Power
UM2231
8/26
UM2231 Rev 6
Figure 4. Output supply filtering
1.5
Power supply design reference
During prototyping stage, for the first PCBs, it is recommended to plan to have some filtering
components on Teseo-LIV3 power supplies as shown In
Figure 5
.
Figure 5. Power supply filtering
Inductor size is 0401 (1.0×0.5mm) and capacitors are 0201 (0.6×0.3mm).
In case VCC_IO is separate from VCC, a serial 27nH inductor could also be planned for first
PCBs.
If all 3 pins have common supply, one single capacitor and one single inductor can be used.
If not it is recommended to duplicate the filtering.
1.6
Current consumption optimization
Use of an SMPS at 2.1 V to supply VCC is recommended to optimize current consumption.
Here is an application example with ST1S12GR with an efficiency around 85%.
