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bq2000 trickle charge pull tps63031 low for a moment

Nicola Barbon
Prodigy 70 points
Other Parts Discussed in Thread: TPS54227, TPS63031, BQ2000

Hello,

I have a circuit with a bq2000 for a battery pack charge, a tps63031 for the 3.3V derivation and a tps54227 for the 5V derivation. bq2000 and tps54227 input are in common (power supply) and both output are in common and it is the tps63031 input. If I do not out the battery pack, the bq2000 remains in trickle charge and I can see the 1 Hz impulse on the input of the 63031. the 5v out of the 54227 is ok and let the 3.3v regulator to work correctly apart when the trickle pulse arrive and I can see the oscillator stopping for a while and the output going down during the pulse.

If I put the battery pack all it's ok.

Any idea?

Thanks

Nicola