MAX471

Precision, High-Side Current-Sense Amplifiers


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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.
MAX471, MAX472: Typical Operating Circuit MAX471, MAX472: Typical Operating Circuit Enlarge+

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
Product Reliability Reports: MAX471.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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