The RS299 are high-side, current-sense amplifiers with an input voltage range that extends from 4.5V to 76V making them ideal for telecom, backplane, and other systems where high-voltage current monitoring is critical. The RS299 allows bidirectional current sensing. The RS299 single output pin continuously monitors the transition from charge to discharge and avoids the need for a separate polarity output. The RS299 requires an external reference to set the zero current output level (VSENSE=0V). The charging current is represented by an output voltage from VREF to VCC, while discharge current is given from VREF to GND. For maximum versatility, the 76V input voltage range applies independently to both supply voltage (VCC) and common-mode input voltage (VRS+). High-side current monitoring does not interfere with the ground path of the load being measured, making the RS299 particularly useful in a wide range of high-voltage sys tems. The combination of three gain versions (20V/V, 50V/V, 60V/V, 100V/V = B, C, D, E) and a user selectable, external sense resistor sets the full-scale current reading and its proportional output voltage. The RS299 offer a high level of integration, resulting in a simple, accurate, and compact current-sense solution. The RS299 operate from a 4.5V to 76V sin gle supply and draw only 135μA of supply current. The RS299 is available in Green MSOP8 packages. It operates over an ambient temperature range of -40°C to +125°C.