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TLV3201: Comparator with Vcm= -0.3V

Shinu.V.Mathew
Expert 8225 points
Part Number: TLV3201
Other Parts Discussed in Thread: LM2903, LM2903B

Hi Team,

My customer is looking for a comparator with at least Io=10mA and Vcm= -0.3V for Single supply +5 or +10V.

 Identified few devices. TLV3201, device is having push-pull output and can't directly drive 10mA. 

 For LM2903 VOH is not clearly mentioned in datasheet.

Can you please help with right device.

Regards, Shinu Mathew. 

  • 0
    TI__Expert 8225 points

    Hi Team,

    Can you please confirm that LM2903 can be used for below application.

    Vcm=-0.3V

    Io= sink current >10mA to 12mA

    VOH aprox. 4.5V

    VOL approx. 0.4V@10mA sink current

    Regards, Shinu Mathew.

  • 0 in reply to Shinu.V.Mathew
    Guru 140200 points

    Hi Shinu,

    no, with these requirements the LM2903 cannot be used:

    Kai

  • 0 in reply to Shinu.V.Mathew
    TI__Guru 55306 points

    Hello Shinu,

    As Kai said, the output current is too much.

    If you look at Figure 3, >10mA is getting into current limiting range (the curves bend up), so the output low voltage will be variable between units.

    We recommend sinking currents less than 5mA.

    The LM2903B should be able to handle the common mode, but the 10-20mA is better handled with an external transistor or MOSFET.