ACS722
High Accuracy, Galvanically Isolated Current Sensor IC
with Small Footprint SOIC8 Package
FEATURES AND BENEFITS DESCRIPTION
Patented integrated digital temperature compensation The Allegro ACS722 current sensor IC is an economical and
circuitry allows for near closed loop accuracy over precise solution for AC or DC current sensing in industrial,
temperature in an open loop sensor commercial, and communications systems. The small package
UL60950-1 (ed. 2) certified is ideal for space constrained applications while also saving
Dielectric Strength Voltage = 2.4 kVrms costs due to reduced board area. Typical applications include
Basic Isolation Working Voltage = 420 Vpk/297 motor control, load detection and management, switched-mode
Vrms power supplies, and overcurrent fault protection.
Industry-leading noise performance with greatly
The device consists of a precise, low-offset, linear Hall
improved bandwidth through proprietary amplifier and
sensor circuit with a copper conduction path located near the
filter design techniques
surface of the die. Applied current flowing through this copper
Pin-selectable band width: 80 kHz for high bandwidth
conduction path generates a magnetic field which is sensed by
applications or 20 kHz for low noise performance
the integrated Hall IC and converted into a proportional voltage.
0.65 m primary conductor resistance for low power
Device accuracy is optimized through the close proximity of the
loss and high inrush current withstand capability
magnetic field to the Hall transducer. A precise, proportional
Small footprint, low-profile SOIC8 package suitable for
voltage is provided by the low-offset, chopper-stabilized
space-constrained applications
BiCMOS Hall IC, which includes Allegros patented digital
Integrated shield virtually eliminates capacitive coupling
temperature compensation, resulting in extremely accurate
from current conductor to die, greatly suppressing output
performance over temperature. The output of the device has
noise due to high dv/dt transients
a positive slope when an increasing current flows through the
3 to 3.6 V, single supply operation
primary copper conduction path (from pins 1 and 2, to pins 3
Continued on the next page
and 4), which is the path used for current sensing. The internal
resistance of this conductive path is 0.65 m typical, providing
TV America
low power loss.
UL Certified File
Certificate Number:
No.: US-32848-UL
U8V 18 02 54214 041
The terminals of the conductive path are electrically isolated
CB 14 11 54214 031
from the sensor leads (pins 5 through 8). This allows the
Package: 8-pin SOIC (suffix LC)
ACS722 current sensor IC to be used in high-side current sense
applications without the use of high-side differential amplifiers
or other costly isolation techniques.
The ACS722 is provided in a small, low profile surface mount
SOIC8 package. The leadframe is plated with 100% matte tin,
Continued on the next page
Not to scale
8
1
The ACS722 outputs an analog
IP+ VCC
signal, V , that changes,
+I IOUT
P
ACS722
proportionally, with the
7
2
bidirectional AC or DC primary
IP+ VIOUT
sensed current, I , within
P
the specified measurement
I C
P BYPASS
range. The BW_SEL pin can
6 0.1 F
3
BW_SEL
IP
be used to select one of the
I
two bandwidths to optimize the
P
C
L
noise performance. Grounding
4 5
the BW_SEL pin puts the part
GND
IP
in the high bandwidth (80 kHz)
mode.
Typical Application
ACS722-DS, Rev. 4
June 3, 2019
MCO-0000537High Accuracy, Galvanically Isolated Current Sensor IC
ACS722
with Small Footprint SOIC8 Package
Features and Benefits (continued) Description (continued)
Output voltage proportional to AC or DC current which is compatible with standard lead (Pb) free printed circuit
Factory-trimmed sensitivity and quiescent output voltage for board assembly processes. Internally, the device is Pb-free, except
improved accuracy for flip-chip high-temperature Pb-based solder balls, currently
Chopper stabilization results in extremely stable quiescent exempt from RoHS. The device is fully calibrated prior to shipment
output voltage from the factory.
Nearly zero magnetic hysteresis
Ratiometric output from supply voltage
Selection Guide
Sens(Typ)
1
Part Number I (A) at V = 3.3 V T (C) Packing
PR CC A
(mV/A)
2
ACS722LLCTR-05AB-T 5
264
2
ACS722LLCTR-10AU-T 10
2
ACS722LLCTR-10AB-T 10
132
2
ACS722LLCTR-20AU-T 20 -40 to 150 Tape and Reel, 3000 pieces per reel
2
ACS722LLCTR-20AB-T 20
66
2
ACS722LLCTR-40AU-T 40
2
ACS722LLCTR-40AB-T 40 33
1
Contact Allegro for additional packing options.
2
Variant not intended for automotive applications.
2
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com