Other Parts Discussed in Thread: LM358, OPA2171, INA180
My customer wants to use amps for high side current sensing in the battery application. Their challenge is that when the battery goes into sleep mode, there will be undesirable current going to amps, which will cause energy loss. So they conducted the below tests for the input current of different amps when there is no power supply.
Test condition: Vcc floar, Vin=8.4V
Test results:
TLV2171:VCC=3.13V Vo=1.3V Iin=3.9mA
LM358:VCC=6.6V Vo=6.6V Iin=21.7mA
IN180:VCC=50mV Vo=0V Iin=32uA
The question is that how to explain such a high input current for TLV2171 and LM358, same as OPA2171. And is there any suggestion on how to reduce this current? They wonder whether choosing a amp with higher input resistor will help, but the input resistor of TLV2171 is already 100M ohm.