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-20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers

Current-Sense Amplifiers with Input Common Range that Extends Well Below Ground (-20V)

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • Reduce Protective Clamping for High Inductive Kickback Voltage
    • -20V to +75V Input Common-Mode Voltage Range
  • Supports Wide Range of Precision AC and DC Current Sensing Applications
    • Uni- or Bidirectional Current Sensing
    • 0.6% (max) Gain Accuracy Error
    • 400µV (max) Input Offset Voltage
    • 120kHz, -3dB Bandwidth (MAX9919N)
    • Reference Input for Bidirectional OUT
    • Rail-to-Rail Output
  • Saves Board Space
    • 8-Pin SOIC Package
    • Single-Supply Operation (4.5V to 5.5V)
  • AEC-Q100 Qualified (MAX9918ASA/V+, MAX9919FASA/V+, MAX9919NASA/V+, MAX9920ASA/V+ Only)

Applications/Uses

  • Automotive
  • Current Monitoring of Inductive Loads
  • H-Bridge Motor Current Sensing
  • High- and Low-Side Precision Current Sensing
  • Precision High-Voltage Current Monitoring
  • Solenoid Current Sensing
  • Super-Capacitor Charge/Discharge Monitoring

Description

The MAX9918/MAX9919/MAX9920 are single-supply, high-accuracy current-sense amplifiers with a high input common-mode range that extends from -20V to +75V. These amplifiers are well suited for current monitoring of inductive loads such as motors and solenoids, where common-mode voltages can become negative due to inductive kickback, reverse-battery conditions, or transient events.

The MAX9918/MAX9920 feature adjustable gain set by an external resistive-divider network. The MAX9919 features fixed gains of 45V/V (MAX9919F) and 90V/V (MAX9919N). The MAX9918/MAX9919/MAX9920 operate as unidirectional amplifiers when VREFIN = GND and as bidirectional amplifiers when VREFIN = VCC/2. The MAX9920 attenuates the input signal by a factor of 4 at the input level-shifting stage allowing the device to sense voltages up to 200mV (unidirectional operation) or ±100mV (bidirectional operation).

The MAX9918/MAX9919/MAX9920 operate with a single 5V supply voltage, are fully specified over the -40°C to +125°C automotive temperature range, and are available in an 8-pin SOIC package.

Simplified Block Diagram

MAX9918, MAX9919, MAX9920: Typical Operating Circuit MAX9918, MAX9919, MAX9920: Typical Operating Circuit Zoom icon

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 .