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TPS63020-Q1: Automotive, High efficiency, Low current non inverting buckboost with Vin>10V

Miguel Aguirre
Prodigy 70 points
Part Number: TPS63020-Q1
Other Parts Discussed in Thread: BQ25798, , TPS63020, TPS63000

Tool/software:

Hello!

We need to obtain 3.3V from a 1S1P Li-Ion battery pack, using a BQ25798 as charger.

The problem is that when the battery is not connected and the input VAC1 is over 12V, there is a chance of having more than 5.5V in the VSYS output, which is the maximum input voltage of the TPS63020-Q1 we were planning to use.

So, we were looking for a BuckBoost converter with the following specs. We couldn't find any in the TI portfolio, but we must be missing something, can you help us with our search? 

- AEC-Q100  compliant

- Non inverting buckboost with integrated switches

- Output current up to 200mA (average 100mA, 10mA in standby mode)

- Output voltage 3.3V fixed (internally or externally)

- Input voltage from 2.5 to 10V

- Efficiency over 85% @100mA

- Switching frequency over 200KHz (better if over 1.5MHz)

- small SMD package

Question 2: It looks that Vin = 7V hits some kind of technological threshold. We can find many devices with low output current and Vin < 7V (as the TPS63020), but when Vin is over 7V it seems that there are no devices with low output current available.

Is there really any technological issue for having low current converters with Vin > 7V?

Thanks in advance!

Miguel

  • 0
    TI__Mastermind 32350 points

    Hi  Miguel,

    I am afraid we do not have a BUBO to fully meet your request.

    For low Vin BUBO, i mean 5.5V lower, we have only TPS63000 and TPS63020 have AEC-Q100  compliant.

    For middle Vin BUBO, we can not support 2.5Vin, if my remember is correct, minimum vin should be 3V for these device. Also, it is a large overkill for output current.

    haha, actually, no technological issue to having low current converters with 7V higher Vin,  it is depend on marketing, because for most application, high current is a must feature for buck-boost device when Vin is higher.Grin

    Regards

    Tao