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TPS61023: Li-ion power supply

Daki
Prodigy 10 points
Part Number: TPS61023
Other Parts Discussed in Thread: TPS61022

Hi,

I need to design 5 V power supply with Li-ion battery. So, input parameters are Vin= 2.8~4.2 V, and output parameters needs to be Vout=5V and Iout=3.5 A. I intend to use TPS61023 with valley current limit of 3.7 A. I was researching the term of valley current limit on TI forum and came up to conclusion that it can handle 3.5 A output current. This is my design below.

Is my conclusion about TPS61023 output current correct? What is maximum current it can give to output? Will this design work for my output needs?

And also, if I got this wrong, please explain what valley current limit means. Suggestions for design are welcome of course.

Thank you. 

  • 0
    TI__Mastermind 34201 points

    Hi Daki,

    TPS61023 cannot be used in your application. TPS61022 is better choice.

    The valley current limit means the inductor valley current limit. For a boost converter, the inductor is at the input side and inductor average current is the input current. So maximum input current equals the valley current limit + inductor current ripple/2. So you can say 3.7A current limit represents input current limit, not output current limit.

    TPS61022 has higher current capability.