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Original question:

LM27762: Is it possible to get +/-5Volts using the LM27762?

LM27762: Slightly higher -5.2V output possible?

Holger Klein
Prodigy 25 points
Part Number: LM27762


Tool/software:

Hello TI Support Team.

The datasheet limit of the LM27762 for the negative V output is -5.0V. For a non-production board, is it possible to go to -5.2V Vout- from a +5.2V  Vin input supply voltage?

I would set the resistors to 324kOhm and 100kOhm to achieve 4.24 x 1.22V = -5.173V output.

Thanks

Holger

  • +1
    TI__Mastermind 21580 points

    Hi Holger,

    This may be alright for a non production test board. 

    It might be better to tap the negative output directly at CP pin. You could then avoid the dropout voltage across the LDO. The positive voltage probably still has to be a few 100mV higher to account for the voltage drop across the charge pump output impedance. 

    Best regards,

    Varun