The MP1484 is an 8 pin IC which converts the DC voltage to DC voltage using pulse. The ic has an inbuilt mosfet which provides the load current up-to 3 Ampere The input voltage range of 4.75 v to 18V DC. The output current will be 1.8 ampere and the maximum output we will get around 3A.
The input resistance of the mosfet is about 85 m ohms. The maximum efficiency of 95%.
The output voltage of the circuit is designed using the voltage feedback. A voltage divider circuit is connected to the pinout of SW and it goes to the pin FB.
The output voltage is calculated using this formula
V out = 0.925 * R1+R2/R2The R2 value must be 10K. This value is suggested by the IC manufacturing company. So we can calculate the R1 using this formula.
R1 = 10.81*(Vout -0.0925)Circuit Diagram
