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Original question:

TPS65217 with 12V Supply

TPS65217: 12v unregulated input?

Omair Khan31
Intellectual 275 points
Part Number: TPS65217
Other Parts Discussed in Thread: TPS54424

Hello,

I am creating a custom device based on the BeagleBoard Black which uses the TPS65217C power management chip.

The device needs to be powered by a 12V unregulated supply with tolerance for 10V - 14.5V. The TPS65217C datasheet indicates it can support a supply voltage range of -0.3V to 20V, however, the recommended operating supply voltage is 4.3V - 5.8V. Can the TPS65217C be powered directly by the unregulated 12v power source without any issues?

Thank you in advance

  • 0
    TI__Mastermind 30310 points

    Omair,

    The datasheet can be a little confusing on this topic, but I want to make it clear the TPS65217 device WILL NOT operate as expected with a 12V (10-14.5V) unregulated input.

    The Absolute Maximum Rating for the AC and USB input pins is -0.3 to 20V. This means the the device will be damaged if >20V is applied at the AC or USB pin.

    The device will operate correctly when the AC or USB input voltage is within the Recommended Operating Conditions range of 4.3V to 5.8V

    There is a spec named VIN(OVP), or input overvoltage detection threshold, that applies to the AC and USB pins which is specified as 5.8V (min) to 6.4V (max). When the overvoltage condition is present, the powerpath will open up the switch (AC or USB to SYS) to prevent a voltage of >7V from being present at any of the downstream pins (SYS, VIN_DCDCx, VINLDO, LS1IN or LS2IN) which would cause damage.

    While an overvoltage condition is present, the DC-DC converters and LDOs will not work because there will not be a voltage applied at the input (from SYS).

    In order for the device to operate as expected, you will need a pre-regulator to go from 12V to 5V nominal. The TPS54424 is one of many devices that will work in this system.

  • 0 in reply to Brian Berner
    Intellectual 275 points

    Hi Brian,

    Thanks for the clarification and recommendation. Greatly appreciated.

    Best Regards,

    Omair