BTW, if you take a look at a buck-boost topology, you'll note that by keeping the output high side MOSFET on, the circuit degenerates to a buck topology. Built in signal conditioning would be nice to reduce the parts needed to allow the microcontroller to measure voltages and currents. What I would like to see is a MOSFET gate driver designed to be driven from the PWM output of any microcontroller, with adjustable built in cycle by cycle voltage and current limiting. As long as the output voltage is below the setpoint, the duty cycle would try to go to the maximum supported by the controller, which the microcontroller holds back to do MPPT. One way to do that is to tap into the compensation network of a standard PWM controller and allow a microcontroller to limit the duty cycle. Any converter topology can be used for MPPT.
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