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BQ24172: BQ24172 DPM

Part Number: BQ24172

Dear Sir,

I am using BQ24172 as our battery charger. The Adapter source is 30W MAX.

Currently, we are charging the battery while the system is working with 17Watt load.

our battery charger specification : Ichmax=2.6A for 2S2P battery. (Battery Pmax=  4.2V*2.6A= 21.8W)

We monitor the Ich current just only 840mA  which is around 7Watt. 

For adapter Max 30W limit, it still have 13 watt , why Ich be limited?

In addition, once  I turn off the system load (17watt), the Ich becomes 2.5A. 

is this limited by IDPM? Thanks.