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TPS61094: LiSOCl2 with hybrid super capacitor

Part Number: TPS61094

I am evaluating if TPS61094 is a good part in combination with a LiSOCl2 battery and an HLC to power CC32xx.

(1) short-duration peak power requirement is around 450mA

(2) the inputs of CC3235 have a wide tolerance of 2.1V to 3.6V

(3) HLC should not be discharged below 2.2V

(4) the battery should not be loaded by more than 10mA

In "A Long-Lifetime, Cost-Competitive Solution in Smart Meters Based on the TPS61094", you used an EDLC with a much higher specified leakage current (figure 5-1 shows around 10uA at 2V, while the notes on page 8 assume 1uA for 3F and 2V, which would need to be measured and tested long-term).

In this configuration, the boost-mode of TPS61094 is not required (both the battery and the HLC voltages can be fed to CC32xx directly), so I wonder if the chip can still be used advantageously (buck-charging the capacitor) or if it's too restrictive (the voltage levels are fixed and it's not clear if the capacitor target voltage can set higher than the target output voltage at all.

Do you have any experience with this combination or recommendations for alternative parts?

  • Hi J,

    Thanks for reaching out on E2E. As you may read in the app notes, LiSOCl2 battery and HLC direct battery connection solution has disadvantage of big HLC size and uncontrolled discharge current. For TPS61094, it can supply stable output voltage which can be set as suitable CC3235 input, and cost competitive with the super cap Control LiSOCl2 discharge current and end-off voltage Automatically transition; No need for MCU control.

    TPS61094 is one boost converter transfer from super cap to output, the cap voltage should be lower than Vout. But I think the output can be set to about 3.3V? do you have any concern for this design?

    Best Regards,

    Eric Yue