Other Parts Discussed in Thread: CC1350, TPS63030
Hello,
I have a wireless sensor network based on cc1350 (subGHz). The system is build using the cc1350 launchpads equipped with a shield that does the power supply. The energy for the system comes from a standard li-poly battery and it is regulated to 3.3v by a tps63031 buck-boost regulator. The board is then powered through the expansion headers of the launchpads.
I had several issues in making the network to work and today finally I found the source of the problems which is the noise produced by the tps63030 when put in power save mode. In fact by disabling the tps63031 power save mode the nodes works perfectly, the same if the node is powered with other non-noisy regulator.
Of course disabling the PS is just a workaround, not the solution (the tps have about 2mA of idle current in this condition), so I'm trying to decide what to do. By checking the values of the passives I see that the inductor is 47uH while on the datasheet the suggested value is 1.5uH, can this cause problems such as excessive noise? Or did we choose the wrong dcdc for a sub-GHz application?
Thank you,
Davide.