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TPS61235P: What are the advantages of this part compared to the built-in boost converter in BQ25895 (aside from max current)?

Part Number: TPS61235P
Other Parts Discussed in Thread: BQ25895, PMP4451, PMP11536

Hi,

In reviewing the PMP4451 reference design, I see that TPS61235 is used to boost the output of BQ25895 to 5V3A.  However, BQ25895 already has a built-in boost converter that can do the same job.  Aside from TPS61235's higher max current (8A), are there other advantages to using a separate boost converter?  If my application only needs 5V3A, is there any reason I'd need TPS61235 in addition to BQ25895, or should BQ25895 be enough on its own?  Reference design PMP11536 also uses the same configuration (just another example).

Thanks very much!

Graham

  • Hi Graham,

    As BQ25895 datasheet says, the device can switch between charge and boost mode. That means if you want to use this device as a boost converter, it cannot charge the battery. When you are charging the battery, you cannot output a 5V. That's why another boost converter is needed.