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LM74670-Q1: Do zero Iq smart diodes use inductors or switched capacitors?

Pongo
Intellectual 270 points
Part Number: LM74670-Q1

Hello,

Does the part# LM74670-Q1 (or any similar zero Iq smart diode) contain any inductors/transformers, or is it switched capacitor based? I don't want any inductors/transformers (not including parasitics). 

Also, for my clarity, the device can step up 0.5 volts to around 6 volts correct?

Thank you,

Mark

  • 0
    TI__Guru 57737 points

    Hi Mark,

    LM74670-Q1 device does not step up 0.5V to 6V. This device is not at all related to step up / step down converters. 

    This device can drive an N-FET which can replace a schottky diode in applications where the diode is used of input reverse polarity protection/blocking. One such application is replacing schottky diodes in full or half bridge rectifiers. 

  • 0 in reply to Praveen GD
    Intellectual 270 points

    Hi Praveen,

    I should not have used the phrase "step up", and I'm clear that it drives an N-fet. The question rephrased is: if 0.5V appears from anode to cathode, will a multiplied voltage of around 6V appear (after charging period elapses) between gate drive pin to anode?

    Also, I'd still like to know whether it contains any inductors/transformers, or is it switched capacitor based instead?

    Thanks,

    Mark

  • +1 in reply to Pongo
    TI__Guru 57737 points

    HI Mark,

    Thanks for your explanation. Your question is clear to me now.

    Yes, the internal charge pump which is based on switched capacitor topology can generate a voltage of up to 6.3V as long as there is a minimum voltage of 0.48V across Anode to Cathode. As shown below, the Gate is turned off for a small duration of time to use the body diode voltage of the FET to generate the charge pump voltage. 

    There are no inductors/transformers integrated in the device. As mentioned above the charge pump is based on switched capacitor topology.