Hi,

I'm currently doing a solar and wind hybrid controller, with a solar panel of 17.6V and 3.69A at max power and I'm currently searching on suitable IC acting as a buck boost converter to regulate the voltage before feeding the voltage into a battery storage system of 12 V input. There is an MPPT algorithm being used to control the duty cycle of the buck boost converter. Are there any suggestions of any chip can be use as a buck boost converter with an input from MPPT to control the duty cycle?

 

Generally it's not worth running MPPT on a 12v panel into a 12v lead acid battery.

Your panel has max output at 17.6v, and the battery may be charged at 14.5v. An MPPT running at 85% (which is about typical for such a small voltage change) would give you;
IN (65.12W) 17.6v 3.7A
OUT (55.35W) 14.5v = 3.8A

so the total gain from the complexity of MPPT and SMPS gives only 0.1A more current into the battery!

Just use a linear regulator, or buy a typical 5A or 10A 12v solar regulator from ebay for cheaper than you can make it, and they come with little displays too showing volts, amps etc...

 

However, a buck boost converter can step up the voltages and its efficiency is higher compared to linear regulator.

 

A buck-boost SMPS is less efficient than a buck SMPS, and there is no need to "step up the voltage" as the 12v panel always runs at a higher voltage (at max eff) than the battery does under any charge condition.

What is the effect you are wanting to achieve?