MAX40056FAUA+ Bidirectional Current Sense Amplifier with PWM-Rejection

Maxim’s current sense amplifier is well-suited for phase current monitoring of inductive loads such as motors and solenoids

Image of Maxim's MAX40056FAUA+ Bidirectional Current Sense Amplifier with PWM-RejectionMaxim’s MAX40056FAUA+ is a bidirectional current-sense amplifier with an input common-mode range that extends from -0.1 V to +65 V with protection against negative inductive kickback voltages to -5 V. This current sense amplifier is well-suited for phase current monitoring of inductive loads, such as motors and solenoids, where pulse width modulation (PWM) is used to control the drive voltage and current. The MAX40056 uses an improved technique to help reject common-mode input PWM edges with slew rates up to and beyond ±500 V/µs. Common mode rejection ratio (CMRR) is typically 60 dB (50 V, ±500 V/µs input) and 140 dB DC, typical.

The MAX40056FAUA+ has an internal +1.5 V reference for use with a nominal +3.3 V power supply. The reference can also be used to drive an adjoining differential ADC. The reference is used to offset the output to indicate the direction of the input sensed current. The REF pin can source current into external loads and helps to avoid the performance compromises resulting from routing reference voltages across noisy PCBs. Alternatively, for higher supply voltages and higher full-scale output swings, the internal reference can be overridden by a higher voltage, external reference.

The internal or external reference can be used to define the trip threshold for the integrated overcurrent comparator. This can provide immediate indication of an overcurrent fault condition.

The MAX40056FAUA+ operates over the full -40°C to +125°C temperature range and runs from a supply voltage of +2.7 V to +5.5 V.

Features
  • Fast 2 µs PWM edge recovery (1%) from 500 V/µs PWM edges
  • 60 dB AC CMRR rejection at 50 V, ±500 V/µs PWM edges
  • 140 dB DC CMRR rejection
  • -0.1 V to +65 V input voltage range
  • -5 V to +70 V protective immunity
  • 300 kHz, -3 dB bandwidth
  • Multiple gain options; 10 V/V, 20 V/V, 50 V/V
  • Internal 1% reference for bidirectional offset
  • 5 µV (typ) input offset voltage
  • Rail-to-rail output
  • 2.02 mm x 1.4 mm WLP-8 and 8-pin µMAX
  • -40°C to +125°C temperature range
Applications
  • Automotive
  • Battery stack monitors
  • Current monitoring of inductive loads
  • PWM H-bridge motor in-line/in-phase/winding current sensing
  • Solenoid current sensing

MAX40056FAUA+ Bidirectional Current Sense Amplifier with PWM-Rejection

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC CURR SENSE 1 CIRCUIT 8UMAXMAX40056FAUA+IC CURR SENSE 1 CIRCUIT 8UMAX1566 - Immediate
1100 - Factory Stock
View Details

Evaluation Board

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
EVAL MAX40056 AMP CURRENT SENSEMAX40056EVKIT#EVAL MAX40056 AMP CURRENT SENSE1 - Immediate
8 - Factory Stock
View Details

MAX4080 Associated Parts

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC CURR SENSE 1 CIRCUIT 8SOICMAX4080FASA+IC CURR SENSE 1 CIRCUIT 8SOIC1408 - ImmediateView Details
IC CURR SENSE 1 CIRCUIT 8SOICMAX4080FASA+TIC CURR SENSE 1 CIRCUIT 8SOIC2215 - ImmediateView Details

MAX4372 Associated Parts

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC CURR SENSE 1 CIRCUIT 5UCSPMAX4372FEBT+TIC CURR SENSE 1 CIRCUIT 5UCSP20 - Immediate
45000 - Factory Stock
View Details
IC CURR SENSE 1 CIRCUIT 8SOICMAX4372FESA+IC CURR SENSE 1 CIRCUIT 8SOIC383 - Immediate
63900 - Factory Stock
View Details

MAX4373 Associated Parts

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC AMP COMP REF 8UMAXMAX4373FEUA+TIC AMP COMP REF 8UMAX0View Details
IC AMP COMP REF 8SOICMAX4373TESA+TIC AMP COMP REF 8SOIC3403 - ImmediateView Details

MAX44284 Associated Parts

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC CURR SENSE 1 CIRCUIT 6WLPMAX44284EAWT+TIC CURR SENSE 1 CIRCUIT 6WLP3187 - ImmediateView Details
IC CURR SENSE 1 CIRCUIT SOT23-6MAX44284FAUT+TIC CURR SENSE 1 CIRCUIT SOT23-66616 - ImmediateView Details

MAX9918 Associated Parts

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC CURR SENSE 1 CIRCUIT 8SOICMAX9918ASA+IC CURR SENSE 1 CIRCUIT 8SOIC583 - ImmediateView Details
IC CURR SENSE 1 CIRCUIT 8SOICMAX9918ASA+TIC CURR SENSE 1 CIRCUIT 8SOIC3803 - ImmediateView Details

MAX9938 Associated Parts

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC CURR SENSE 1 CIRCUIT 6UDFNMAX9938FELT+TIC CURR SENSE 1 CIRCUIT 6UDFN1805 - ImmediateView Details
IC CURR SENSE 1 CIRCUIT SOT23-5MAX9938FEUK+TIC CURR SENSE 1 CIRCUIT SOT23-50View Details
Published: 2019-03-29