I have fairly simple design for a small torch, but I am having trouble getting low standby current. Right now I can measure about 35mA. So far everything points to MP2672A chip. I see the current on the shunt resistor confirmed with multimeter. There is no difference in current if I set EN_SUSP to 0. Vbus is 0V during measurement.
I don’t quite see the problem in my setup, so I thought I will ask here. Technically I could desolder the shunt to double check if this chip is the real issue, but I would like to avoid doing that (it’s assembled and it’s quite complicated to disassemble the thing).
Here is register dump:
> mpread 0
Reg 0x00: 0x28
> mpread 1
Reg 0x01: 0x8F
> mpread 2
Reg 0x02: 0x85
> mpread 3
Reg 0x03: 0x00
> mpread 4
Reg 0x04: 0x00
And schematic:
Thanks for all advice!