General Description
The MAX4172 is a low-cost, precision, high-side current sense amplifier for portable PCs, telephones, and other systems where battery/DC power-line monitoring is critical. High-side power-line monitoring is especially useful in battery-powered systems, since it does not interfere with the battery charger’s ground path. Wide bandwidth and ground-sensing capability make the MAX4172 suitable for closed-loop battery-charger and general purpose current-source applications. The 0V to 32V input common-mode range is independent of the supply voltage, which ensures that current-sense feedback remains viable, even when connected to a battery in deep discharge.

FEATUREs
♦ Low-Cost, High-Side Current-Sense Amplifier
♦ ±0.5% Typical Full-Scale Accuracy Over
   Temperature
♦ 3V to 32V Supply Operation
♦ 0V to 32V Input Range—Independent of
   Supply Voltage
♦ 800kHz Bandwidth [VSENSE = 100mV (1C)]
   200kHz Bandwidth [VSENSE = 6.25mV (C/16)]
♦ Available in Space-Saving µMAX and SO
   Packages

APPLICATIONs
   Portable PCs: Notebooks/Subnotebooks/Palmtops
   Battery-Powered/Portable Equipment
   Closed-Loop Battery Chargers/Current Sources
   Smart-Battery Packs
   Portable/Cellular Phones
   Portable Test/Measurement Systems
   Energy Management Systems