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ACS72981ELR Datasheet Preview

ACS72981ELR Datasheet

Current Sensor

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ACS72981xLR
High-Precision Linear Hall-Effect-Based
Current Sensor IC with 200 µΩ Current Conductor
FEATURES AND BENEFITS
• AEC-Q100 automotive qualification
• High-bandwidth 250 kHz analog output
Less than 2 μs output response time
• 3.3 V and 5 V supply operation
Ultralow power loss: 200 μΩ internal conductor
resistance
• Industry-leading noise performance and increased
bandwidth through proprietary amplifier and filter design
techniques
• Greatly improved total output error through digitally
programmed and compensated gain and offset over the
full operating temperature range
• Small package size, with easy mounting capability
• Monolithic Hall IC for high reliability
• Output voltage proportional to AC or DC currents
• Factory-trimmed for accuracy
• Extremely stable zero amp output offset voltage over
temperature and lifetime
PACKAGE:
7-pin PSOF package (suffix LR)
Not to scale
DESCRIPTION
TheAllegro™ACS72981 family of current sensor ICs provides
economical and precise solutions forAC or DC current sensing.
A 250 kHz bandwidth makes it ideal for motor control, load
detection and management, power supply and DC-to-DC
converter control, and inverter control. The <2 µs response
time enables overcurrent fault detection in safety-critical
applications.
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 magnetic signal to the Hall transducer.
A precise, proportional output voltage is provided by the
low-offset, chopper-stabilized BiCMOS Hall IC, which is
programmed for accuracy at the factory. Proprietary digital
temperature compensation technology greatly improves the
zero output voltage and output sensitivity accuracy over
temperature and lifetime.
The output of the device increases when an increasing current
flows through the primary copper conduction path (from
terminal 5 to terminal 6), which is the path used for current
sampling. The internal resistance of this conductive path is
200 μΩ typical, providing low power loss and increasing power
density in the application.
The sensor employs differential sensing techniques that virtually
eliminate output disturbance due to common-mode interfering
magnetic field.
Continued on the next page…
ACS72981xLR
5
IP+
VIOUT 3
IP
6
IP–
GND 2
1
VCC
VOUT
CL
CBYP
0.1 µF
Supply
Typical Application
The ACS72981xLR outputs an analog signal, VOUT , that varies linearly with the
bidirectional AC or DC primary sampled current, IP , within the range specified.
ACS72981xLR-DS, Rev. 8
MCO-0000374
December 6, 2019




Allegro

ACS72981ELR Datasheet Preview

ACS72981ELR Datasheet

Current Sensor

No Preview Available !

ACS72981xLR
High-Precision Linear Hall-Effect-Based
Current Sensor IC with 200 µΩ Current Conductor
DESCRIPTION (CONTINUED)
The thickness of the copper conductor allows survival of the device
at high overcurrent conditions. The terminals of the conductive path
are electrically isolated from the signal leads (pins 1 through 3).
The device is fully calibrated prior to shipment from the factory.
The ACS72981 family is lead (Pb) free. All leads are plated with
100% matte tin, and there is no Pb inside the package. The heavy
gauge leadframe is made of oxygen-free copper.
SELECTION GUIDE
Part Number
ACS72981LLRATR-050B3
ACS72981LLRATR-050B5
ACS72981LLRATR-050U3
ACS72981LLRATR-050U5
ACS72981LLRATR-100B3
ACS72981LLRATR-100B5
ACS72981LLRATR-100U3
ACS72981LLRATR-100U5
ACS72981KLRATR-150B3
ACS72981KLRATR-150B5
ACS72981KLRATR-150U3
ACS72981KLRATR-150U5
ACS72981ELRATR-200B3
ACS72981ELRATR-200B5
ACS72981ELRATR-200U3
ACS72981ELRATR-200U5
Primary Sampled Current,
IP (A)
±50
±50
50
50
±100
±100
100
100
±150
±150
150
150
±200
±200
200
200
[1] Measured at nominal supply voltage.
[2] Contact Allegro for additional packing options.
ACS 72981 L LRA TR - 050 B 5
Sensitivity
Sens (Typ.)
(mV/A) [1]
26.4
40
52.8
80
13.2
20
26.4
40
8.8
13.33
17.6
26.66
13.2
20
6.6
10
Nominal Supply
Voltage (V)
3.3
5
3.3
5
3.3
5
3.3
5
3.3
5
3.3
5
3.3
5
3.3
5
TA
(°C)
–40 to 150
–40 to 125
–40 to 85
Packing [2]
3000 pieces per 13-inch reel
Supply Voltage:
5 – VCC = 5 V
3 – VCC = 3.3 V
Output Directionality:
B – Bidirectional (positive and negative current)
U – Unidirectional (only positive current)
Current Sensing Range (A)
Packing Designator
Package Designator
Operating Temperature Range
5 Digit Part Number
Allegro Current Sensor
2
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com



Part Number ACS72981ELR
Description Current Sensor
Maker Allegro
Total Page 3 Pages
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