Hello, I have designed a PCB with the TPS82130. We needed a small regulator to be able to handle 5-12V inputs and provide a 4.5V output at higher currents (typically <100ma but potentially up to 2A). My issue is that in this design I have the TPS82130 taking the battery input (12V LiPo) and regulating to 4.5V then we have a small linear regulator to take the 4.5 to 3.3V for the processor and radio. Most of the time when power is applied all is fine but occasionally the signal indicator (Packet Deliver Rate) of the radio shows reception is degraded. I have scoped the power lines and do not see any difference in regulation from it operating normally and with PDR degraded. I usually just power off and power back on and it's fine. Sometimes it takes a few cycles and sometimes it starts the first time just fine. I am inquiring to see if you have come across this behaviour and what might be the root cause? In this scenario we are not running large currents on the 4.5V bus, but wanted the ability to be able to if we needed. So I presume it is operating in the Power Saving Mode as per the datasheet. Is this maybe an issue that could be resolved with using a different value for SS capacitor than the default 3.3nF as per the datasheet? The input capacitor is 10uF and the output is 33uF. I am wanting to use this regulator in other designs as the performance and size can't be beat (size is our most important factor). I am just trying to understand what I might be able to look into to diagnose this issue. The total size of the controller pcb is .708"x1.15" and the radio backpack is .708x.900". The radio is a receiver only on the 2.4GHz band, technically it's a CRMXchip receiver by Lumen Radio for wireless DMX.
Thank you for your time.
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