ACS711
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for <100 V Isolation Applications
FEATURES AND BENEFITS
• No external sense resistor required; single package solution
• Reduced power loss:
□ 0.6 mΩ internal conductor resistance on EX package
□ 1.2 mΩ internal conductor resistance on LC package
•
•
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•
Economical low- and high-side current sensing
Output voltage proportional to AC or DC currents
±12.5
A and ±25 A full-scale sensing ranges on LC package
±15.5 A and ±31 A full-scale sensing ranges on EX package
¯ ¯¯¯
Overcurrent ¯ ¯ ¯ ¯ ¯ trips and
l
atches at 100% of full-scale
FAU
L
T
current
Low-noise analog signal path
100 kHz bandwidth
Small footprint, low-profile SOIC8 and QFN packages
3 to 5.5 V single supply operation
Integrated electrostatic shield for output stability
Factory-trimmed for accuracy
Extremely stable output offset voltage
Zero magnetic hysteresis
Ratiometric output from supply voltage
DESCRIPTION
The Allegro
™
ACS711 provides economical and precise
solutions for AC or DC current sensing in <100 V audio,
communications systems, and white goods. The device package
allows for easy implementation by the customer. Typical
applications include circuit protection, current monitoring,
and motor and inverter control.
The device consists of a 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 signal
to the Hall transducer.
The output of the device has a positive slope proportional to
the current flow from IP+ to IP– (pins 1 and 2, to pins 3 and
4). The internal resistance of this conductive path is 0.6 mΩ
for the EX package, and 1.2 mΩ for the LC package, providing
a non-intrusive measurement interface that saves power in
applications that require energy efficiency.
The ACS711 is optimized for low-side current sensing
applications, although the terminals of the conductive path
are electrically isolated from the sensor IC leads, providing
sufficient internal creepage and clearance dimensions for a
low AC or DC working voltage applications. The thickness
of the copper conductor allows survival of the device at up to
Continued on the next page…
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PACKAGES:
8-pin SOICN
with internally fused path
(LC package)
Not to scale
12-contact QFN
3 mm × 3 mm × 0.75 mm
(EX package)
Typical Application
+3.3 V
IP+
IP+
VIOUT
I
P
VCC
C
BYP
0.1
μF
C
LOAD
Application 1. The ACS711 outputs
an analog signal, V
IOUT
, that varies
linearly with the bi-directional AC or
DC primary current, I
P
, within the
¯ L¯
¯
range specified. The ¯ ¯¯¯ ¯ pin trips
FAU¯ T
when I
P
reaches ±100% of its full-
scale current.
ACS711
IP–
IP–
FAULT
GND
R
PU
ACS711A-DS, Rev. 4
June 23, 2017
ACS711
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
DESCRIPTION (CONTINUED)
5× overcurrent conditions.
The ACS711 is provided in small, surface-mount packages: SOIC8
and QFN12. 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
ACS711ELCTR-12AB-T
ACS711KLCTR-12AB-T
ACS711ELCTR-25AB-T
ACS711KLCTR-25AB-T
ACS711EEXLT-31AB-T
[3][4]
ACS711KEXLT-31AB-T
[3]
ACS711EEXLT-15AB-T
[3][4]
ACS711KEXLT-15AB-T
[3]
[1]
Contact Allegro
[2]
Sensitivity
T
A
(°C)
–40 to 85
–40 to 125
–40 to 85
–40 to 125
–40 to 85
–40 to 125
–40 to 85
–40 to 125
Optimized Accuracy
Range, I
P
(A)
±12.5
±25
±31
±15.5
Sensitivity
[2]
,
Sens (Typ)
(mV/A)
110
Package
Packing
[1]
8-pin SOICN
55
45
90
3000 pieces/reel
12-contact QFN with
fused current loop
1500 pieces/reel
for additional packing options.
measured with V
CC
= 3.3 V.
[3]
QFN package not qualified for automotive applications.
[4]
Variants ACS711EEXLT-15AB-T and ACS711EEXLT-31AB-T are Pre-End-of-Life. These device variants are approaching end of life.
Within a minimum of 6 months, these device variants will enter their final, Last Time Buy, order phase. Date of status change: June 5,
2017. Suggested replacements include ACS711KEXLT-15AB-T and ACS711KEXLT-31AB-T, respectively.
ABSOLUTE MAXIMUM RATINGS
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Voltage
Reverse Output Voltage
Working Voltage for Basic Isolation
¯ ¯¯¯ ¯ Pin Voltage
¯ L¯
¯
FAU¯ T
Overcurrent Transient Tolerance
Nominal Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V
CC
V
RCC
V
IOUT
V
RIOUT
V
WORKING
V
FAULT
I
POC
T
A
T
J
(max)
T
stg
1 pulse, 100 ms
Range E
Range K
Voltage applied between pins 1-4 and 5-8
Notes
Rating
7
–0.1
7
–0.1
100
7
100
–40 to 85
–40 to 125
165
–65 to 170
Units
V
V
V
V
VAC peak
or VDC
V
A
°C
°C
°C
°C
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
ACS711
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
Functional Block Diagram
V
CC
VCC
R
PU
C
BYP
Master Current
Supply
To all subcircuits
Current Fault
Comparator
D
240 kΩ
FAULT
Power-on
Reset
Hall Current
Drive
Reset
IP+
IP+
Sensitivity
Temperature
Coefficient Trim
Dynamic Offset
Cancellation
Signal
Recovery
VIOUT
C
LOAD
IP−
IP−
Sensitivity
Trim
0 Ampere
Offset Adjust
GND
PINOUT DIAGRAMS
VIOUT
11
VCC
12
IP+
IP+
IP–
IP–
1
2
3
4
5
6
10 NC
9
8
7
FAULT
GND
NC
NC
NC
IP+
IP+
IP–
IP–
1
2
3
4
8
7
6
5
VCC
VIOUT
FAULT
GND
EX Package
LC Package
TERMINAL LIST TABLE
Name
GND
¯ ¯¯¯ ¯
¯ L¯
¯
FAU¯ T
IP–
IP+
NC
VCC
VIOUT
Number
EX
5
6
3 and 4
1 and 2
7, 8, 9, 10
12
11
LC
5
6
3 and 4
1 and 2
–
8
7
Description
Signal ground terminal
Overcurrent fault; active low
Terminals for current being sensed; fused internally
Terminals for current being sensed; fused internally
No connection; connect to GND for optimal ESD performance.
Device power supply terminal
Analog output signal
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
ACS711
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
COMMON OPERATING CHARACTERISTICS:
Valid across the full range of T
A
for the LC package and at T
A
= 25°C for the EX package,
V
CC
= 3.3 V, unless otherwise specified
Characteristic
ELECTRICAL CHARACTERISTICS
Supply Voltage
[1]
Supply Current
Output Capacitance Load
Output Resistive Load
Primary Conductor Resistance
VIOUT Rise Time
Propagation Delay Time
Response Time
Internal Bandwidth
[2]
Nonlinearity
Symmetry
VIOUT Saturation Voltages
Quiescent Output Voltage
Power-On Time
¯
¯ ¯ ¯¯ ¯ PIN CHARACTERISTICS
¯ L¯
FAU¯ T
¯ ¯¯¯ ¯ Operating Point
¯ L¯
¯
FAU¯ T
¯ ¯¯¯ ¯ Output Pullup
¯ L¯
¯
FAU¯ T
Resistor
¯ ¯¯¯ ¯ Output Voltage
¯ L¯
¯
FAU¯ T
¯ ¯¯¯ ¯ Response Time
¯ L¯
¯
FAU¯ T
V
CC
Off Voltage Level for
Fault Reset
[3]
V
CC
Off Duration for
Fault Reset
[3]
[1]
Devices
Symbol
V
CC
I
CC
C
LOAD
R
LOAD
R
IP
t
r
t
PROP
t
RESPONSE
BW
I
E
LIN
E
SYM
V
IOH
V
IOL
V
IOUT(Q)
t
PO
I
P
= 0 A, T
A
= 25°C
Test Conditions
Min.
3
Typ.
3.3
4
–
–
0.6
1.2
3.5
1.2
4.6
100
±1
100
–
–
V
CC
/ 2
35
Max.
5.5
5.5
1
–
–
–
–
–
–
–
–
–
–
0.3
–
–
Units
V
mA
nF
kΩ
mΩ
mΩ
μs
µs
µs
kHz
%
%
V
V
V
μs
V
CC
= 3.3 V, output open
VIOUT to GND
VIOUT to GND
EX package
LC package, T
A
= 25°C
I
P
= I
PMAX
, T
A
= 25°C, COUT = open
I
P
= I
P
(max), T
A
= 25°C, COUT = open
I
P
= I
P
(max), T
A
= 25°C, COUT = open
–3 dB, T
A
= 25°C
Over full range of I
P
Apply full scale I
P
–
–
15
–
–
–
–
–
–
–
–
V
CC
– 0.3
–
–
–
Output reaches 90% of steady-state level, T
A
= 25°C,
20 A present on primary conductor
I
FAULT
R
PU
V
OH
V
OL
t
FAULT
V
CCFR
t
CCFR
R
PU
= 1 kΩ
Measured from | I
P
| > | I
FAULT
| to V
FAULT
≤ V
OL
–
1
–
–
–
–
100
±1 × I
P
–
V
CC
–
0.3
0.3
1.3
–
–
–
–
–
–
–
200
–
A
kΩ
V
V
µs
mV
µs
are programmed for maximum accuracy at 3.3 V V
CC
levels. The device contains ratiometry circuits that accurately alter the 0 A Output
Voltage and Sensitivity level of the device in proportion to the applied V
CC
level. However, as a result of minor nonlinearities in the ratiometry
circuit additional output error will result when V
CC
varies from the 3.3 V V
CC
level. Customers that plan to operate the device from a 5 V regulated
supply should contact their local Allegro sales representative regarding expected device accuracy levels under these bias conditions.
[2]
Calculated using the formula BW = 0.35 / t .
I
r
[3]
After the ¯ ¯¯¯ ¯ pin is latched low, the only way to reset it is through a power-off and power-on cycle on the VCC pin. For fault reset, V
¯ L¯
¯
FAU¯ T
CC
must
stay below V
CCFR
for a period greater than t
CCFR
before settling to the normal operation voltage (3 to 5.5 V).
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
ACS711
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
x12AB PERFORMANCE CHARACTERISTICS for LC package and E Temperature Range
[1]
T
A
= 25°C and V
CC
= 3.3 V, unless otherwise specified
Characteristic
Optimized Accuracy Range
Sensitivity
Noise
[1]
Electrical Offset Voltage
Total Output Error
[3]
[1]
See
[2]
±3
Symbol
I
P
Over full range of I
P
Sens
V
NOISE
V
OE(TA)
V
OE(TOP)HT
V
OE(TOP)LT
E
TOT
Test Conditions
Min.
–12.5
–
–
–
–
–
–
–
–
Typ.
–
110
110
110
11
±5
±40
±50
±5
Max.
12.5
–
–
–
–
–
–
–
–
Units
A
mV/A
mV/A
mV/A
mV
mV
mV
mV
%
Full scale of I
P
applied for 5 ms, T
A
= –40°C to 25°C
Full scale of I
P
applied for 5 ms, T
A
= 25°C to 85°C
T
A
= 25°C, no external low pass filter on VIOUT
I
P
= 0 A, T
A
= 25°C
I
P
= 0 A, T
A
= 25°C to 85°C
I
P
= 0 A, T
A
= –40°C to 25°C
I
P
= ±12.5 A,T
A
= –40°C to 85°C
Characteristic Performance Data for parameter distributions over temperature.
sigma noise voltage.
[3]
Percentage of I , with I = ±12.5 A.
P
P
x12AB PERFORMANCE CHARACTERISTICS for LC package and K Temperature Range
[1]
T
A
= 25°C and V
CC
= 3.3 V, unless otherwise specified
Characteristic
Optimized Accuracy Range
Sensitivity
Noise
[2]
Electrical Offset Voltage
Total Output Error
[3]
[1]
See
Symbol
I
P
Over full range of I
P
Sens
V
NOISE
V
OE(TA)
V
OE(TOP)HT
V
OE(TOP)LT
E
TOT
Test Conditions
Min.
–12.5
–
–
–
–
–
–
–
–
Typ.
–
110
110
110
11
±5
±40
±50
±5
Max.
12.5
–
–
–
–
–
–
–
–
Units
A
mV/A
mV/A
mV/A
mV
mV
mV
mV
%
Full scale of I
P
applied for 5 ms, T
A
= –40°C to 25°C
Full scale of I
P
applied for 5 ms, T
A
= 25°C to 125°C
T
A
= 25°C, no external low pass filter on VIOUT
I
P
= 0 A, T
A
= 25°C
I
P
= 0 A, T
A
= 25°C to 125°C
I
P
= 0 A, T
A
= –40°C to 25°C
I
P
= ±12.5 A,T
A
= –40°C to 125°C
Characteristic Performance Data for parameter distributions over temperature.
[2]
±3 sigma noise voltage.
[3]
Percentage of I , with I = ±12.5 A.
P
P
x15AB PERFORMANCE CHARACTERISTICS
[1]
T
A
= 25°C and V
CC
= 3.3 V, unless otherwise specified
Characteristic
Optimized Accuracy Range
Sensitivity
Noise
[2]
Electrical Offset Voltage
Total Output Error
[3]
[1]
See
[2]
±3
Symbol
I
P
Sens
V
NOISE
V
OE(TA)
V
OE(TOP)HT
V
OE(TOP)LT
E
TOT
Test Conditions
Across full range of I
P
No external low pass filter on VIOUT
I
P
= 0 A
I
P
= 0 A, T
A
= 25°C to T
A
(max)
I
P
= 0 A, T
A
= –40°C to 25°C
I
P
= ±12.5 A,T
A
= –40°C to T
A
(max)
Min.
–15.5
–
–
–
–
–
–
Typ.
–
90
11
±5
±40
±50
±5
Max.
15.5
–
–
–
–
–
–
Units
A
mV/A
mV
mV
mV
mV
%
Characteristic Performance Data for parameter distributions across the full temperature range.
sigma noise voltage.
[3]
Percentage of I , with I = ±15.5 A.
P
P
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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