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TPS74012 regulator

Dinesh Kasunjith
Prodigy 30 points

Hi All,

is it necessory to give  bias voltage to TPS74012 when we are using it in fixed operation mode. what happens if we did not give a voltage to bias pin 

  • 0
    TI__Expert 8905 points

    Hi Dinesh,

    A bias voltage is required for this device.

    The bias voltage is used on high current devices to allow for a really low dropout specification, reducing the power dissipation across the LDO.

    An example of this with the TPS74012:

    If Vin=Vbias, Vin(min) = 1.2V+1.6V = 2.8V. Pdiss = 1.6V*1.5A = 2.4W are dissipated across the device.

    But if Vbias = 3.3V, Vin(min) = 1.2V+0.3V = 1.5V. Pdiss = 0.3V*1.5A = 0.45W are dissipated across the LDO, nearly a 2W reduction in power dissipation.

    Regards,

    David