ACS725KMA
High-Accuracy, Hall-Effect-Based Current Sensor IC with
Common-Mode Field Rejection in High-Isolation SOIC16 Package
DESCRIPTION
FEATURES AND BENEFITS
• 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
TheAllegro™ACS725KMAcurrentsensorICisaneconomical
andprecisesolutionforACorDCcurrentsensinginindustrial,
commercial, and communication systems. The small package
is ideal for space-constrained applications while also saving
costs due to reduced board area. Typical applications include
motorcontrol,loaddetectionandmanagement,switched-mode
power supplies, and overcurrent fault protection.
• UL60950-1 (ed. 2) certified
□ 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.
• 3 to 3.6 V single supply operation
• Output voltage proportional to AC or DC current
Continued on the next page…
TÜV America
Certificate Number:
U8V 14 11 54214 030
CB 14 11 54214 029
CB Certificate Number:
US-22339-A1-UL
The terminals of the conductive path are electrically isolated
from the sensor leads (pins 9 through 16). This allows the
ACS725KMAcurrentsensorICtobeusedinhigh-sidecurrent
Package: 16-pin SOICW (suffix MA)
Continued on the next page…
Not to scale
16
ACS725KMA NC
1
2
3
The ACS725KMA outputs
IP+
IP+
IP+
IP+
15
an 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
ACS725KMA-DS, Rev. 5
MCO-0000218
January 22, 2018