Integrated info: LTC7000
I'd like to design the circuit with as with as much as less component and size of board. Could i use the SNS- and SNS + pins by connecting them to the source and drain pins of MOSFET.
You can't connect SNS+ and SNS- pins across drain and source pins of the MOSFET. SNS pins are designed to be connected across the current sense resistor. See diagram below.