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TPS61070: Right boost converter for hall effect sensor and eventually 3.3V logic

Part Number: TPS61070
Other Parts Discussed in Thread: TPS61099

Dear Texas-Team,

I am searching for a boost converter to power the honey well SS495X-series of hall effect sensors:

That at minimum need an input voltage of 4.5V (7.0mA supply current at 5V supply voltage). I have thought about using a TPS61070 that should do the job.

II would be happy if you took a look at following questions:

- Can you recommend a boost converter that serve as a supply voltage for sensors? I guess the ripples should be quite low.

- My project should run on a lithium 3.0V coin cell, either the standard CR 2032 with a diameter of 20mm or the CR 1225 with a diameter of 12mm.

- I am also considering to use a LR 44 button cell with the same diameter as the CR1225 but 3x capacity. Then, I might need a boost converter for 3.3V and for 5.0V or: I just boost up to 5.0V and use 2xdiodes. What do you think about that?

Thank you and best!

  • Hi Markovicz:

    I'll recommend TPS61099, as it has smaller solution size and higher efficiency and lower quiescent current. It could supply 5V well from difference type batteries as it can support wide input voltage range.

    And in other side, may I know why you need 3.3V? Is there any additional load?

  • Dear Minqiu,

    Wow, that's really an excellent boost IC for my application. Thank you!

    However, I can not source it from my PCB & SMT assembly supplier. Could you - eventually if you have the time - recommend other boost converters?

    The 3.3V would just be my convenient voltage since I just it for pretty much everything but the microcontroller accepts it and for the modules around like bluetooth that only accept up to 4V, I can use a simple voltage divider or logic shifter.

    Best and thank you!

  • Hi Markovicz:

    It's really a pity to hear nor source for it.

     TPS61070 is not the most recommenced, but it should be OK. Please take attention that it need input voltage higher than 1.1V(typical) to startup.