pins of the TPS62A02-Q1 and TPS62A02A-Q1. The failure modes covered in this document include the typical pin-by-pin failure scenarios:

Pin short-circuited to Ground (see Table 4-2)
Pin open-circuited (see Table 4-3)
Pin short-circuited to an adjacent pin (see Table 4-4)
Pin short-circuited to VIN (see Table 4-5)

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

Class	Failure Effects
A	Potential device damage that affects functionality
B	No device damage, but loss of functionality
C	No device damage, but performance degradation
D	No device damage, no impact to functionality or performance

Figure 4-1 shows the TPS62A02-Q1 and TPS62A02A-Q1 pin diagram. For a detailed description of the device pins, please refer to the 'Pin Configuration and Functions' section in the TPS62A02-Q1 and TPS62A02A-Q1 data sheet.

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 TPS62A02-Q1 and TPS62A02A-Q1 data sheet.

Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground

Pin Name	Pin 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	B
PG	6	Loss of pin functionality; device keeps functioning	C

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	Loss of pin functionality; device keeps functioning.	C

Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin

Pin Name	Pin No.	Shorted to	Description 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	4	FB	Potential device damage	A
FB	5	PG	Potential device damage	A

Table 4-5 Pin FMA for Device Pins Short-Circuited to VIN

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
GND	1	Device not functional	B
SW	2	Potential device damage; Incorrect output voltage	A
VIN	3	Intended functionality	D
EN	4	Intended functionality; Device permanently enable	D
FB	5	Potential device damage	A
PG	6	Loss of pin functionality; VIN shorted to GND with a low resistance path during start-up; Potential device damage	A