ACS723
High-Accuracy, Galvanically Isolated Current Sensor IC
with Small Footprint SOIC8 Package
• Patented integrated digital temperature compensation
circuitry allows for near closed loop accuracy over
temperature in an open loop sensor
• UL60950-1 (ed. 2) certified
□
Dielectric Strength Voltage = 2.4 kVrms
□
Basic Isolation Working Voltage = 420 Vpk / 297 Vrms
• Industry-leading noise performance with greatly
improved bandwidth through proprietary amplifier and
filter design techniques
• Pin-selectable bandwidth: 80 kHz for high bandwidth
applications or 20 kHz for low-noise performance
•
0.65 mΩ primary conductor resistance for low power
loss and high inrush current withstand capability
• Small footprint, low-profile SOIC8 package suitable for
space-constrained applications
• Integrated shield virtually eliminates capacitive
coupling from current conductor to die, greatly
suppressing output noise due to high dv/dt transients
• 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
Continued on the next page…
TÜV America
Certificate Number:
U8V 18 02 54214 041
CB 14 11 54214 031
UL Certified File
No.: US-32848-UL
FEATURES AND BENEFITS
The Allegro
™
ACS723 current sensor IC is an economical and
precise solution for AC or DC current sensing in industrial,
commercial, and communications systems. The small package
is ideal for space constrained applications while also saving
costs due to reduced board area. Typical applications include
motor control, load detection and management, switched-mode
power supplies, and overcurrent fault protection.
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.
Device accuracy is optimized through the close proximity of the
magnetic field to the Hall transducer. A precise, proportional
voltage is provided by the low-offset, chopper-stabilized
BiCMOS Hall IC, which includes Allegro’s patented digital
temperature compensation, resulting in extremely accurate
performance over temperature. The output of the device has
a positive slope when an increasing current flows through the
primary copper conduction path (from pins 1 and 2, to pins 3
and 4), which is the path used for current sensing. The internal
resistance of this conductive path is 0.65 mΩ typical, providing
low power loss.
The terminals of the conductive path are electrically isolated
from the sensor leads (pins 5 through 8). This allows the
ACS723 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.
Continued on the next page…
DESCRIPTION
PACKAGE:
8-pin SOIC (suff ix LC)
Not to scale
The ACS723 outputs an
analog signal, V
IOUT
, that
changes, proportionally,
with the bidirectional AC or
DC primary sensed current,
I
P
, within the specified
measurement range. The
BW_SEL pin can be used
to select one of the two
bandwidths to optimize the
noise performance. Grounding
the BW_SEL pin puts the part
in the high bandwidth, 80 kHz,
mode.
1
+I
P
2
I
P
8
IP+
VCC
ACS723
7
IP+
VIOUT
6
C
L
4
IP–
GND
5
C
BYPASS
0.1 µF
3
–I
P
IP–
BW_SEL
Typical Application
ACS723-DS, Rev. 6
MCO-0000538
September 3, 2019
ACS723
High-Accuracy, Galvanically Isolated Current Sensor IC
with Small Footprint SOIC8 Package
DESCRIPTION
(continued)
The ACS723 is provided in a small, low-profile surface-mount
SOIC8 package. The leadframe is plated with 100% matte tin,
which is compatible with standard lead (Pb) free printed circuit
board assembly processes. Internally, the device is Pb-free, except
for flip-chip high-temperature Pb-based solder balls, currently
exempt from RoHS. The device is fully calibrated prior to shipment
from the factory.
FEATURES AND BENEFITS
(continued)
• Chopper stabilization results in extremely stable quiescent
output voltage
• Nearly zero magnetic hysteresis
• Ratiometric output from supply voltage
SELECTION GUIDE
Part Number
ACS723LLCTR-05AB-T
[2]
ACS723LLCTR-10AU-T
[2]
ACS723LLCTR-10AB-T
[2]
ACS723LLCTR-20AU-T
[2]
ACS723LLCTR-20AB-T
[2]
ACS723LLCTR-40AU-T
[2]
ACS723LLCTR-40AB-T
[2]
ACS723LLCTR-50AB-T
[2]
[1]
Contact Allegro
[2]
Variant
I
PR
(A)
±5
10
±10
20
±20
40
±40
±50
Sens(Typ)
at V
CC
= 5 V
(mV/A)
400
200
T
A
(°C)
Packing
[1]
–40 to 150
100
50
40
Tape and Reel, 3000 pieces per reel
for additional packing options.
not intended for automotive applications.
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
2
ACS723
High-Accuracy, Galvanically Isolated Current Sensor IC
with Small Footprint SOIC8 Package
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Voltage
Reverse Output Voltage
Maximum Continuous Current
Operating Ambient Temperature
Junction Temperature
Storage Temperature
Symbol
V
CC
V
RCC
V
IOUT
V
RIOUT
I
CMAX
T
A
T
J(max)
T
stg
T
A
= 25°C
Range L
Notes
Rating
6
–0.1
25
–0.1
65
–40 to 150
165
–65 to 165
Units
V
V
V
V
A
°C
°C
°C
ISOLATION CHARACTERISTICS
Characteristic
Dielectric Strength Test Voltage
Symbol
V
ISO
Notes
Agency type-tested for 60 seconds per UL 60950-1
(edition. 2). Production tested at VISO for 1 second, in accordance
with UL 60950-1 (edition. 2).
Maximum approved working voltage for basic (single) isolation
according UL 60950-1 (edition 2).
Minimum distance through air from IP leads to signal leads.
Minimum distance along package body from IP leads to signal
leads.
Rating
2400
420
297
3.9
3.9
Unit
V
RMS
V
PK or
VDC
V
RMS
mm
mm
Working Voltage for Basic Isolation
Clearance
Creepage
V
WVBI
D
cl
D
cr
THERMAL CHARACTERISTICS
Characteristic
Package Thermal Resistance
(Junction to Ambient)
Package Thermal Resistance
(Junction to Lead)
Symbol
R
θJA
Test Conditions*
Mounted on the Allegro 85-0593 evaluation board with 400 mm
2
of
4 oz. copper on each side, connected to pins 1 and 2, and to pins 3
and 4, with thermal vias connecting the layers. Performance values
include the power consumed by the PCB.
Mounted on the Allegro ASEK723 evaluation board.
Value
23
Units
°C/W
R
θJL
5
°C/W
*Additional thermal information available on the Allegro website.
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
3
ACS723
High-Accuracy, Galvanically Isolated Current Sensor IC
with Small Footprint SOIC8 Package
VCC
Master Current
Supply
To All Subcircuits
POR
Programming
Control
Hall
Current
Drive
IP+
IP+
Temperature
Sensor
EEPROM and
Control Logic
Offset
Control
Sensitivity
Control
Dynamic Offset
Cancellation
Tuned
Filter
VIOUT
IP–
IP–
BW_SEL
GND
Functional Block Diagram
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
4
ACS723
High-Accuracy, Galvanically Isolated Current Sensor IC
with Small Footprint SOIC8 Package
PINOUT DIAGRAM AND TERMINAL LIST
IP+
IP+
IP–
IP–
1
2
3
4
8
7
6
5
VCC
VIOUT
BW_SEL
GND
Pinout Diagram
Terminal List Table
Number
1, 2
3, 4
5
6
7
8
Name
IP+
IP–
GND
BW_SEL
VIOUT
VCC
Description
Terminals for current being sensed; fused internally
Terminals for current being sensed; fused internally
Signal ground terminal
Terminal for selecting 20 kHz or 80 kHz bandwidth
Analog output signal
Device power supply terminal
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
5
