SBVA070A December   2019  – March 2021 TPS3702-Q1

 

  1.   Trademarks
  2. 1Overview
  3. 2Functional Safety Failure In Time (FIT) Rates
  4. 3Failure Mode Distribution (FMD)
  5. 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 TPS3702-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 TPS3702-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the TPS3702-Q1 data sheet.

GUID-53ED5223-038D-4BAE-B1C8-229E155A69A6-low.gif Figure 4-1 DDC PackageSOT-6Top View

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

  • Unless otherwise specified, it is assumed that the voltages applied to all the pins are within the Recommended Operating Range specified in the TPS3702-Q1 data sheet.
  • Note that the SET and the SENSE pin have lower maximum operating range than VDD and UV/OV.
  • For shorts to VDD, this document assumes the SET and SENSE pin maximum is not exceeded.
  • Refer to Typical Application Circuit diagram in the datasheet for test layout.
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
UV1No damage to device, undervoltage output pin nonfunctional, increase in system current.B
GND2No effect.D
SENSE3No damage to device, Undervoltage output always active, Overvoltage output always inactive.B
OV 4 No damage to device, Overvoltage output pin nonfunctional, increase in system current. B
VDD 5 No damage to device, but device is unpowered. Device is nonfunctional. B
SET 6 No damage to device, wide thresholds selected. B
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin Name Pin No. Description of Potential Failure Effect(s) Failure Effect Class
UV 1 No damage to device, undervoltage output pin nonfunctional. B
GND 2 No damage to device, but device is unpowered. Device is nonfunctional. B
SENSE 3 No damage to device. Due to internal resistor ladder for setting trip points open SENSE pin behaves as though GND potential - Undervoltage output always active, Overvoltage output always inactive. B
OV 4 No damage to device, overvoltage output pin nonfunctional. B
VDD 5 No damage to device, but device is unpowered. Device is nonfunctional. B
SET 6 No damage to device. Due to internal pull up on SET pin it behaves as if connected to VDD - narrow thresholds selected. 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
UV1GNDNo damage to device, undervoltage output pin nonfunctional, increase in system current.B
GND2SENSENo damage to device, Undervoltage output always active, Overvoltage output always inactive.B
SENSE3SETSince SET VIH = 750mV and all SENSE thresholds >1V, SENSE = SET means always narrow threshold tolerances selected.B
OV 4 UV No damage to device, but device is nonfunctional with both outputs tied together, can’t distinguish OV from UV. B
VDD 5 OV No damage to device, overvoltage output pin nonfunctional. B
SET 6 VDD No damage to device, narrow thresholds selected. B
Table 4-5 Pin FMA for Device Pins Short-Circuited to VDD
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
UV1No damage to device, undervoltage output pin nonfunctional.B
GND2No damage to device, but device is unpowered. Device is nonfunctional.B
SENSE3No damage to device, Undervoltage output always inactive, Overvoltage output always active.B
OV 4 No damage to device, overvoltage output pin nonfunctional. B
VDD 5 No effect. D
SET 6 No damage to device, narrow thresholds selected. B