MP2625BGL with no battery connected

Battery Management
1

Our product in some configurations needs to use the MP2625BGL chip without a battery connected. It appears, though, that it cuts off the output current at SYS pin at quite low threshold (100 mA or so), unless we connect a real battery to BATT pin.

What are we doing wrong? We have M0, M1, SYSFB floating.

2

Hi,

Thank you for posting on the MPS Technical Forum.

Since you are floating M0 and M1, I would expect the current to be limited to 2A. 100mA is quite low comparatively. I have a few follow up questions:

  • What are you supplying to the input (IN pin)?
  • What resistor value do you have connected to the ILIM pin?
  • What voltage are you seeing at the SYS pin?
  • For what period of time does the battery need to be disconnected?

Thank you for your patience,

Allison

3

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