Features and Benefits
- 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
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 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 MAX4172 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 MAX4172 operates with a 3.0V to 32V supply voltage, and is available in a space-saving, 8-pin µMAX® or SO package.
- 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
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
MAX4172 Reliability Data1/12/2023118K
Derive Simple High-Current Source from Lab Supply8/3/2010
High-Side Current-Sense Amplifier Operates at High Voltage8/17/2006
High-Side Positive Current Sensor Monitors Negative Supply6/20/2003
Overload Circuitry Protects Batteries and Power Supplies1/31/2001
Circuit Breaker Handles Voltages to 76V7/28/2000
Overcurrent Monitor Operates up to 26V3/20/2023
Optocoupler Extends High-Side Current Sensor to 1kV2/15/2023
DC Error Budget Calculator Simplifies Selection of Optimal Current-Sense Amplifiers4/9/2013
Performance of Current-Sense Amplifiers with Input Series Resistors1/3/2007
Creating a Bidirectional Current-Sense Amplifier from Two Unidirectional Current-Sense Amplifiers9/22/2006
Moving-Coil Meter Measures Low-Level Currents6/20/2005
High-Side Current-Sense Measurement: Circuits and Principles11/19/2001
Wireless-Modem Power for Hand-Held Devices8/1/2000
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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