Team meeting 29/11/2020

[wassfila]

Topics :

• Status : update of the current state
• Footprint : how to finish the footprints
• create branch for layouting (placing components)
• MOSFET Topic
• v5.1.8 is available !
• Power ORing
• low cost PCB under testing

Status

• Review Actions #58 has as of now 22 / 28 done

Footprint

• to set all components footprints
• issues for some assigned footprints when generating the BOM
• still to be investigated

Layouting

• need all footprints before we can start layouting
• clean annotation (might loos review annotations)

using new version v5.1.8

• to be updated ASAP since Now

Mosfet topic

• we might have up to 16 V in the input
• low power mode (all ldos off)
• high power mode (short time usage of any ldo)
  The off state is more important because that targets the min board quiescent current, and our performance goal.

enable pin

when using the enable pin we have 2 uA quiescent current

one mosfet - how it is now

• switching the ground to win one mosfet
• is it better than enable ? Less than 2 uA ?
  
• (+) win one mosfet
• (+) win quiescent current
• quiescent current in the off state :
• (-) cut ground path instead of power (short circuit errors prone)

two mosfet - how it could be

• (-) the on state (more than 5 uA permanent in the off state) pull down + pull up res
• off state same as one mosfet

Comparison

Overall

Current

Components

Power ORing

• PMOS has a res permanently connected to ground, might not work as expected
• suggestion to replace the top one with a Schottky.
• no clear solution how to fix
  @MantaRayDeeJay will discuss with Seth with suggestion from @Tobi3566