POWER AND LINEAR IC SOLUTIONS

Current Monitor Simplifies High Voltage Circuit Protection

With an extended common-mode sensing voltage range of 3V to 60V, the ZXCT1080 current monitor from Zetex Semiconductors provides a simple solution for high-side current sensing in a wide range of high voltage circuit protection duties in automotive, industrial motor control and power supply applications.



By integrating a gain setting resistor, providing a fixed voltage gain of 10, the device also reduces – to just one – the number of external resistors needed to measure current. The reduction in circuit complexity, combined with the monitor’s SOT23-5 package, allows designers to achieve savings in both solution cost and footprint.

Working from a separate 4.5V to 12V supply voltage, the ZXCT1080 enables its ground-referred output voltage to be closely matched with A/D Converters and microcontrollers and to be protected against harmful over-voltage conditions.

This device is also characterised by a low quiescent current of typically 80µA. This serves to reduce the error incurred in translating the actual current being measured into the input sense current. It also cuts power consumption.

An AEC-Q100 qualified automotive version of the ZXCT1080 is planned for 1Q 2008.

Features

• High voltage high-side current monitor
• 3V to 60V continuous high side voltage
• Output voltage scaling x10
• 4.5V to 12V V_CC range
• Low quiescent current
  • 70µA supply pin
  • 50µA sense current
• SOT23-5 package
• -40°C to +125°C temperature range

Applications

• Industrial applications
• Current measurement
• Battery management
• Accurate high-side current sensing
• Over-current monitor
• Power management
• Automotive current measurement
• Motor control

For further information, including Free ZXCT1080 Samples and Datasheet, then please click here