Boards that don’t use descreet DC-DC converters seem to use Injoinic PMICs. A list of them can be seen here. Alas there are almost no datasheets for these things.
| # | name | # | name |
|---|---|---|---|
| 1 | vin | 17 | dc3fb |
| 2 | dc0fb | 18 | dc8vin |
| 3 | dc0vin | 19 | dc3lx |
| 4 | dc0lx | 20 | ldo2456vin |
| 5 | 21 | dc1lx | |
| 6 | dc2lx | 22 | dc1vin |
| 7 | dc2vin | 23 | dc1fb |
| 8 | dc2fb | 24 | vref |
| 9 | 25 | ldo2 | |
| 10 | ldo0vin | 26 | |
| 11 | 27 | ldo4 | |
| 12 | sck | 28 | ldo5 |
| 13 | sda | 29 | ldo6 |
| 14 | 30 | ||
| 15 | 31 | losci | |
| 16 | 32 | losco | |
| 33 | gnd |