LP8866-Q1: how much impact for the electronic capacitor place location for the Boost of LP8866/LP8864

Hi, Mengyao

1.We suggest to add a electronic capacitors between PMOS and inductor. If it place before the shunt resistor, it may see some problem during the transient like cold crank.

2.If you have concern about the PMOS. You can place the zenor diode between G and S.

Hello Zhiqian,

thanks for your replay.

about the E-cap can you help to explain details for the transient pulses?

please share me more analysis details?

Hello Zhiqian,

     in my understand, when short cut off the input power and the E-cap discharge trace like the blow picture and will damage the HS MOSFET.

Hi mengyao

Vgsmax = Vin，if no cap before the PMOS during the cold crank or other transient Vgs may not enough to drive the PMOS properly

As Vin is 12V， Vds is not large and may not destroy the MOS