EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX40056F/MAX40056T/
MAX40056U Bidirectional Current Sense
Amplifier with PWM-Rejection General Description Benefits and Features 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. ● Fast, 500ns PWM Edge Recovery from 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
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