MAX40056F

RECOMMENDED FOR NEW DESIGNS

Bidirectional Current Sense Amplifier with PWM-Rejection

Enabling Dramatic Size and Performance Improvement for In-Phase Measurement in DC Servo Drives

Data Sheet (Rev. 8)
Product Selection Table
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Overview

  • AEC-Q100
  • Fast, 500ns PWM Edge recovery from 500V/µs PWM Edges
  • 60dB AC CMRR Rejection at 50V, ±500V/µs PWM Edges
  • 140dB DC CMRR Rejection
  • -0.1V to +65V Input Voltage Range
  • -5V to +70V Protective Immunity
  • 300kHz, -3dB Bandwidth
  • Multiple Gain Options; 10V/V, 20V/V, 50V/V
  • Internal, 1% Reference for Bidirectional Offset
  • 5µV (Typ) Input Offset Voltage
  • Rail-to-Rail Output
  • 2.02mm x 1.4mm, 8-bump WLP and 8-pin µMAX
  • -40°C to +125°C Temperature Range

The MAX40056 is a bidirectional current-sense amplifier with an input common-mode range that extends from -0.1V to +65V together with protection against negative inductive kickback voltages to -5V. This CSA is well-suited for phase current monitoring of inductive loads, such as motors and solenoids, where pulse width modulation 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 ±500V/µs. Common mode rejection ratio (CMRR) is typically 60dB (50V, ±500V/µs input) and 140dB DC, typical.

The MAX40056 has an internal +1.5V reference for use with a nominal +3.3V 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 MAX40056 operates over the full -40°C to +125°C temperature range and runs from a supply voltage of +2.7V to +5.5V. It is offered in a 2.02mm x 1.4mm 8-pin wafer-level package (WLP) and 8-pin µMAX packages.

Design Solution: How Less Can Be More in Motor Control Design ›

Applications

  • Automotive
  • Battery Stack Monitors
  • Current Monitoring of Inductive Loads
  • PWM H-Bridge Motor In-line/In-phase/Winding Current Sensing
  • Solenoid Current Sensing
MAX40056F
Bidirectional Current Sense Amplifier with PWM-Rejection
MAX40056F, MAX40056T, MAX40056U: Simplified Block Diagram
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

Technical Articles 2

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Current Sense Amplifiers 1
MAX9918
PRODUCTION -20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers
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Tools & Simulations

SPICE Model 1

Evaluation Kits

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schematic 1
MAX40056EVKIT

Evaluation Kit for the MAX40056F, MAX40056T, MAX40056U

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Features and Benefits

  • Precision Real-Time Current-Monitoring with Fault Detection
  • Internal Available1.5V Reference
  • -0.3V to +65V Input Common Mode Range
  • -40°C to +125°C Temperature Range
  • Evaluates 8-µMAX MAX40056FAUA+ Device
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX40056 evaluation kit (EV kit) is a fully assembled electrical demonstration kit that provides a proven design to evaluate the MAX40056F/MAX40056T/MAX40056U high-precision, high-voltage, bidirectional current sense amplifier for PWM applications, such as servo motor control and solenoid drive. The MAX40056F/MAX40056T/ MAX40056U are ideal for 48V, or less BLDC, induction motor applications (such as robotics), pick-and-place machines, 3D prints, or other servo motor control systems.

This EV kit demonstrates the MAX40056FAUA+ in an 8-pin µMAX package, with Gain = 50V/V. For other available pin-compatible options (MAX40056TAUA+, Gain = 20V/V, MAX40056HAUA+, Gain = 10V/V), contact the factory.

Applications

  • Battery Stack Monitors
  • Current Monitoring of Inductive Loads
  • PWM H-Bridge Motor In-line/In-phase/ Winding Current Sensing
  • Solenoid Current Sensing
MAX40056EVKIT
Evaluation Kit for the MAX40056F, MAX40056T, MAX40056U
MAX40056EVKIT: Photo Board

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