driving high and low side mosfet for synchronous buck converter?

I am designing an MPPT charge controller. I have chosen my MOSFETs to be both NMOS https://www.sparkfun.com/products/10213 (FQP30N06L) 60V, 30A. Since the gate voltage is 3 to 5V. I can drive the low side, however, how can drive the high side? since $$\V_g\$$ should be higher than $$\V_s\$$, which in this case is $$\V_{in}\$$ (around 37 V). A lot of people say using a half bridge driver. But also there is a problem. The output voltage is present always (battery voltage), which causes a problem for the driver.

input voltage is 5-37V and I max is 9A the shared node is Dutycycle*Vin during Ton and it is 0.7V during toff

Any suggestions?

• Please provide circuit diagrams / schematics – Andy West Apr 12 at 7:22