Top

Precision, High-Side Current-Sense Amplifiers

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Key Features

  • Complete High-Side Current Sensing
  • Precision Internal Sense Resistor (MAX471)
  • 2% Accuracy Over Temperature
  • Monitors Both Charge and Discharge
  • 3A Sense Capability with Internal Sense Resistor (MAX471)
  • Higher Current-Sense Capability with External Sense Resistor (MAX472)
  • 100µA Max Supply Current
  • 18µA Max Shutdown Mode
  • 3V to 36V Supply Operation
  • 8-Pin DIP/SO Packages

Applications/Uses

  • Battery-Powered Applications
  • Cell Phones
  • Energy Management
  • Portable PCs: Notebooks, Subnotebooks, Palmtops
  • Portable Phones
  • Portable Test/Measurement Systems
  • Smart Battery Packs/Chargers

Description

The MAX471/MAX472 are complete, bidirectional, high-side current-sense amplifiers 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 ground paths of the battery chargers or monitors often found in "smart" batteries.

The MAX471 has an internal 35mΩ current-sense resistor and measures battery currents up to ±3A. For applications requiring higher current or increased flexibility, the MAX472 functions with external sense and gain-setting resistors. Both devices have a current output that can be converted to a ground-referred voltage with a single resistor, allowing a wide range of battery voltages and currents.

An open-collector SIGN output indicates current-flow direction, so the user can monitor whether a battery is being charged or discharged. Both devices operate from 3V to 36V, draw less than 100µA over temperature, and include a 18µA max shutdown mode.

Simplified Block Diagram

MAX471, MAX472: Typical Operating Circuit MAX471, MAX472: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .