Click here to ask about the production status of specific part numbers. MAX40056F/MAX40056T/ Bidirectional Current Sense MAX40056U Amplifier with PWM-Rejection General Description Benefits and Features The MAX40056 is a bidirectional current-sense amplifier AEC-Q100 with an input common-mode range that extends from Fast, 500ns PWM Edge Recovery from 500V/s PWM -0.1V to +65V together with protection against negative in- Edges ductive kickback voltages to -5V. This CSA is well-suited 60dB AC CMRR Rejection at 50V, 500V/s PWM for phase current monitoring of inductive loads, such as Edges motors and solenoids, where pulse width modulation is 140dB DC CMRR Rejection used to control the drive voltage and current. The -0.1V to +65V Input Voltage Range MAX40056 uses an improved technique to help reject -5V to +70V Protective Immunity common-mode input PWM edges with slew rates up to 300kHz, -3dB Bandwidth and beyond 500V/s. Common mode rejection ratio Multiple Gain Options 10V/V, 20V/V, 50V/V (CMRR) is typically 60dB (50V, 500V/s input) and Internal, 1% Reference for Bidirectional Offset 140dB DC, typical. 5V (Typ) Input Offset Voltage Rail-to-Rail Output The MAX40056 has an internal +1.5V reference for use 2.02mm x 1.4mm, 8-bump WLP and 8-pin MAX with a nominal +3.3V power supply. The reference can al- -40C to +125C Temperature Range so be used to drive an adjoining differential ADC. The ref- erence is used to offset the output to indicate the direc- Ordering Information appears at end of data sheet. tion of the input sensed current. The REF pin can source current into external loads and helps to avoid the perfor- mance compromises resulting from routing reference volt- ages 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 compara- tor. This can provide immediate indication of an overcur- rent fault condition. The MAX40056 operates over the full -40C to +125C 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 MAX packages. Applications PWM H-Bridge Motor In-line/In-phase/Winding Current Sensing Solenoid Current Sensing Current Monitoring of Inductive Loads Battery Stack Monitors Automotive 19-100394 Rev 8 2/21MAX40056F/MAX40056T/ Bidirectional Current Sense MAX40056U Amplifier with PWM-Rejection Typical Operating Characteristic and Simplified Block Diagram CCOOMMMMOONN MMOODDEE RREEJJEECCTTIIOONN TTOO SSTTEEPP IINNPPUUTT ((SSTTEEPP IINNPPUUTT RRIISSEE// FFAALLLL TTIIMMEESS AATT 550000VV//ss)) toc17 V =V RS+ RS- V STEP AT 10V/div RS+,RS- INPUT V 100mV/div OUT AC COUPLED CLCOLAODA D= 0= 0 1s/div V DD MAX40056 RY RF RX RP RS- PWM OUT REJECT RP RS+ RX R Y R F REF INTERNAL 1.5V REFERENCE COP R R CIP GND www.maximintegrated.com Maxim Integrated 2