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About sharing power source

Tsukui Yusuke
Guru 21930 points
Other Parts Discussed in Thread: TPS25942A, TPS25200

Hi,

Customers want to share two power sources.
Please confirm the attached file.
Power source share .pdf
Could you introduce TI device and solution that can share two power sources?
Customer want to be able to secure current from both power sources.

And I found TPS25942A as a candidate device.
Can TPS25942 realize the attached file required specifications?

Best Regards,
Yusuke/Japan Disty

  • 0
    TI__Guru** 105811 points
    Hi Yusuke-san,

    TPS25942A can be used in ORing configuration as mentioned in Figure 74 of the datasheet. However, current sharing between the paths depends on the impedance (or the effective voltage drop across each device) of the respective power paths.

    Please note that these devices need to pass some amount of reverse current to detect the reserve voltage condition and turn-off the device. Refer Section "9.3.5 Reverse Current Protection" for more information. Also, the minimum operating voltage is 2.7V. I suggest to test and evaluate the system functionality using EVM along with batteries

    Best Regards,
    Rakesh
  • 0 in reply to Rakesh
    Guru 21930 points

    Rakesh-san,

    Thank you for your response and support.
    Let me ask you one more thing.

    Do you have a device that can operate at 2.5V?
    Customer uses the battery voltage until it reaches 2.5V.

    Best Regards,
    Yusuke/Japan Disty

  • 0 in reply to Tsukui Yusuke
    TI__Guru** 105811 points
    Hi Yusuke-san,

    We have 5V efuse TPS25200 which can work starting from 2.5V.
    This device has current limit function but needs to be disabled for Reverse Current Blocking. This may lead to scenario of one battery charging the other battery when their voltages are at different level.

    Best Regards,
    Rakesh