• 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 = 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
• Pin-selectable band width: 80 kHz for high bandwidth
applications or 20 kHz for low noise performance
•
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
• 3 to 3.6 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…
pe d
Ty ste
te
FEATURES AND BENEFITS
DESCRIPTION
The Allegro
™
ACS722 current sensor IC is an economical and
precise solution for AC or DC current sensing in industrial,
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
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 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.
The terminals of the conductive path are electrically isolated
from the sensor leads (pins 9 through 16). This allows the
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.
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
Package: 16-pin SOICW (suffix MA)
Approximate Scale 1:1
1
IP+
2
IP+
3
IP+
4
IP+
ACS722
NC
GND
NC
16
15
14
13
12
11
10
9
C
BYPASS
0.1
m
F
C
L
+I
P
BW_SEL
I
P
VIOUT
–I
P
5
IP–
6
IP–
7
IP–
8
IP–
NC
VCC
NC
The ACS722 outputs an
analog signal, V
IOUT
, that
changes, proportionally, with
the bidirectional AC or DC
primary sensed current, I
P
,
within the specified measure-
ment range. The BW_SEL pin
can be used to select one of
the two bandwidths to opti-
mize the noise performance.
Grounding the BW_SEL pin
puts the part in the high
bandwidth (80 kHz) mode.
Typical Application
ACS722-DS, Rev 1
ACS722KMA
High Accuracy, Hall-effect Based Current Sensor
IC in High Isolation SOIC16 Package
Description (continued)
• Chopper stabilization results in extremely stable quiescent
output voltage
• Nearly zero magnetic hysteresis
• Ratiometric output from supply voltage
Features and Benefits (continued)
The ACS722 is provided in a low profile surface mount SOIC16
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.
Selection Guide
Part Number
ACS722KMATR-10AB-T
ACS722KMATR-20AB-T
ACS722KMATR-40AB-T
1
Contact Allegro
I
PR
(A)
±10
±20
±40
Sens(Typ) at V
CC
= 3.3 V
(mV/A)
132
66
33
T
A
(°C)
Packing
1
-40 to 125
Tape and Reel, 3000 pieces per reel
for additional packing options.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
ACS722KMA
High Accuracy, Hall-effect Based Current Sensor
IC in High Isolation SOIC16 Package
SPECIFICATIONS
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Voltage
Reverse Output Voltage
Operating Ambient Temperature
Junction Temperature
Storage Temperature
Symbol
V
CC
V
RCC
V
IOUT
V
RIOUT
T
A
T
J
(max)
T
stg
Range K
Notes
Rating
6
–0.1
25
–0.1
–40 to 125
165
–65 to 165
Units
V
V
V
V
°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 3000 V
RMS
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)
Maximum approved working voltage for reinforced
isolation according to 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
4800
1550
1097
800
565
7.5
8.2
Unit
V
RMS
V
PK
V
RMS
or VDC
V
PK
V
RMS
or VDC
mm
mm
Working Voltage for Basic Isolation
V
WVBI
Working Voltage for Reinforced Isolation
V
WVRI
D
cl
D
cr
Clearance
Creepage
Thermal Characteristics
Characteristic
Package Thermal Resistance
(Junction to Ambient)
Package Thermal Resistance
(Junction to Lead)
Symbol
R
θJA
R
θJL
Test Conditions*
Mounted on the Allegro 85-0738 evaluation board with 700 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 ASEK 722 evaluation board.
Value
23
Units
ºC/W
5
ºC/W
*Additional thermal information available on the Allegro website.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
ACS722KMA
High Accuracy, Hall-effect Based Current Sensor
IC in High Isolation SOIC16 Package
VCC
Master Current
Supply
To All Subcircuits
POR
Programming
Control
Hall
Current
Drive
IP+
IP+
IP+
IP+
Temperature
Sensor
EEPROM and
Control Logic
Offset
Control
Sensitivity
Control
Dynamic Offset
Cancellation
Tuned
Filter
VIOUT
IP
–
IP
–
IP
–
IP–
BW_SEL
GND
Functional Block Diagram
IP+ 1
IP+ 2
IP+ 3
IP+ 4
IP-
IP-
IP-
IP-
5
6
7
8
16 NC
15 GND
14 NC
13 BW_SEL
12 VIOUT
11 NC
10 VCC
9 NC
Terminal List Table
Number
1, 2, 3, 4
5, 6, 7, 8
9, 16
10
11, 14
12
13
15
Name
IP+
IP-
NC
VCC
NC
VIOUT
BW_SEL
GND
Description
Terminals for current being sensed; fused internally
Terminals for current being sensed; fused internally
No internal connection; recommended to be left unconnected in order to
maintain high creepage.
Device power supply terminal
No internal connection; recommened to connect to GND for the best ESD
performance
Analog output signal
Terminal for selecting 20 kHz or 80 kHz bandwidth
Signal ground terminal
Pin-out Diagram
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
ACS722KMA
High Accuracy, Hall-effect Based Current Sensor
IC in High Isolation SOIC16 Package
COMMON ELECTRICAL CHARACTERISTICS
1:
valid through the full range of T
A
= –40°C to 125°C , and at V
CC
=
3.3 V; unless otherwise specified
Characteristic
Supply Voltage
Supply Current
Output Capacitance Load
Output Resistive Load
Primary Conductor Resistance
Magnetic Coupling Factor
Rise Time
Symbol
V
CC
I
CC
C
L
R
L
R
IP
C
F
t
r
I
P
= I
P
(max), T
A
= 25°C, C
L
= 1 nF,
BW_SEL tied to GND
I
P
= I
P
(max), T
A
= 25°C, C
L
= 1 nF,
BW_SEL tied to VCC
I
P
= I
P
(max), T
A
= 25°C, C
L
= 1 nF,
BW_SEL tied to GND
I
P
= I
P
(max), T
A
= 25°C, C
L
= 1 nF,
BW_SEL tied to VCC
I
P
= I
P
(max), T
A
= 25°C, C
L
= 1 nF,
BW_SEL tied to GND
I
P
= I
P
(max), T
A
= 25°C, C
L
= 1 nF,
BW_SEL tied to VCC
Small signal –3 dB; C
L
= 1 nF,
BW_SEL tied to GND
Small signal –3 dB; C
L
= 1nF,
BW_SEL tied to VCC
Input referenced noise density;
T
A
= 25°C, C
L
= 1 nF
Input referenced noise; BWi = 80 kHz,
T
A
= 25°C, C
L
= 1 nF
Input referenced noise; BWi = 20 kHz,
T
A
= 25°C, C
L
= 1 nF
Through full range of I
P
R
L
= 4.7 kΩ, T
A
= 25°C
R
L
= 4.7 kΩ, T
A
= 25°C
Output reaches 90% of steady-state
level, T
A
= 25°C, I
P
= I
PR
(max) applied
V
CC
within V
CC
(min) and V
CC
(max)
VIOUT to GND
VIOUT to GND
T
A
= 25°C
Test Conditions
Min.
3
–
–
4.7
–
–
–
–
–
–
–
–
–
–
–
–
–
–
V
CC
–
0.33
–
–
Typ.
3.3
9
–
–
0.85
4.5
4
17.5
2
5
5
22.5
80
20
300
84
42
±1
–
–
64
–
0.33
–
Max.
3.6
12
10
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Units
V
mA
nF
kΩ
mΩ
G/A
μs
μs
μs
μs
μs
μs
kHz
kHz
µA
(rms)
/
√Hz
mA
(rms)
mA
(rms)
%
V
V
μs
Propagation Delay
t
pd
Response Time
t
RESPONSE
Internal Bandwidth
BWi
Noise Density
I
ND
Noise
Nonlinearity
Saturation
Voltage
2
I
N
E
LIN
V
OH
V
OL
Power-On Time
1
Device
t
PO
may be operated at higher primary current levels, I
P
, ambient temperatures, T
A
, and internal leadframe temperatures, provided the Maximum Junction Tempera-
ture, T
J
(max), is not exceeded.
2
The sensor IC will continue to respond to current beyond the range of I until the high or low saturation voltage; however, the nonlinearity in this region will be worse than
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