SFFSAD7 June 2025 TPS4HC120-Q1
PRODUCTION DATA
This section provides a failure mode analysis (FMA) for the pins of the TPS4HC120-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.
| 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 TPS4HC120-Q1 pin diagram. For a detailed description of the device pins, see the Pin Configuration and Functions section in the TPS4HC120-Q1 data sheet.
Following is the of use and the device configuration assumed for the pin FMA in this section:
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| NC | 1 | No effect. | D |
| EN1 | 2 | The corresponding channel shuts down. | B |
| EN2 | 3 | The corresponding channel shuts down. | B |
| EN3 | 4 | The corresponding channel shuts down. | B |
| EN4 | 5 | The corresponding channel shuts down. | B |
| SEL1 | 6 | The sense function is activated for only channel 1 or 3. | B |
| SEL0 | 7 | The sense function is activated for only channel 1 or 2. | B |
| DIAG_EN | 8 | The diagnostics are disabled. | B |
| FLT_ | 9 | The status reported is potentially erroneous. | B |
| LPM | 10 | The LPM status reported is potentially erroneous. | B |
| SNS | 11 | The sense current is not valid from the SNS pin. | B |
| ILIM | 12 | The device defaults to 2.25A current limit. | C |
| GND | 13 | The resistor or diode network is bypassed, if present. | B |
| NC | 14 | No effect. | D |
| VOUT4 | 15 | The current limit of the device engages. | B |
| VOUT4 | 16 | The current limit of the device engages. | B |
| VOUT3 | 17 | The current limit of the device engages. | B |
| VOUT3 | 18 | The current limit of the device engages. | B |
| NC | 19 | No effect. | D |
| VBB | 20 | The device has no input supply, and therefore, does not function. | B |
| VBB | 21 | The device has no input supply, and therefore, does not function. | B |
| VBB | 22 | The device has no input supply, and therefore, does not function. | B |
| VBB | 23 | The device has no input supply, and therefore, does not function. | B |
| NC | 24 | No effect. | D |
| VOUT2 | 25 | The current limit of the device engages. | B |
| VOUT2 | 26 | The current limit of the device engages. | B |
| VOUT1 | 27 | The current limit of the device engages. | B |
| VOUT1 | 28 | The current limit of the device engages. | B |
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| NC | 1 | No effect. | D |
| EN1 | 2 | Channel 1 shuts down, EN is pulled down internally. | B |
| EN2 | 3 | Channel 2 shuts down, EN is pulled down internally. | B |
| EN3 | 4 | Channel 3 shuts down, EN is pulled down internally. | B |
| EN4 | 5 | Channel 4 shuts down, EN is pulled down internally. | B |
| SEL1 | 6 | Internally pulled down. The sense function is activated for only channel 1 or 3 | B |
| SEL0 | 7 | Internally pulled down. The sense function is activated for only channel 1 or 2. | B |
| DIAG_EN | 8 | Internally pulled down. The diagnostics are disabled. | B |
| FLT_ | 9 | The fault signal is not reported. | B |
| LPM | 10 | The LPM signal is not reported. | B |
| SNS | 11 | The correct sense current cannot be read. | B |
| ILIM | 12 | The device defaults to 5A current limit. | C |
| GND | 13 | Loss of ground detection engages and the device shuts off. | B |
| NC | 14 | No effect. | D |
| VOUT4 | 15 | No effect. If configured, open-load detection triggers. | B |
| VOUT4 | 16 | No effect. If configured, open-load detection triggers. | B |
| VOUT3 | 17 | No effect. If configured, open-load detection triggers. | B |
| VOUT3 | 18 | No effect. If configured, open-load detection triggers. | B |
| NC | 19 | No effect. | D |
| VBB | 20 | The device has no input supply, and therefore, does not function. | B |
| VBB | 21 | The device has no input supply, and therefore, does not function. | B |
| VBB | 22 | The device has no input supply, and therefore, does not function. | B |
| VBB | 23 | The device has no input supply, and therefore, does not function. | B |
| NC | 24 | No effect. | D |
| VOUT2 | 25 | No effect. If configured, open-load detection triggers. | B |
| VOUT2 | 26 | No effect. If configured, open-load detection triggers. | B |
| VOUT1 | 27 | No effect. If configured, open-load detection triggers. | B |
| VOUT1 | 28 | No effect. If configured, open-load detection triggers. | B |
| Pin Name | Pin No. | Shorted to Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|---|
| NC | 1 | 2 | No effect. | D |
| EN1 | 2 | 3 | The EN1 signal affects the EN2 signal, and the EN2 signal affects the EN1 signal. | B |
| EN2 | 3 | 4 | The EN2 signal affects the EN3 signal, and the EN3 signal affects the EN2 signal. | B |
| EN3 | 4 | 5 | The EN3 signal affects the EN4 signal, and the EN4 signal affects the EN3 signal. | B |
| EN4 | 5 | 6 | The EN4 signal affects the SEL1 signal, and the SEL1 signal affects the EN4 signal. | B |
| SEL1 | 6 | 7 | The SEL1 signal affects the SEL0 signal, and the SEL0 signal affects the SEL1 signal. | B |
| SEL0 | 7 | 8 | The SEL0 signal affects the DIAG_EN signal, and the DIAG_EN signal affects the SEL0 signal. | B |
| DIAG_EN | 8 | 9 | Fault reporting is erroneous, diagnostics are enabled if the FLT_ pin is high. | B |
| FLT_ | 9 | 10 | The reports of Fault and LPM are potentially erroneous. | B |
| LPM | 10 | 11 | The reports of current sensing and LPM are potentially erroneous. | B |
| SNS | 11 | 12 | The outputs of current limit and current sensing are incorrect. | B |
| ILIM | 12 | 13 | The device defaults to 2.25A current limit. | B |
| GND | 13 | 14 | No effect. | D |
| VOUT4 | 15 | 16 | No effect. | D |
| VOUT4 | 16 | 17 | There is a potential loss of load control on channels 3 and 4. | B |
| VOUT3 | 17 | 18 | No effect. | D |
| VOUT3 | 18 | 19 | No effect. | D |
| NC | 19 | 20 | No effect. | D |
| VBB | 20 | 21 | No effect. | D |
| VBB | 21 | 22 | No effect. | D |
| VBB | 22 | 23 | No effect. | D |
| VBB | 23 | 24 | No effect. | D |
| NC | 24 | 25 | No effect. | D |
| VOUT2 | 25 | 26 | No effect. | D |
| VOUT2 | 26 | 27 | There is a potential loss of load control on channels 1 and 2. | B |
| VOUT1 | 27 | 28 | No effect. | D |
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| NC | 1 | No effect. | D |
| EN1 | 2 | There is a violation of the absolute maximum rating of the pin. A breakdown of the ESD cell is possible. | A |
| EN2 | 3 | There is a violation of the absolute maximum rating of the pin. A breakdown of the ESD cell is possible. | A |
| EN3 | 4 | There is a violation of the absolute maximum rating of the pin. A breakdown of the ESD cell is possible. | A |
| EN4 | 5 | There is a violation of the absolute maximum rating of the pin. A breakdown of the ESD cell is possible. | A |
| SEL1 | 6 | There is a violation of the absolute maximum rating of the pin. A breakdown of the ESD cell is possible. | A |
| SEL0 | 7 | There is a violation of the absolute maximum rating of the pin. A breakdown of the ESD cell is possible. | A |
| DIAG_EN | 8 | There is a violation of the absolute maximum rating of the pin. A breakdown of the ESD cell is possible. | A |
| FLT_ | 9 | There is a violation of the absolute maximum rating of the pin. A breakdown of the ESD cell is possible. | A |
| LPM | 10 | There is a violation of the absolute maximum rating of the pin. A breakdown of the ESD cell is possible. | A |
| SNS | 11 | There is a violation of the absolute maximum rating of the pin. A breakdown of the ESD cell is possible. | A |
| ILIM | 12 | There is a violation of the absolute maximum rating of the pin. A breakdown of the ESD cell is possible. | A |
| GND | 13 | The supply power is bypassed and the device does not turn on. | B |
| NC | 14 | No effect. | D |
| VOUT4 | 15 | The output is pulled to supply; a short-to-battery triggers, if configured. | D |
| VOUT4 | 16 | The output is pulled to supply; a short-to-battery triggers, if configured. | B |
| VOUT3 | 17 | The output is pulled to supply; a short-to-battery triggers, if configured. | B |
| VOUT3 | 18 | The output is pulled to supply; a short-to-battery triggers, if configured. | B |
| NC | 19 | No effect. | D |
| VBB | 20 | Intended operation. | D |
| VBB | 21 | Intended operation. | D |
| VBB | 22 | Intended operation. | D |
| VBB | 23 | Intended operation. | D |
| NC | 24 | No effect. | D |
| VOUT2 | 25 | The output is pulled to supply; a short-to-battery triggers, if configured. | B |
| VOUT2 | 26 | The output is pulled to supply; a short-to-battery triggers, if configured. | B |
| VOUT1 | 27 | The output is pulled to supply; a short-to-battery triggers, if configured. | B |
| VOUT1 | 28 | The output is pulled to supply; a short-to-battery triggers, if configured. | B |