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I'm designing a LiPo battery charger using MP2617 power management IC. When I referred to the datasheet it tells that these ICs have an internally integrated voltage regulator for the battery charging. Now my problem is this IC was rated up to 5-14V as Input. Now I have solar panel rated up to 12V/3A. But as it's a solar panel power source the voltage was not constant at all situation, so did I need to integrate an external voltage regulator(LM2596) to step down the input voltage from the solar panel to make the supply of MP2617 constant?

Thanks in advance

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  • \$\begingroup\$ The MP2617H operates from Vin from 4.5 to 14V, wide operational range. Why do you think you need the input voltage constant? \$\endgroup\$ – Ale..chenski Apr 7 at 21:25
  • \$\begingroup\$ @Ale the range in the sense is it a constant voltage in between that voltage or a changing voltage within that range. \$\endgroup\$ – Yana Apr 8 at 17:40
  • \$\begingroup\$ One major feature of a power supply regulator is to maintain its output constant while the input varies. That's why it is called "regulator". So the ability to handle input variations is built in. As an example, in many cases the input variations have deep ripples from primary rectification, and the voltage regulator must handle them. \$\endgroup\$ – Ale..chenski Apr 8 at 19:01
  • \$\begingroup\$ So are you suggesting the direct supply of solar panel to MP2617H is no harm to the entire circuit and no need an external regulation? \$\endgroup\$ – Yana Apr 8 at 19:18
  • \$\begingroup\$ I don't know anything about characteristics of your solar panel, so I can't suggest much. But if its peak output voltage doesn't exceed 14 V under any light conditions, then it should work directly. On low light the MP2617 should enter undervoltage mode, and the charger will shut itself down. How to deal with fixed current limitation, I don't know. Solar power generation apparently has some specifics, and MP2617 doesn't mention the solar field in their datasheet. You probably should look into specialized offerings elsewhere to make this determination. \$\endgroup\$ – Ale..chenski Apr 8 at 19:42

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