ACS724LMA
Automotive Grade, High-Accuracy, Hall-Effect-Based Current Sensor IC with
Common-Mode Field Rejection in High-Isolation SOIC16 Package
DESCRIPTION
FEATURES AND BENEFITS
• AEC-Q100 automotive qualified
TheAllegro™ACS724LMAcurrentsensorICisaneconomical
andprecisesolutionforACorDCcurrentsensinginautomotive,
industrial,commercial,andcommunicationsystems.Thesmall
package is ideal for space-constrained applications while also
saving costs due to reduced board area. Typical applications
includeelectricvehicleson-boardchargers, motorcontrol,load
detection and management, switched-mode power supplies,
and overcurrent fault protection.
• Differential Hall sensing rejects common-mode fields
• Patented integrated digital temperature compensation
circuitry allows for near closed loop accuracy over
temperature in an open loop sensor
• UL60950-1 (ed. 2) certification (pending)
□ Dielectric Strength Voltage = 4.8 kVRMS
□ Basic Isolation Working Voltage = 1097 VRMS
□ Reinforced Isolation Working Voltage = 565 VRMS
• Industry-leading noise performance with greatly
improved bandwidth through proprietary amplifier and
filter design techniques
• Filter pin allows user to filter output for improved
resolution at lower bandwidth
• 0.85 mΩ primary conductor resistance for low power
loss and high inrush current withstand capability
• Low-profile SOIC16 package suitable for space-
constrained applications
The device consists of a precise, low-offset, linear Hall
sensor circuit with a copper conduction path located near the
surface of the die.Applied current flowing through this copper
conduction path generates a magnetic field which is sensed
by the integrated Hall IC and converted into a proportional
voltage. The current is sensed differentially in order to reject
common-mode fields, improving accuracy in magnetically
noisyenvironments.Theinherentdeviceaccuracyisoptimized
through the close proximity of the magnetic field to the Hall
transducer. A precise, proportional voltage is provided by the
low-offset,chopper-stabilizedBiCMOSHallIC,whichincludes
Allegro’spatenteddigitaltemperaturecompensation,resulting
inextremelyaccurateperformanceovertemperature.Theoutput
of the device has a positive slope when an increasing current
flows through the primary copper conduction path (from pins
1 through 4, to pins 5 through 8), which is the path used for
current sensing. The internal resistance of this conductive path
is 0.85 mΩ typical, providing low power loss.
• 4.5 to 5.5 V single supply operation
• Output voltage proportional to AC or DC current
• Factory-trimmed sensitivity and quiescent output voltage
for improved accuracy
• Chopper stabilization results in extremely stable
quiescent output voltage
• Nearly zero magnetic hysteresis
• Ratiometric output from supply voltage
PACKAGE: 16-pin SOICW (suffix MA)
The terminals of the conductive path are electrically isolated
from the sensor leads (pins 9 through 16). This allows the
ACS724LMAcurrent sensor IC to be used in high-side current
sense applications without the use of high-side differential
amplifiers or other costly isolation techniques.
Not to scale
Continued on the next page…
16
ACS724LMA NC
1
2
3
The ACS724LMA outputs an
IP+
IP+
IP+
IP+
15
analog signal, VIOUT, that
changes proportionally with
GND
NC
+IP
14
4
the bidirectional AC or DC
primary sensed current, IP,
within the specified measure-
ment range.
13
12
11
10
9
FILTER
IP
VIOUT
NC
CF
5
6
7
CL
1 nF
IP–
IP–
IP–
IP–
The FILTER pin can be used
to decrease the bandwidth in
order to optimize the noise
performance.
–IP
VCC
NC
8
CBYPASS
0.1 µF
Typical Application
ACS724LMA-DS, Rev. 6
MCO-0000322
March 9, 2018