The MAX4172ESA 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 MAX4172ESA 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.
To provide a high level of flexibility, the MAX4172ESA functions with an external sense resistor to set the range of load current to be monitored. It has a current output that can be converted to a ground-referred voltage with a single resistor, accommodating a wide range of battery voltages and currents.
An open-collector power-good output (active-low PG) indicates when the supply voltage reaches an adequate level to guarantee proper operation of the current-sense amplifier. The MAX4172ESA operates with a 3.0V to 32V supply voltage, and is available in a space-saving, 8-pin μMAX or SO package.
Feature
- 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
- Battery-Powered Applications
- Closed-Loop Battery Chargers/Current Sources
- Energy Management
- Portable PCs: Notebooks, Subnotebooks, Palmtops
- Portable Test/Measurement Systems
- Portable/Cellular Phones
- Smart Battery Packs/Chargers
