ACS780xLR
High-Precision Linear Hall-Effect-Based
Current Sensor IC With 200 µΩ Current Conductor
FEATURES AND BENEFITS
▪ Core-less, micro-sized, 100 A continuous current package
▪ Ultra-low power loss: 200 µΩ internal conductor
resistance
▪ Immunity to common-mode field interference
▪ Greatly improved total output error through digitally
programmed and compensated gain and offset over the full
operating temperature range
▪ Industry-leading noise performance through proprietary
amplifier and filter design techniques
▪ Integrated shield greatly reduces capacitive coupling from
current conductor to die due to high dV/dt signals, and
prevents offset drift in high-side, high-voltage applications
▪ Monolithic Hall IC for high reliability
▪ 4.5 to 5.5 V, single supply operation
▪ 120 kHz typical bandwidth
▪ 3.6 µs output rise time in response to step input current
▪ Output voltage proportional to AC or DC currents
▪ Factory-trimmed for accuracy
▪ Extremely stable quiescent output voltage
▪ AEC-Q100 automotive qualification
DESCRIPTION
The Allegro ACS780xLR is a fully integrated current sensor
linear IC in a new core-less package designed to sense AC and
DC currents up to 100 A. This automotive-grade, low-profile
(1.5 mm thick) sensor IC package has a very small footprint.
The Hall sensor technology also incorporates common-mode
field rejection to optimize performance in the presence of
interfering magnetic fields generated by nearby current-carrying
conductors.
The device consists of a precision, low-offset linear Hall circuit
with a copper conduction path located near the die. Applied
current flowing through this copper conduction path generates
a magnetic field which the Hall IC converts into a proportional
voltage. Device accuracy is optimized through the close
proximity of the primary conductor to the Hall transducer and
factory programming of the sensitivity and quiescent output
voltage at the Allegro factory.
Chopper-stabilized signal path and digital temperature
compensation technology also contribute to the stability of the
device across the operating temperature range.
High-level immunity to current conductor dV/dt and stray
electric fields is offered by Allegro proprietary integrated shield
technology, for low-output voltage ripple and low-offset drift
in high-side, high-voltage applications.
The output of the device has a positive slope (>V
CC
/ 2) when an
increasing current flows through the primary copper conduction
Continued on the next page…
PACKAGE:
7-pin PSOF package (suffix LR)
Not to scale
ACS780xLR
5
I
P
6
IP–
VCC
IP+
VOUT
GND
3
2
C
BYP
0.1 µF
5V
R
F
C
F
V
OUT
1
Typical Application
Application 1: The ACS780xLR outputs an analog signal, V
OUT
, that varies linearly with the bidirectional AC or DC primary
current, I
P
, within the range specified. C
F
is for optimal noise management, with values that depend on the application.
ACS780xLR-DS, Rev. 3
MCO-0000275
January 30, 2018
ACS780xLR
High-Precision Linear Hall-Effect-Based
Current Sensor IC With 200 µΩ Current Conductor
DESCRIPTION (CONTINUED)
path (from terminal 5 to terminal 6), which is the path used for
7), allowing the device to operate safely with voltages up to 100 V
current sampling. The internal resistance of this conductive path is peak on the primary conductor.
200 µΩ typical, providing low power loss.
The device is fully calibrated prior to shipment from the factory.
The thickness of the copper conductor allows survival of the device The ACS780xLR family is lead (Pb) free. All leads are plated with
at high overcurrent conditions. The terminals of the conductive path 100% matte tin, and there is no Pb inside the package. The heavy
are electrically isolated from the signal leads (pins 1 through 4, and
gauge leadframe is made of oxygen-free copper.
SELECTION GUIDE
Part Number
ACS780LLRTR-050B-T
ACS780LLRTR-050U-T
ACS780LLRTR-100B-T
ACS780LLRTR-100U-T
ACS780KLRTR-150B-T
ACS780KLRTR-150U-T
[1]
Contact Allegro
Sensed Current
Direction
Bidirectional
Unidirectional
Bidirectional
Unidirectional
Bidirectional
Unidirectional
Primary Sampled
Current, I
P
(A)
±50
0 to 50
±100
0 to 100
±150 transient
±100 continuous
0 to 150 transient
0 to 100 continuous
Sensitivity
Sens (Typ.)
(mV/A)
40.
60.
20.
40.
13.33
T
OP
(°C)
Packing
[1]
–40 to 150
Tape and reel
–40 to 125
26.66
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
ACS780xLR
High-Precision Linear Hall-Effect-Based
Current Sensor IC With 200 µΩ Current Conductor
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Characteristic
Forward Supply Voltage
Reverse Supply Voltage
Forward Output Voltage
Reverse Output Voltage
Output Source Current
Output Sink Current
Nominal Operating Ambient Temperature
Maximum Junction
Storage Temperature
Symbol
V
CC
V
RCC
V
OUT
V
RIOUT
I
OUT(Source)
I
OUT(Sink)
T
OP
T
J
(max)
T
stg
VOUT to GND
Minimum pull-up resistor of 500 Ω
Range K
Range L
Notes
Rating
6
–0.5
25
–0.5
2.8
10
–40 to 125
–40 to 150
165
–65 to 165
Unit
V
V
V
V
mA
mA
°C
°C
°C
°C
THERMAL CHARACTERISTICS:
May require derating at maximum conditions
Characteristic
Symbol
Test Conditions
[1]
Mounted on the Allegro evaluation board ASEK780
85-0807-001 with FR4 substrate and 8 layers of 2 oz.
copper (with an area of 1530 mm
2
per layer) connected to
the primary leadframe and with thermal vias connecting
the copper layers. Performance is based on current flow-
ing through the primary leadframe and includes the power
consumed by the PCB.
Value
Unit
Package Thermal Resistance
R
θJA
18
°C/W
[1]
Additional
thermal information available on the Allegro website
TYPICAL OVERCURRENT CAPABILITIES
[2][3]
Characteristic
Symbol
Notes
T
A
= 25°C, 1 s on time, 60 s off time
Overcurrent
I
POC
T
A
= 85°C, 1 s on time, 35 s off time
T
A
= 125°C, 1 s on time, 30 s off time
T
A
= 150°C, 1 s on time, 10 s off time
was done with Allegro evaluation board (85-0807-001). The maximum allowed current is limited by T
J
(max) only.
[3]
For more overcurrent profiles, please see FAQ on the Allegro website, www.allegromicro.com.
[2]
Test
Rating
285
225
170
95
Unit
A
A
A
A
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
ACS780xLR
High-Precision Linear Hall-Effect-Based
Current Sensor IC With 200 µΩ Current Conductor
IP+
VCC
ACS780xLR
Master Current
Supply
To all subcircuits
Hall Current
Drive
Temperature
Sensor
Sensitivity
Control
Dynamic Offset
Cancellation
EEPROM and
Control Logic
Offset
Control
Programming
Control
Amp
Tuned
Filter
VOUT
IP–
GND
Functional Block Diagram
IP+ 5
NC
4
Terminal List Table
3 VOUT
2 GND
Number
1
2
3
4
5
6
7
Name
VCC
GND
VOUT
NC
IP+
IP–
NC
Description
Device power supply terminal
Signal ground terminal
Analog output signal
No connection, connect to GND for optimal
ESD performance
Terminal for current being sampled
Terminal for current being sampled
No connection, connect to GND for optimal
ESD performance
IP– 6
7
NC
1 VCC
Pinout Diagram
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
ACS780xLR
High-Precision Linear Hall-Effect-Based
Current Sensor IC With 200 µΩ Current Conductor
COMMON OPERATING CHARACTERISTICS
[1]
valid at T
OP
= –40°C to 150°C and V
CC
= 5 V, unless otherwise specified
Characteristic
Supply Voltage
Supply Current
Power-On Time
Undervoltage Lockout (UVLO)
Threshold
UVLO Enable/Disable Delay
Time
Symbol
V
CC
I
CC
t
PO
V
UVLOH
V
UVLOL
t
UVLOE
t
UVLOD
V
PORH
V
PORL
t
PORR
V
z
BW
i
f
C
f
OSC
t
pd
t
r
t
RESPONSE
V
SAT(HIGH)
V
SAT(LOW)
R
OUT
R
L(PULLUP)
R
L(PULLDWN)
C
L
R
PRIMARY
V
OUT(QBI)
V
OUT(QU)
Rat
ERRVOUT(Q)
Rat
ERRSens
CMFR
Output open
T
A
= 25°C, C
BYPASS
= Open, C
L
= 1 nF
T
A
= 25°C, V
CC
rising and device function enabled
T
A
= 25°C, V
CC
falling and device function disabled
T
A
= 25°C, C
BYPASS
= Open, C
L
= 1 nF, V
CC
Fall Time (5 V to 3 V) = 1.5 µs
T
A
= 25°C, C
BYPASS
= Open, C
L
= 1 nF,
V
CC
Recover Time (3 V to 5 V) = 1.5 µs
T
A
= 25°C, V
CC
rising
T
A
= 25°C, V
CC
falling
T
A
= 25°C, V
CC
rising
T
A
= 25°C, I
CC
= 30 mA
Small signal –3 dB, C
L
= 1 nF, T
A
= 25°C
T
A
= 25°C
T
A
= 25°C
T
A
= 25°C, C
L
= 1 nF
T
A
= 25°C, C
L
= 1 nF
T
A
= 25°C, C
L
= 1 nF
T
A
= 25°C, R
LOAD
= 10 kΩ to GND
T
A
= 25°C, R
LOAD
= 10 kΩ to VCC
R
L
=4.7 kΩ from VOUT to GND, V
OUT
= V
CC
/ 2
VOUT to VCC
VOUT to GND
VOUT to GND
T
A
= 25°C
I
P
= 0 A, T
A
= 25°C
Unidirectional variant, I
P
= 0 A, T
A
= 25°C
Through supply voltage range (relative to V
CC
= 5 V)
Through supply voltage range (relative to V
CC
= 5 V)
Magnetic field perpendicular to Hall plates
Test Conditions
Min.
4.5
–
–
Typ.
5.0
11
130
4
3.5
64
7
2.9
2.5
64
7.5
120
500
8
2.5
3
3.6
–
–
<1
–
–
1
200
V
CC
/2
V
CC
× 0.1
0
< ±0.5
–35
Max.
5.5
15
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
400
–
–
–
10
–
–
–
–
–
–
Unit
V
mA
µs
V
V
µs
µs
V
V
µs
V
kHz
kHz
MHz
µs
µs
µs
V
mV
Ω
kΩ
kΩ
nF
µΩ
V
V
%
%
dB
–
–
–
–
–
–
–
6.5
–
–
–
–
–
–
4.7
–
–
4.7
4.7
–
–
–
–
–
–
–
Power-On Reset Voltage
Power-On Reset Release Time
Supply Zener Clamp Voltage
Internal Bandwidth
Chopping Frequency
Oscillator Frequency
OUTPUT CHARACTERISTICS
Propagation Delay Time
Rise Time
Response Time
Output Saturation Voltage
DC Output Resistance
Output Load Resistance
Output Load Capacitance
Primary Conductor Resistance
Quiescent Output Voltage
Ratiometry Quiescent Output
Voltage Error
Ratiometry Sensitivity Error
Common-Mode Magnetic Field
Rejection
[1]
Device is factory-trimmed at 5 V, for optimal accuracy.
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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