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TLV61048: Is a boost more efficient at lower Vout-Vin differences?

Derek
Mastermind 9802 points
Part Number: TLV61048
Other Parts Discussed in Thread: TPS61087

Hello,

   I have a system that is powered by three 'C' cell batteries, nominal voltage 4.5V and decreases to 4V as they are depleted. We are using this to power a motor. Motor comes in two versions; one 5V and one 12V. I've measured motor efficiency and found that both these motors are equally efficient. I'd like to maximize overall system efficiency. So for the boost circuit, is it more efficient to go from 4V to 12V, or 4V to 5V? Motor draws about 0.5A to 1.0A.

I am currently using TLV61048DBV boost converter but can change that if needed.

Thanks,

Derek

  • 0
    TI__Expert 5180 points

    Hi Derek,

    If boost need to go from 4V to 12V and output 1A, I am afraid TLV61048 cannot output such big current because its min peak current limit is only 2.9A. If it only output 0.5A at 12V, then TLV61048 is okay.

    How about TPS61378? Its Efficiency is higher than TLV61048 because of Synchronous Boost Converter and can integrate the high side mos. TPS61378 peak current limit is higher too and the price will be a little higher.

    TPS61087 is also suitable but the efficiency will be lower than TPS61378, and price lower.

    Best Regards,

    Eric Yue