Simplified Block Diagram
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- Real-Time Current Monitoring
- Wide 4.5V to 76V Input Common-Mode Range Independent of Operating Supply Voltage
- Bidirectional or Unidirectional ISENSE
- ±0.1% Full-Scale Accuracy
- 8-Pin µMAX Package
- Fully Assembled and Tested
- 48V Telecom and Backplane Current Measurement
- Automotive (12V, 24V, or 42V Batteries)
- Avalanche Photodiode and PIN-Diode Current Monitoring
- Bidirectional Motor Control
- General System/Board-Level Current Sensing
- Power-Management Systems
- Precision High-Voltage Current Sources
The EV kit can also be used to evaluate the MAX4081, which is a bidirectional version of the current-sense amplifier. The MAX4081's single output pin continuously monitors the transition from charge to discharge and avoids the need for a separate polarity output pin. The MAX4081 requires an external reference to set the zerocurrent output level (VSENSE = 0V). Charging current is represented by an output voltage from VREF to VCC, while discharge current is given from VREF to GND.
All gain versions of the MAX4080 and MAX4081 are footprint-compatible and the MAX4080SAUA can easily be replaced by a MAX4080FAUA, MAX4080TAUA, MAX4081FAUA, MAX4081TAUA, or MAX4081SAUA. With a combination of three gain versions (5V/V, 20V/V, 60V/V = F, T, S suffix) and a user-selectable, external sense resistor, the user can easily match the full-scale load current to the required output-voltage range.
For maximum versatility, these parts can operate with 76V input common-mode voltage at RS+ and RS- pins, independent of operating supply voltage (VCC) used. These parts also allow a large differential voltage between RS+ and RS- pins for high reliability. High-side current monitoring does not interfere with the ground path of the load being measured, making the MAX4080/MAX4081 particularly useful in a wide range of high-voltage systems.