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SOT26-Chip-Image.png26V, 400kHz Bandwidth, Bi-Directional Low-Side and High-Side Current Monitor
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The ZXCT181 is a current shunt monitor which is designed to be a cost-effective solution to deal with 26V common-mode and a smaller supply voltage range 2.7V to 5.5V powering the device.
The ZXCT181 supports the small-signal bandwidths as high as 400kHz at 20V/V gain and fast large-signal slew rates of 2V/µs. This ability can be used to detect rapid changes in the sensed current and fast response to the output so that these features make the ZXCT181 a good choice for applications such as low-side motor control and the system fault current detection.
For the bi-directional current sense, it can be achieved by applying a voltage at the REF pin to offset the output voltage. Likewise, tie the REF pin to GND to be a unidirectional current monitor. In unidirectional applications, if measuring a very low input current is desirable, the REF pin connecting to GND may result in an inaccurate measurement so that putting a bias voltage above 50mV on REF pin is recommended to make the output into the linear range of the device.
The ZXCT181 series has four fixed voltage gain options in 20V/V, 50V/V, 100V/V, and 200V/V. It can measure voltage across shunts at common-mode voltages from -0.3V to 26V, independent of supply voltage with a maximum supply current of 300μA. All versions are specified with temperature range of -40°C to +125°C, and available in SOT26 package.
| Compliance (Only Automotive supports PPAP) | Standard |
|---|---|
| AEC Qualified | Yes |
| Type | Voltage output |
| Minimum S+ Common-Mode Sense Voltage (V) | -0.3 |
| Maximum S+ Common-Mode Sense Voltage (V) | 26 |
| Minimum VCC/VB Supply Voltage (V) | 2.7 |
| Maximum VCC/VB Supply Voltage (V) | 5.5 |
| Maximum Output Voltage (V) | (VS) - 0.03 |
| Voltage output Gain VOUT/VSENSE (V/V) | 20, 50, 100, 200 |
| % Accuracy @ VSENSE =100mV Ta (%) | 1 |
| Quiescent Current (µA) | 250 |
| Bandwidth typ (MHz) | 0.085 to 0.4 |
| Operating Ambient Temperature Range (°C) | -40 to 125 |
| Special Features | Bi-direction, high bandwidth |
Diodes Incorporated's current monitors are high-performance, high-side/power rail current measurement ICs. They greatly simplify the measurement of load currents without disturbing the ground plane/reference point.
The current monitor families contain variants with quiescent currents as low as 3µA, and others with operating voltages up to 60V, proving solutions for overcurrent detection in consumer, industrial, and automotive applications. The portfolio includes current output variants which via an external resistor to ground to provide adjustable gain, and voltage output variants with fixed gains.
Automotive-compliant variants are available which are qualified to AEC-Q100 Grade 1 in IATF 16949 facilities supporting PPAP documentation.
