Power Designs for Li-Ion

Hello GOT,

Thank you for posting to the Forum.
In order to assist you better, please answer these questions:

1. How many series/parallel cells will you be using, xSxP, that will determine the pack voltage?
2. What output voltage, or voltage range, are you needing to obtain?

I look forward to your reply.

Answered ur questions as below:

1) 1cell only - 3.7V 1500mAh Li-Ion Battery

Hi GOT,

What do you mean by feed through mode? Is it the same as 100% duty cycle operation?

TPS62826 (buck converter) supports 100% duty cycle as VIN approaches VOUT (VIN_min = Vout + Iout_max * [Rdson + Rload). On the other hand, the 3A device looks an overkill for your application. You can consider TPS62821 (see attached file) which is a 1A part.

By the way, is it correct that you intend to convert 3.0~4.2V input to 3.3V output? If that is the case, then you should consider buck-boost converter instead.

Best regards,

Excel

tps62821.pdf

Hi GOT,

Just a soft reminder.

Do you have time to check on my queries above?

Best regards,

Excel

Hi GOT,

Is your issue resolved? Let us know if need further support.

Best regards,

Excel