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 device suitable for closed-loop battery-charger and general-purpose current source applications. The 0 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.

Benefts and Features
● Ideal for High-Side Monitoring
   • 3V to 32V Supply Operation
   • ±0.5% Typical Full-Scale Accuracy Over Temperature
   • High Accuracy +2V to +32V Common-Mode
      Range, Functional Down to 0V, Independent of
      Supply Voltage
   • 800kHz Bandwidth [VSENSE = 100mV (1C)]
   • 200kHz Bandwidth [VSENSE = 6.25mV (C/16)]
● Minimizes Board Space Requirements
   • 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