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Ultra Low Power Op-Amp for 12V Battery, Output to 0V, <100uA Supply Current?

24 9
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  • #1 21683133
    Graham Rounce
    Anonymous  
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  • #2 21683134
    Elizabeth Simon
    Anonymous  
  • #3 21683135
    Chip Fryer
    Anonymous  
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  • #4 21683136
    Graham Rounce
    Anonymous  
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  • #5 21683137
    Konstantinos Ifantidis
    Anonymous  
  • #6 21683138
    Konstantinos Ifantidis
    Anonymous  
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  • #7 21683139
    lea lovelea
    Anonymous  
  • #8 21683140
    Leslie Woods
    Anonymous  
  • #9 21683141
    Mark Wagner
    Anonymous  
  • #10 21683142
    Richard Gabric
    Anonymous  

Topic summary

The discussion centers on finding an ultra low power operational amplifier suitable for a 12V battery-powered circuit driving a 20mA relay, with a target supply current under 100µA. The original circuit uses an LM324 op-amp, which draws about 1mA quiescent current, considered too high for battery operation. Suggestions include searching component parameters on distributor sites like Digikey and Octopart for low quiescent current devices. One recommended alternative is the TLC2252CD, a rail-to-rail op-amp with a 35µA supply current and 16V maximum supply voltage, capable of delivering 50mA output current per channel. It is noted that resistor values in the circuit significantly affect current draw, and increasing resistor values to reduce current may introduce offset and temperature coefficient issues. Texas Instruments is highlighted as a leading manufacturer of low power analog devices, with some op-amps offering quiescent currents below 1µA. Overall, careful selection of both the op-amp and supporting passive components is necessary to achieve ultra low power operation.
Summary generated by the language model.
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