MAX4172

PRODUCTION

Low-Cost, Precision, High-Side Current-Sense Amplifier

Low-cost, Precision Current Monitoring For Portable Battery-Powered Applications

Data Sheet (Rev. 5) Product Selection Table
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Overview

  • 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.

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
MAX4172
Low-Cost, Precision, High-Side Current-Sense Amplifier
MAX4172: Functional Diagram
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 5

Technical Articles 9

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Current Sense Amplifiers 6
MAX4071
PRODUCTION Bidirectional, High-Side, Current-Sense Amplifiers with Reference
MAX4070
PRODUCTION Bidirectional, High-Side, Current-Sense Amplifiers with Reference
MAX4173
PRODUCTION Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier
MAX4372
RECOMMENDED FOR NEW DESIGNS Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output
MAX4373
PRODUCTION Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs
MAX4375
PRODUCTION Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs
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Tools & Simulations

SPICE Model 1

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