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DV2004HS1 Charging principle

Dear TI,

I have been trying to understand the working principle of DV2004HS1. I want to evaluate a NiMH battery pack ( 7.2v, 2700mAH ). 

My question is

If MOD pin gives PWM pulses that control the switching MOFFET Q2 that provides current control , what are the mosfet Q4 and transistor Q3 for ?

Cheers,

Ganesh