TPS61022: Paralleling Outputs

Hi Kato,

This is an interesting idea.

Since two TPS61022 regulates output voltage separately, it's not able to keep two inductor current the same. So you can configure the first TPS61022 output voltage a little bit higher than second TPS61022 Vout, such as Vout1=5.35V, Vout 2=5.25V. When load current is light, first TPS61022 hasn't trigger current limit, so only first TPS61022 is switching and delivering power from input to output. After first TPS61022 current limit is triggered, Vout1 starts decreasing and second TPS61022 begin switching to provide the rest output power. 

You can buy or apply for TPS61022 EVM and try this idea.

Hi Kato,

I used to do a similar design using two Boost converter in parallel like that. It works well. But at full load current conditions, first boost converter temperature is high because it's working at the maximum power capability. Heat might be a concern.

Another way is using a boost controller LM5155. Supply LM5155 BIAS pin with another power rail generate by a cheap boost converter TPS613222A.

Hi Kato,

That's good, exactly the same with what I mean.