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Enabling/Disabling OP-AMP with Ena of LDO

DeWei Lan
Prodigy 250 points
Part Number: OPA2810
Other Parts Discussed in Thread: SN74LV4053A, TMUX1133

I have OPA2810.

My LDO is TPS7A2050

I'd like to enable/disable OPA2810 with EN of TPS7A2050.

Is this okay?

My circuit as this picture:

Signal from source fanout to OPA2810,

I'd like control some channel can output and some channel can't output.

Since OPA2810 has no enable function, I'd like to implement enable with ENA from LDO.

  • +1
    Guru 275410 points

    It is not allowed to apply a voltage to a powered-down output, as this can (partially) power up the opamp; see figure 63.

    You need to use an opamp with shutdown function, or add analog switches (2x SN74LV4053A/TMUX1133) to disconnect all I/Os.