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TCAN4551-Q1: Question about the range of Vsup

Chase Jeong
Mastermind 9965 points

Part Number: TCAN4551-Q1
Other Parts Discussed in Thread: TCAN4572-Q1, TCAN4550, TCAN4550-Q1

Dear TI experts,

My customer is looking for a CAN controller with integrated transceiver.

I think TI has only 2 devices ; TCAN4551-Q1 and TCAN4572-Q1.

The concern is that the range of Vsup is nominal 5.6V, maximum 5.9V.

In the case of startup, Vsup would be lower under 5.5V. It is out of recommended rage of TCAN4551-Q1.

(The recommended range of Vsup is 5.5V ~ 30V in the datasheet.)

  1. Can TCAN4551-Q1 operate normally under the condition of Vsup=5.6V condition? (Startup and CAN/CAN FD operation)
  2. Is there any possibility of going to startup failure or reset or shutdown status if Vsup voltage is going to under 5.5V during startup or operation?
  3. Is it okay to use Vsup=5.9V maximum by buck converter or other power devices?
  4. Do you think it is okay to use Vsup=5.6V nominal and 5.9V maximum conditions?
  5. Should I consider more about the parameters Vsup startup rising time, undervoltage Vsup threshold, power-on reset and voltage drop situation if my customer use  Vsup=5.6V nominal and 5.9V maximum conditions??
  6. Doyou think it is better to use TCAN4572-Q1 than TCAN4551-Q1? (Its range of Vsup is wider than TCAN4551-Q1, 4.5V~36V)

Best regards,

Chase

  • 0
    TI__Mastermind 38131 points

    Hello Chase,

    The TCAN4551-Q1 is the reduced feature version of the TCAN4550-Q1 and TCAN4550 which are also devices that have in integrated CAN controller and transceiver.

    The TCAN4550-Q1, TCAN4550, and TCAN4551-Q1 devices all have an internal 5V LDO that supplies the CAN FD transceiver and requires the VSUP voltage to be greater than 5V in order for the LDO to maintain a regulated 5V supply voltage.  This is why the minimum VSUP voltage thresholds are specified at 5.5V or greater.

    If the VSUP voltage drops below the undervoltage threshold, the internal LDO voltage will reduce and the device will be unable to maintain the required voltage levels specified by CAN.

    The undervoltage rising voltage threshold on the TCAN4551-Q1 is specified as nominally 5.5V, but could be as high as 5.9V therefore a VSUP of 6V or greater is recommended to ensure all devices remain out of undervoltage lockout threshold even though most devices will work with VSUP = 5.5V.

    If the VSUP fails to exceed 5.9V, then some devices may remain in the undervoltage lockout protected state.

    The TCAN4572 is the next generation of this product family and is still in development.  It does not contain the internal 5V LDO, and an external 5V supply must be connected to the device to supply the internal CAN FD transceiver.  This allows a lower VSUP minimum voltage to be used and also allows the device to operate directly off of 5V instead of requiring a greater voltage such as 12V which is assumed as the typical source for the TCAN4551-Q1 and TCAN4550-Q1 devices.

    Regards,

    Jonathan