Zetex Semiconductors has developed a low cost current monitor producing a current output signal with an accuracy as high as 1%. Housed in the 5-pin SOT23 package and with a wide 2,5 V to 20 V common mode voltage range, the ZXCT1020 provides a versatile current measurement solution for a wide range of applications from low voltage portables through to automotive circuitry. Converting the voltage developed across a sense resistor into a ground referenced current output, this high side current monitor is simply configured using low cost external resistors. As a result, the device output can be scaled independently of the sense resistor, using one resistor to set the transconductance and another to set the overall gain and output impedance. The ZXCT1020's very low on-chip offset trimming provides high performance for very small sense voltages at high current levels. For such conditions, accuracy is further enhanced by the device's very low minimum operating current consumption, typically 25 μA.
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