Hello,
I have trouble understanding what is the role of the pins in the chip. some of the pins are doubled, im cofuse. the type of the mosfet driver is MIC4452YN.
Thanks for helping.

 

hi David,
Check this clip from the d/s.
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EDIT: Those pin pairs are internally connected.

 

They are just what the datasheet says they are - duplicate pins that must be connected together externally. The reason for this is that the part can supply very high peak current with very high slew rate and use of multiple pins for the high power paths improves performance by lowering both the inductances and resistances in the paths. This is common for several types of small surface mount packages when they are used for power applications.

Pay close attention to the datasheet recommendations for decoupling for this part. Inadequate decoupling can seriously compromise its performance.