TPS61022: Schematic Review

Hi Kevin,

Thanks for reaching out.

Want to confirm with you first, are the two NiMh/Alkaline batteries are in series or in parallel? May I know the maximum output current of TPS61022?

You are right about the layout. We met a lot of issues so I wrote a application note: https://www.ti.com/lit/an/slvaes4/slvaes4.pdf?ts=1598497539540&ref_url=https%253A%252F%252Fwww.google.com%252F

The two batteries will be in series, with a max current of 1A @ 4.6V.

Thanks,

Kevin

Hi Kevin,

So the input voltage range is 1.8V~3.0V, correct?

1. MODE pin could be connected to GND so the device achieves higher efficiency at light load condition.

2. What's the reason of putting so many 47uF output capacitors? 

3. For your application, two or three 47uF ceramic capacitor is enough. and please set the feedforward capacitor C48 to 12pF. And please add a 1kohm resistor in series with C48 to eliminate the noise coupled to FB pin.

Hi Zack,

Thank you for your prompt reply -- it's very helpful. I've updated the schematic based on your suggestions. If the below looks good, I'll mark this thread as resolved.

Thank you again,

Kevin