MAX9934FAUA+ (MAXIM INTEGRATED PRODUCTS)

The MAX9934FAUA+ is a high precision, low voltage, current-sense amplifier with current output and chip select for multiplexing in 8 pin µMAX package. It is ideal for both bidirectional (charge/discharge) and unidirectional current measurements in battery-powered portable and laptop devices. Its precision input specification allows the use of very small sense voltages (typically ±10mV full-scale) for minimally invasive current sensing. The output of the MAX9934 is a current proportional to input VSENSE and is available in 5µA/mV gain with gain accuracy better than 0.25% (max) at +25°C. A chip select (CS) allows multiplexing of several MAX9934 current outputs to a single microcontroller ADC channel. CS is compatible with 1.8V and 3.3V logic systems. When powered down (VCC = 0), RS+ and RS- draw less than 0.1nA (typ) leakage current to reduce battery load. The MAX9934 is robust and protected from input faults of up to ±6V input differential voltage between RS+ and RS-.