The current flows through the high-side and low-side MOSFET of the MAX15026 circuit depends on the value of the input and output voltage. When the output voltage is half of the input voltage, the current flows through the high-side MOSFET is the same with the current flows through the low-side MOSFET; when the output voltage is lower than half of the input voltage, the current flows through the high-side MOSFET is lower than the current flows through the low-side MOSFET; When the output voltage higher than the half of the input voltage, the current flows through the high-side MOSFET is higher than the current flows through the low-side MOSFET. PS: The current here is effective value of current instead of transient current or average current.