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BQ25190: 2.2uH instead of recommended 1.0uH for switch buck

Ilia Ki
Prodigy 25 points
Part Number: BQ25190

Tool/software:

Hello!

What issues we may have if we use 2.2uH inductor (PLEA67BBA2R2M-1PT00) instead of recommended a 1.0uH inductor for Buck converter?

The circuit consumes no more than 15mA @ 1.8V at peak.

Kind regards,

Ilia

  • +1
    TI__Genius 17955 points

    Hi Ilia,

    I've identified the following limitations for the inductor options available.

    The recommended inductance range for the buck is from 0.7μH to 1.2μH, because the IC design has been optimized for it. When using a bigger inductor then 1.2μH it could have an impact on stability or on meeting the specified performance.

    In general a bigger inductance is used for lower switching frequencies, which then results in lower IC switching losses. But care must be taken for bigger inductance in small package size, because more windings at thinner wire is resulting in a higher DC resistance, which is lowering the efficiency in the end. Another aspect is load transient response performance, where a smaller inductance usually leads to a faster transient response.

    Ultimately, we've not validated nor characterized the device behavior and can't warranty device behavior under the non-recommended component value conditions. This may not be an issue given the low load current of your circuit, but I recommend testing the transient stability and efficiency under your typical and maximum load and temperature conditions to see if that is reasonable for your application.

    Best Regards,

    Juan Ospina

  • 0 in reply to Juan Ospina
    Prodigy 25 points

    Thank you Juan for detailed answer. Could you suggest how can I order this PMIC item directly? It is currently out of stock on the TI website. We need 7000pcs.

  • 0 in reply to Ilia Ki
    TI__Genius 17955 points

    Hi Ilia,

    Unfortunately, I can't resolve that. I recommend reaching out through customer services rather than through E2E. You can also try through a distributor such as digikey.

    Best Regards,

    Juan Ospina