ACS723
High-Accuracy, Galvanically Isolated Current Sensor IC
with Small Footprint SOIC8 Package
FEATURES AND BENEFITS DESCRIPTION
Patented integrated digital temperature compensation The Allegro ACS723 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
costs due to reduced board area. Typical applications include
Dielectric Strength Voltage = 2.4 kVrms
motor control, load detection and management, switched-mode
Basic Isolation Working Voltage = 420 Vpk / 297 Vrms
power supplies, and overcurrent fault protection.
Industry-leading noise performance with greatly
improved bandwidth through proprietary amplifier and
The device consists of a precise, low-offset, linear Hall
filter design techniques
sensor circuit with a copper conduction path located near the
Pin-selectable bandwidth: 80 kHz for high bandwidth
surface of the die. Applied current flowing through this copper
applications or 20 kHz for low-noise performance
conduction path generates a magnetic field which is sensed by
0.65 m primary conductor resistance for low power
the integrated Hall IC and converted into a proportional voltage.
loss and high inrush current withstand capability
Device accuracy is optimized through the close proximity of the
Small footprint, low-profile SOIC8 package suitable for
magnetic field to the Hall transducer. A precise, proportional
space-constrained applications
voltage is provided by the low-offset, chopper-stabilized
Integrated shield virtually eliminates capacitive BiCMOS Hall IC, which includes Allegros patented digital
coupling from current conductor to die, greatly
temperature compensation, resulting in extremely accurate
suppressing output noise due to high dv/dt transients
performance over temperature. The output of the device has
4.5 to 5.5 V, single supply operation
a positive slope when an increasing current flows through the
primary copper conduction path (from pins 1 and 2, to pins 3
Output voltage proportional to AC or DC current
and 4), which is the path used for current sensing. The internal
Factory-trimmed sensitivity and quiescent output voltage
resistance of this conductive path is 0.65 m typical, providing
for improved accuracy
low power loss.
Continued on the next page
The terminals of the conductive path are electrically isolated
from the sensor leads (pins 5 through 8). This allows the
TV America
UL Certified File
Certificate Number:
ACS723 current sensor IC to be used in high-side current sense
No.: US-32848-UL
U8V 18 02 54214 041
CB 14 11 54214 031
applications without the use of high-side differential amplifiers
or other costly isolation techniques.
PACKAGE: 8-pin SOIC (suffix LC)
Continued on the next page
Not to scale
The ACS723 outputs an
8
1
analog signal, V , that
IOUT
IP+ VCC
changes, proportionally,
+I
P
ACS723
with the bidirectional AC or
7
2
DC primary sensed current,
IP+ VIOUT
I , within the specified
P
I measurement range. The
C
P BYPASS
BW_SEL pin can be used
6 0.1 F
3
BW_SEL
IP to select one of the two
I
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
ACS723-DS, Rev. 6 September 3, 2019
MCO-0000538High-Accuracy, Galvanically Isolated Current Sensor IC
ACS723
with Small Footprint SOIC8 Package
FEATURES AND BENEFITS (continued) DESCRIPTION (continued)
Chopper stabilization results in extremely stable quiescent The ACS723 is provided in a small, low-profile surface-mount
output voltage
SOIC8 package. The leadframe is plated with 100% matte tin,
Nearly zero magnetic hysteresis which is compatible with standard lead (Pb) free printed circuit
board assembly processes. Internally, the device is Pb-free, except
Ratiometric output from supply voltage
for flip-chip high-temperature Pb-based solder balls, currently
exempt from RoHS. The device is fully calibrated prior to shipment
from the factory.
SELECTION GUIDE
Sens(Typ)
I T
PR A
[1]
Part Number at V = 5 V Packing
CC
(A) (C)
(mV/A)
[2]
ACS723LLCTR-05AB-T 5
400
[2]
ACS723LLCTR-10AU-T 10
[2]
ACS723LLCTR-10AB-T 10
200
[2]
ACS723LLCTR-20AU-T 20
40 to 150 Tape and Reel, 3000 pieces per reel
[2]
ACS723LLCTR-20AB-T 20
100
[2]
ACS723LLCTR-40AU-T 40
[2]
ACS723LLCTR-40AB-T 40 50
[2]
ACS723LLCTR-50AB-T 50 40
[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