SNVA961A May 2020 – November 2024 LM26420-Q1
4.2 WQFN-16 Package
Figure 4-2 shows the LM26420-Q1 pin diagram for the WQFN-16 package. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the LM26420-Q1 data sheet.
Figure 4-2 Pin Diagram (WQFN-16 Package)Table 4-6 Pin FMA for Device Pins Short-Circuited to Ground
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| VIND1 | 1 | Device does not power up. | B |
| VIND1 | 2 | Device does not power up. | B |
| SW1 | 3 | Potential device damage. | A |
| PGND1 | 4 | No effect. | D |
| FB1 | 5 | Output voltage regulated to VIN (100% mode). | B |
| PG1 | 6 | Intended functionality if PG1 is not used. | D |
| PG2 | 7 | Intended functionality if PG2 is not used. | D |
| FB2 | 8 | Output voltage regulated to VIN (100% mode). | B |
| PGND2 | 9 | No effect. | D |
| SW2 | 10 | Potential device damage. | A |
| VIND2 | 11 | Device does not power up. | B |
| VIND2 | 12 | Device does not power up. | B |
| EN2 | 13 | Intended functionality if converter 2 is shutdown. | D |
| AGND | 14 | No effect. | D |
| VINC | 15 | Device does not power up. | B |
| EN1 | 16 | Intended functionality if converter 1 is shutdown. | D |
| DAP | - | No effect. | D |
Table 4-7 Pin FMA for Device Pins Open-Circuited
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| VIND1 | 1 | Device does not power up. | B |
| VIND1 | 2 | Device does not power up. | B |
| SW1 | 3 | Converter 1 not functional, open loop operation. | B |
| PGND1 | 4 | Device is not functional. | B |
| FB1 | 5 | Undetermined converter 1 output voltage. | B |
| PG1 | 6 | Intended functionality if PG1 is not used. | D |
| PG2 | 7 | Intended functionality if PG2 is not used. | D |
| FB2 | 8 | Undetermined converter 2 output voltage. | B |
| PGND2 | 9 | Device is not functional. | B |
| SW2 | 10 | Converter 2 not functional, open loop operation. | B |
| VIND2 | 11 | Device does not power up. | B |
| VIND2 | 12 | Device does not power up. | B |
| EN2 | 13 | Undetermined device status, device potentially does not power up. | B |
| AGND | 14 | Device is not functional. | B |
| VINC | 15 | Device is not functional. | B |
| EN1 | 16 | Undetermined device status, device potentially does not power up. | B |
| DAP | - | Functional but impact on thermal behavior and reliability. | C |
Table 4-8 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
| Pin Name | Shorted to | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| VIND1 | VIND1 | Redundant pin. | D |
| VIND1 | SW1 | Potential device damage. | A |
| SW1 | PGND1 | Potential device damage. | A |
| FB1 | PG1 | Potential device damage. | A |
| PG1 | PG2 | PG output can be wrong. | C |
| PG2 | FB2 | Potential device damage. | A |
| PGND2 | SW2 | Potential device damage. | A |
| SW2 | VIND2 | Potential device damage. | A |
| VIND2 | VIND2 | Redundant pin. | D |
| EN2 | AGND | Intended functionality if converter 2 is shutdown. | D |
| AGND | VINC | Device does not power up. | B |
| VINC | EN1 | Intended functionality. | D |
Table 4-9 Pin FMA for Device Pins Short-Circuited to
Supply
| Pin Name | Pin No. | Description of Potential Failure Effects | Failure Effect Class |
|---|---|---|---|
| VIND1 | 1 | Intended functionality. | D |
| VIND1 | 2 | Intended functionality. | D |
| SW1 | 3 | Potential device damage. | A |
| PGND1 | 4 | Device does not power up. | B |
| FB1 | 5 | Potential device damage. | A |
| PG1 | 6 | PG does not indicate the status. | B |
| PG2 | 7 | PG does not indicate the status. | B |
| FB2 | 8 | Potential device damage. | A |
| PGND2 | 9 | Device does not power up. | B |
| SW2 | 10 | Potential device damage. | A |
| VIND2 | 11 | Intended functionality. | D |
| VIND2 | 12 | Intended functionality. | D |
| EN2 | 13 | Intended functionality. | D |
| AGND | 14 | Device does not power up. | B |
| VINC | 15 | Intended functionality. | D |
| EN1 | 16 | Intended functionality. | D |
| DAP | - | Device does not power up. | B |