MAX9918-20 Family Current Sense Amplifiers

Maxim's current sense amplifiers feature a large input range that extends below ground

Image of Maxim Integrated MAX9918-20 Family Current Sense Amplifiers (click to enlarge)Maxim’s MAX9918-20 family are current-sense amplifiers which offer single-supply and high accuracy with a high input common-mode range that extends from -20 V to +75 V. This family is 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 and MAX9920 feature adjustable gain set by an external resistive-divider network. The MAX9919 features fixed gains of 45 V/V (MAX9919F) and 90 V/V (MAX9919N). They all 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 200 mV (unidirectional operation) or ±100 mV (bidirectional operation).

The MAX9918-20 family operates with a single 5 V supply voltage and are fully specified over the -40°C to +125°C automotive temperature range.

Applications Features
  • 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
  • Reduce protective clamping for high inductive kickback voltage
  • Supports wide range of precision AC and DC current sensing applications
  • Saves board space
    • 8-pin SOIC package
    • Single-supply operation (4.5 V to 5.5 V)

MAX9918-20 Family Current Sense Amplifiers

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC OPAMP CURR SENSE 230KHZ 8SOICMAX9920ASA+IC OPAMP CURR SENSE 230KHZ 8SOIC948 - ImmediateView Details
IC OPAMP CURR SENSE 120KHZ 8SOICMAX9919NASA+IC OPAMP CURR SENSE 120KHZ 8SOIC851 - ImmediateView Details
IC OPAMP CURR SENSE 250KHZ 8SOICMAX9919FASA+IC OPAMP CURR SENSE 250KHZ 8SOIC3070 - Immediate
1500 - Factory Stock
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IC OPAMP CURR SENSE 120KHZ 8SOICMAX9919NASA+TIC OPAMP CURR SENSE 120KHZ 8SOIC2844 - Immediate
7500 - Factory Stock
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IC OPAMP CURR SENSE 250KHZ 8SOICMAX9919FASA+TIC OPAMP CURR SENSE 250KHZ 8SOIC3214 - Immediate
2500 - Factory Stock
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EVAL KIT FOR MAX9918MAX9918EVKIT+EVAL KIT FOR MAX99184 - Immediate
7 - Factory Stock
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Published: 2018-01-23