Maxim > Products > Amplifiers > MAX471, MAX472

MAX471, MAX472

Precision, High-Side Current-Sense Amplifiers

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Status Explanations for product status codes

Part Number Status Replacement
MAX471 This product is No Longer Available. See Ordering Information for recommended replacements.MAX4070
MAX4071
MAX4072
 
MAX472 This product is No Longer Available. See Ordering Information for recommended replacements.MAX4070
MAX4071
MAX4072
 

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.

Data Sheet

Download this datasheet in PDF formatDownload Rev 2 (PDF, 136kB)
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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
   

Diagram

MAX471, MAX472: Typical Operating Circuit
Typical Operating Circuit

Notes and Comments

Precision, high-side current-sense amplifier with internal sense resistor, measures charge and discharge (MAX471)
Precision, high-side current-sense amplifier using external resistors (MAX472)

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Document Ref.: 19-0335 Rev 2; 1996-12-01
This page last modified: 2007-05-30