BC127 -- Fast Transient Filter - Module not booting at times

[tass2001]

Hello,

I’m powering my BC127 from a Torex XC6210 LDO. This works fine 99% of the time, but sometimes the BC127 doesn’t power up because of the voltage drop at startup. The datasheet describes a fast transient filter, but none of the designs I’ve found online implement it. I’m using a fixed 3.3V power supply configuration.

My questions are:

1. Is that a 2ohm or 2k ohm resistor specified?
2. How should the filter be laid out?
   A) Should VCHG be connected between the 2R and the 4.7uF capacitor or should all pins be powered downstream of the filter?
3. Is there anything else I can do to make sure the module powers at boot? My current board revision has a 4.7uF cap downstream of VCHG only, and I’m considering placing it downstream of all 3.3v pins.

Here’s the filter in the datasheet:

This is the circuit I’m considering, along with a 2ohm resistor (not pictured):

Thanks!
-Ted