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TPS65094: Powering intel apollo lake from single cell li-on

JAP
Intellectual 2410 points
Part Number: TPS65094
Other Parts Discussed in Thread: LM2767, TPS61252, LM2665

Dear Experts,


I'm looking for a solution for powering intel apollo lake from single cell li-on. TPS65094 would be a perfect match but it is supporting voltages of 5.6V or higher, which is not reaching low enough. Adding a boost converter in front of a PMIC is not attractive solution so what would be the best way to tackle this?


Thanks!

Rgds,

Juha

  • 0
    TI__Mastermind 30280 points
    Juha,

    I have assigned this post to the expert on the TPS65094 and similar devices who will respond to your inquiry as soon as possible.
  • 0
    TI__Genius 17380 points
    Hi Juha,

    TI's Intel approved solution is the TPS65094 family. Any other options would not be Intel approved (and hence would not have software supported by Intel). In previous generations we had a discrete option as well but we don't for this family. We would recommend customers use 2S battery since Intel does not support 1S battery systems as they are not expected to be able to provide sufficient power for the processor during peak loading. If they require 1S, the boost is required.
  • 0 in reply to Kevin LaRosa
    TI__Intellectual 2410 points
    Hi Kevin,

    Ok, thanks. Do you know is there 1-cell intel approved solution available from any other vendor?


    Rgds,
    Juha
  • 0 in reply to JAP
    TI__Genius 17380 points

    Hi Juha,

    Not to my knowledge. The UVLO spec for the consumer PMICs was 5.4 V and I haven't heard of our competitors breaking this. The UVLO spec for the industrial PMIC is 4.2 V I believe. For the discrete parts, there is no fixed spec for UVLO, however the one featured on the discrete reference design has a VSYS min of 4.5 V. So, none of the reference designs support 1S implementation for Apollo Lake.

  • 0 in reply to Kevin LaRosa
    TI__Genius 17380 points
    Hi Juha,

    Let me clarify here as well.
    While there is no avoiding a boost for the VSYS pin of the PMIC, this pin does not draw much current. Typically it is 65 uA, with only a brief inrush during start-up. This pin has the UVLO detection. It also powers the internal LDO3P3 and LDO5P0. For a 1S architecture, the LDO5P0 can be used to provide the gate driver voltage which is ~60 mA max; so the boost should supply at least 60 mA; 100 mA typically recommended. LM2767 has been a popular low cost option, LM2665 is more popular for conservative designs, and TPS61252 for cases when LDOA1 (also powered from VSYS) is used; but customer typically has a preferred boost option that will work for this signal.

    Meanwhile, power inputs (external FET input for controllers BUCK1, 2, & 6 and PINx / V5ANA for converters BUCK3, 4, & 5) are run directly off the 1S battery. This hasn't been validated by Intel team, so we recommend customer validation be sufficient rigorous for their use case.