60V High-Speed Precision Current-Sense Amplifier

Industry's Fastest Current-Sense Amplifier Also Offers Outstanding 130µV VOS Precision

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The MAX9643 is a high-speed 60V precision unidirectional current-sense amplifier ideal for a wide variety of power-supply control applications. Its high signal bandwidth allows its use within DC-DC switching converter power-supply control loops with minimal phase delay.

The IC also features 130µV (max) precision input offset voltage, allowing small sense resistors to be used in applications where efficiency is important and when wide dynamic-range current measurement is needed.

High DC CMRR and AC CMRR make it easy to use in a wide variety of aggressive environments. The device is available in fixed gains of 2.5V/V and 10V/V. It is also available in a small, 8-pin TDFN (2mm x 3mm) package and is rated over the -40°C to +125°C temperature range.
MAX9643: Typical Operating Circuit MAX9643: Typical Operating Circuit Enlarge+

Key Features

  • Supports High-Voltage Applications
    • Wide Input VCM = -1.5V to +60V
  • Delivers High-Speed Operation
    • 15MHz Bandwidth
  • Increases System Accuracy
    • Precision VOS = 130µV (max)
  • -40°C to +125°C Specified Temperature Range


  • GSM Base Station Power Supply
  • H-Bridge Motor Control
  • High-Brightness LED Control
  • Industrial Power Supplies
Product Reliability Reports: MAX9643.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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