TPS61091: What happens if VBAT is 5V on the 3.3V version(TPS61091RSA)?

Clemens Leitner

Part Number: TPS61091
Other Parts Discussed in Thread: TPS63802

We have a design with a TPS61091RSA which is powered with 5V on VBAT. We expected a output on VOUT of 3.3V. If we power it with 1.8V the ouput is as expected 3.3V. Is this chip able to Buck Convert?

over 3 years ago

0 Minqiu Xie over 3 years ago

TI__Mastermind 21565 points

Hi Leitner:

It's a boost converter, which mainly support Vin<Vout. If you want to regulate 3.3V whether Vin is higher or lower to that, I will recommend you have a look at BuckBoost converter, Like TPS63802

0 Clemens Leitner over 3 years ago in reply to Minqiu Xie

Prodigy 20 points

Hi Minqiu,

Thanks for the fast answer. It would be helpful to add this information in the Datasheet since there is conflicting information regarding input and output voltage. When max Input is 5 Volt and and max output is 3.3v it suggests that there is also a buck converter on the chip.

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TPS61091: What happens if VBAT is 5V on the 3.3V version(TPS61091RSA)?