Bidirectional, High-Side, Current-Sense Amplifiers with Reference

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The MAX4069–MAX4072 low-cost, bidirectional, high-side, current-sense amplifiers are ideal for monitoring battery charge and discharge currents in notebooks, cell phones, and other portable equipment. They feature up to 24V input common-mode voltage range, low 100µA supply current (which drops to only 10µA in shutdown), and a total output error of less than 1.5%. The wide 1.35V to 24V input common-mode range is independent of the supply voltage, ensuring that the current-sense feedback remains accurate even when connected to a battery pack in deep discharge.

To achieve maximum flexibility, an external current-sense resistor is used along with a Gain Select pin to choose either 50V/V or 100V/V. A single output pin continuously monitors the transition from charge to discharge and avoids the need for a separate polarity output. The MAX4070 contains an internal 2.5V reference. The charging current is represented by an output voltage from 2.5V to VCC, while discharge current is given from 2.5V to GND. The MAX4071 is similar, but with a reference voltage of 1.5V. The MAX4069 has an adjustable reference voltage, set by two external resistors. The MAX4072 has an input for an external reference.

The MAX4069/MAX4071/MAX4072 operate from a 2.7V to 24V single supply. The MAX4070 operates from a 3.6V to 24V single supply. All devices are specified over the automotive operating temperature range, -40°C to +125°C. The MAX4070/MAX4071/MAX4072 are available in 8-pin µMAX® and 8-pin thin QFN packages. The MAX4069 is available in a 10-pin µMAX package.
MAX4069, MAX4070, MAX4071, MAX4072: Typical Operating Circuit MAX4069, MAX4070, MAX4071, MAX4072: Typical Operating Circuit Enlarge+

Key Features

  • Bidirectional, Compact, Current-Sense Solution
  • Total Output Error Less than 1.5%
  • Selectable Gain of 50V/V or 100V/V
  • Wide 1.35V to 24V Common-Mode Range Independent of Supply Voltage
  • 2.7V to 24V Single-Supply Operation
  • Internal Precision Reference
    • Adjustable (MAX4069)
    • 2.50V (MAX4070)
    • 1.50V (MAX4071)
  • Low 100µA Supply Current
  • 10µA Supply Current in Shutdown
  • Available in Space-Saving Packages
    • 8-Pin Thin QFN (MAX4070/MAX4071/MAX4072)
    • 8-Pin µMAX (MAX4070/MAX4071MAX4072)
    • 10-Pin µMAX (MAX4069)


  • Cell Phone Battery-Current Monitoring
  • Motor Control
  • Notebook Fuel Gauging
  • Power-Management Systems
  • Smart Battery Packs/Chargers

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX4069.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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