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SOT26

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ZXCT181Q

Automotive, 26V, 400kHz Bandwidth Bi-Directional, Low-Side and High-Side Current Monitor

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Description

The ZXCT181Q is automotive AEC-Q qualified 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 ZXCT181Q 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 ZXCT181Q 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 ZXCT181Q 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

Feature(s)

  • Supply Voltage Range: 2.7V to 5.5V
  • Wide Common-Mode Range: -0.3V to 26V
  • Gain Error: (Maximum over Temperature): ±1%
  • Choice of Gains:
    • Version A1: 20V/V
    • Version A2: 50V/V
    • Version A3: 100V/V
    • Version A4: 200V/V
  • Low Offset Voltage: Typical ±100μV and 1-µV/°C Drift
  • Rail-to-Rail Output Capability
  • Low Quiescent Current: 300μA (max)
  • Package: 6-Pin SOT26
  • ESD Protection JESD 22, 5000V HBM (A114)
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The ZXCT181Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. https://www.diodes.com/quality/product-definitions/

Application(s)

  • Vehicle valve controls
  • Vehicle body control systems
  • Vehicle motor controls, e-pumps
  • Vehicle lighting controls
  • Fault current detection
  • Wireless charging
  • Current sensing (high-side/low-side)
  • Battery charging and discharging

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Automotive
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

Related Content

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Technical Documents

Recommended Soldering Techniques

TN1.pdf

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.