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TPS63001: Power options for battery powered devices (when using rechargeable LiPo and when using primary Li cells)

Eric Lenington
Prodigy 200 points
Part Number: TPS63001
Other Parts Discussed in Thread: BQ24298, , LM3668, TPS63010, TPS630252, TPS62130

There is certainly no lack of power options for battery-powered devices (and that's just from TI)! I have two different use-cases that I'd like to get some guidance/feedback on:

1) Rechargeable LiPo powered device
2) Primary-Cell powered device (using an of: 2x1.5V Li-FeS2; 1x3V Li-MnO2; 1x3.6V Li-SOCl2)

In both cases, the desired working voltage is 3.3v, typically under 100mA with short bursts of up to 1200mA (both devices include a radio transmitter).

The LiPo device has a simpler power requirement, because the discharge curve of the LiPo battery never drops below 3.3v, but I also need a charger, so maybe something like a BQ24298 (although this isn't ideal, as my available charge voltage is 12-14v) with an LDO on its output to provide clean 3.3v?

The primary-cell device has some configurations where the battery voltage will always be below 3.3v and all configurations where the discharge curve will take it from 4.2v to under 3.3v, so in this case, I've been exploring two options: 1) a buck-boost converter like the TPS63001 or LM3668; and 2) a boost-only converter, with pass-through when the battery voltage > 3.3v, plus an LDO to regulate to 3.3v. I've seen various references (one from Maxim) that show applications where the second option is more efficient (but that admittedly comes with a lot of specific "requirements").

Thank you in advance.

  • 0
    TI__Expert 8420 points
    For the second option I would recommend to use a buck boost to achieve higher efficiency. The TPS63001 seems to be at the limit for delivering 1.2A at lower input voltages (according to figure 1 of the datasheet), but this needs to be tested. Can you describe your load profile? Is it for a GSM pulse pattern?
    Did you take a look at the TPS63010/20? These have higher capabilities besides unlike the TPS63001, these two have higher switching frequency
    Do you have any package restriction?
  • 0 in reply to Sabrina
    Prodigy 200 points

    Thank you for the input. Since posting, I've been doing more research, and my current plan for the second requirement is to use a TPS630252. I did indeed consider the TPS63010/20. It's really idea from an electrical standpoint, but since it's only available in a BGA package, it didn't make the cut (there are no other BGA packages on either design, so adding one is undesirable from a manufacturing cost standpoint). The TPS630252 seemed like the best "next alternative".

    And yes, the load profile is for GSM.

    By the way, for the first project, my current plan is to stay with the BQ24298, fed from the 12V source through a TPS62130 buck converter providing 5V (the TPS62130 can be enabled via logic control, so this arrangement also gives me a convenient way to switch the power to the BQ24298). The loss from the TPS62130 is trivial, especially since the LiPo battery is only be charged occasionally.