Datasheet MAX40056F, MAX40056T, MAX40056U (Maxim)

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MAX40056F/MAX40056T/ Bidirectional Current Sense MAX40056U Amplifier with PWM-Rejection General Description Benefits and Features
The MAX40056 is a bidirectional current-sense amplifier ● Fast, 500ns PWM Edge Recovery from with an input common-mode range that extends from 500V/μs PWM Edges -0.1V to +65V together with protection against negative in- ● 60dB AC CMRR Rejection at 50V, ±500V/μs PWM ductive kickback voltages to -5V. This CSA is well-suited Edges for phase current monitoring of inductive loads, such as ● 140dB DC CMRR Rejection motors and solenoids, where pulse width modulation is ● -0.1V to +65V Input Voltage Range used to control the drive voltage and current. The ● -5V to +70V Protective Immunity MAX40056 uses an improved technique to help reject ● 300kHz, -3dB Bandwidth common-mode input PWM edges with slew rates up to ● Multiple Gain Options; 10V/V, 20V/V, 50V/V and beyond ±500V/µs. Common mode rejection ratio ● Internal, 1% Reference for Bidirectional Offset (CMRR) is typically 60dB (50V, ±500V/µs input) and ● 5μV (Typ) Input Offset Voltage 140dB DC, typical. ● Rail-to-Rail Output The MAX40056 has an internal +1.5V reference for use ● 2.02mm x 1.4mm WLP-8 and 8-pin μMAX with a nominal +3.3V power supply. The reference can al- ● -40°C to +125°C Temperature Range so be used to drive an adjoining differential ADC. The ref-
Ordering Information
appears at end of data sheet. erence is used to offset the output to indicate the direction of the input sensed current. The REF pin can source cur- rent into external loads and helps to avoid the perfor-
Typical Operating Characteristic
mance compromises resulting from routing reference volt- ages across noisy PCBs. Alternatively, for higher supply
and Simplified Block Diagram
voltages and higher full-scale output swings, the internal reference can be overridden by a higher voltage, external COMMON MODE REJECTION TO STEP INPUT (STEP INPUT RISE/ FALL TIMES AT 500V/μs) reference. toc17 VRS+=VRS- The internal or external reference can be used to define VSTEP AT the trip threshold for the integrated overcurrent compara- 10V/div RS+,RS- INPUT tor. This can provide immediate indication of an overcur- rent fault condition. The MAX40056 operates over the full -40°C to +125°C temperature range and runs from a supply voltage of VOUT 100mV/div AC +2.7V to +5.5V. It is offered in a 2.02mm x 1.4mm 8-pin COUPLED wafer-level package (WLP) and 8-pin μMAX packages. C C L L OO A A D D = = 0 0 1μs/div
Applications
● PWM H-Bridge Motor In-line/In-phase/ VDD Winding Current Sensing
MAX40056
RY RF ● Solenoid Current Sensing RS- RX RP PWM OUT ● Current Monitoring of Inductive Loads RS+ REJECT RP RX R ● Battery Stack Monitors Y RF REF ● Automotive INTERNAL 1.5V REFERENCE COP R R CIP GND 19-100394; Rev 2; 5/19 Document Outline General Description Applications Benefits and Features Typical Operating Characteristic and Simplified Block Diagram Absolute Maximum Ratings Package Information 8 µMAX 8 WLP Electrical Characteristics Typical Operating Characteristics Pin Configuration Pin Description Detailed Description Overview PWM Rejection Input Stage Low Input Offset Voltage and Low Gain Error CSA Output Voltage Reference Window Comparator and Hysteresis Applications Information Input Sense Voltage Range Choice of Reference Voltage Important Considerations Kelvin Connections Stray Inductance Typical Application Circuits Current Sensing in a 3-Phase Servo Motor Ordering Information Revision History