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TLV704: Higher fixed Vout

John Garrett
Expert 4210 points
Other Parts Discussed in Thread: TLV704

Hi All,

I have a customer who is asking if the TLV704 can operate at higher Vout via a zener diode to the gnd pin.  I'm not sure what the Vout pin is rated for but they are looking for low cost, SOT23 solution for a 6.0V rail.  The TPS70960 apparently is too costly for them and I haven't been able to find another cost effective adjustable solution with comparable specs.  Please let me know if you have any ideas/inputs.  A longer term option is if the TLV704 can be designed for a fixed Vout of 6.0V?

Please let me know what you think.

Thanks & regards, John Garrett, TI-AFA

  • 0
    TI__Guru 55940 points
    Hi John,

    Due to the fact that all internal circuitry is referenced to the voltage at the GND pin of the LDO, it is possible to use a Zener diode to provide an artificial GND for the TLV704; however, there are a few things to keep in mind when doing this:

    You may choose to have additional capacitors between the Vin and Vout rails and true GND; however, in order to properly compensate the LDO control loop, at least the minimum input and output capacitor must be connected to the same artificial GND as the GND pin.

    In order to provide the artificial GND, current must flow through the Zener diode. The ground pin current of the TLV704 may not be enough to ensure that you are setting your artificial GND at the voltage you desire; therefore, you may want to use a resistor from the LDO IN to the artificial GND in order to set the proper current.

    As with any design, we recommend prototyping the solution in order to ensure you are achieving your desired performance.

    Very Respectfully,
    Ryan