The MP1484 is an 8-pin IC that converts the DC voltage to DC voltage using a 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 is around 3A.
MP1484 Buck converter Circuit Diagram
The input resistance of the MOSFET is about 85 m ohms. The maximum efficiency is 95%.
The output voltage of the circuit is designed using 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)
