soft-start in SC charge pump regulator

[schwang1970]

1 Did anyone know that the SC charge pump need a soft start circuit?
2 What is the purpose of soft start circuit?
Thank you!

 

[tsanlee]

1 Did anyone know that the SC charge pump need a soft start circuit?
2 What is the purpose of soft start circuit?
Thank you!

1.
I think that we do not need soft start circuit in charge pump circuit.
beacuse the flying cap is so small, in charge phase the inrush is so samll.
Note:Charge phase :the VIn charge flying cap.
Discharge Phase :Flying Cap discharge to Vo.


2.
The Soft Start purpose.
1.reduce vin inrush current.
2.smooth vout waveform.