ACS758xCB
Thermally Enhanced, Fully Integrated, Hall Effect-Based
Linear Current Sensor IC with 100
μΩ
Current Conductor
Features and Benefits
▪
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
▪
Total output error improvement through gain and offset
trim over temperature
▪
Small package size, with easy mounting capability
▪
Monolithic Hall IC for high reliability
▪
Ultra-low power loss: 100
μΩ
internal conductor resistance
▪
Galvanic isolation allows use in economical, high-side
current sensing in high voltage systems
▪
AEC Q-100 qualified
Continued on the next page…
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Description
The Allegro
™
ACS758 family of current sensor ICs provides
economical and precise solutions for AC or DC current sensing.
Typical applications include motor control, load detection and
management, power supply and DC-to-DC converter control,
inverter control, and overcurrent fault detection.
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.
High level immunity to current conductor dV/dt and stray
electric fields, offered by Allegro proprietary integrated shield
technology, provides 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
path (from terminal 4 to terminal 5), which is the path used
for current sampling. The internal resistance of this conductive
path is 100
μΩ
typical, providing low power loss.
The thickness of the copper conductor allows survival of the
device at high overcurrent conditions. The terminals of the
TÜV America
Certificate Number:
U8V 12 05 54214 024
UL Certified
File No.: E316429
Package: 5-pin package
PFF
Leadform
PSF
Leadform
PSS
Leadform
Continued on the next page…
Typical Application
+3.3 or 5 V
4
IP+
ACS758
VCC
1
C
BYP
0.1
μF
C
F
IP–
VIOUT
3
R
F
V
OUT
I
P
5
GND
2
Application 1. The ACS758 outputs an analog signal, V
OUT
, that
varies linearly with the uni- or bi-directional AC or DC primary
sampled current, I
P
, within the range specified. C
F
is for optimal
noise management, with values that depend on the application.
ACS758-DS, Rev. 8
ACS758xCB
Thermally Enhanced, Fully Integrated, Hall Effect-Based
Linear Current Sensor IC with
100
μΩ
Current Conductor
Description (continued)
conductive path are electrically isolated from the signal leads (pins
1 through 3). This allows the ACS758 family of sensor ICs to be
used in applications requiring electrical isolation without the use
of opto-isolators or other costly isolation techniques.
The device is fully calibrated prior to shipment from the factory.
The ACS758 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.
Features and Benefits (continued)
▪
3.0 to 5.5 V, single supply operation
▪
120 kHz typical bandwidth
▪
3
μs
output rise time in response to step input current
▪
Output voltage proportional to AC or DC currents
▪
Factory-trimmed for accuracy
▪
Extremely stable output offset voltage
▪
Nearly zero magnetic hysteresis
Selection Guide
Package
Part
Number
1
Terminals
Formed
Formed
Formed
Straight
Formed
Formed
Straight
Formed
Formed
Straight
Straight
Formed
Signal Pins
Formed
Formed
Formed
Formed
Formed
Formed
Straight
Formed
Formed
Formed
Straight
Formed
Primary Sampled
Current , I
P
(A)
±50
50
±100
±100
100
±150
±150
150
±200
±200
±200
200
Sensitivity
Sens (Typ.)
(mV/A)
40.
60.
20.
20.
40.
13.3
13.3
26.7
10.
10.
10.
20.
Current
Directionality
Bidirectional
Unidirectional
Bidirectional
Bidirectional
Unidirectional
Bidirectional
Bidirectional
Unidirectional
Bidirectional
Bidirectional
Bidirectional
Unidirectional
–40 to 85
–40 to 125
34 pieces
per tube
–40 to 150
T
OP
(°C)
Packing
2
ACS758LCB-050B-PFF-T
ACS758LCB-050U-PFF-T
ACS758LCB-100B-PFF-T
ACS758LCB-100B-PSF-T
ACS758LCB-100U-PFF-T
ACS758KCB-150B-PFF-T
ACS758KCB-150B-PSS-T
ACS758KCB-150U-PFF-T
ACS758ECB-200B-PFF-T
ACS758ECB-200B-PSF-T
ACS758ECB-200B-PSS-T
ACS758ECB-200U-PFF-T
1
Additional
2
Contact Allegro
leadform options available for qualified volumes.
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
ACS758xCB
Thermally Enhanced, Fully Integrated, Hall Effect-Based
Linear Current Sensor IC with
100
μΩ
Current Conductor
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
IOUT
V
RIOUT
I
OUT(Source)
I
OUT(Sink)
T
OP
T
J
(max)
T
stg
VIOUT to GND
VCC to VIOUT
Range E
Range K
Range L
Notes
Rating
8
–0.5
28
–0.5
3
1
–40 to 85
–40 to 125
–40 to 150
165
–65 to 165
Units
V
V
V
V
mA
mA
ºC
ºC
ºC
ºC
ºC
Isolation Characteristics
Characteristic
Dielectric Strength Test Voltage*
Working Voltage for Basic Isolation
Working Voltage for Reinforced Isolation
Symbol
V
ISO
V
WFSI
V
WFRI
Notes
Agency type-tested for 60 seconds per
UL standard 60950-1, 2nd Edition
For basic (single) isolation per UL standard
60950-1, 2nd Edition
For reinforced (double) isolation per UL standard
60950-1, 2nd Edition
Rating
4800
990
700
636
450
Unit
VAC
VDC or V
pk
V
rms
VDC or V
pk
V
rms
* Allegro does not conduct 60-second testing. It is done only during the UL certification process.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
ACS758xCB
Thermally Enhanced, Fully Integrated, Hall Effect-Based
Linear Current Sensor IC with
100
μΩ
Current Conductor
Thermal Characteristics
may require derating at maximum conditions
Characteristic
Symbol
Test Conditions*
Mounted on the Allegro evaluation board with
2800 mm
2
(1400 mm
2
on component side and
1400 mm
2
on opposite side) of 4 oz. copper con-
nected to the primary leadframe and with thermal
vias connecting the copper layers. Performance
is based on current flowing through the primary
leadframe and includes the power consumed by
the PCB.
Value
Unit
Package Thermal Resistance
R
θJA
7
ºC/W
*Additional thermal information available on the Allegro website
Typical Overcurrent Capabilities
1,2
Characteristic
Overcurrent
1
Test
Symbol
I
POC
Notes
T
A
= 25°C, 1s duration, 1% duty cycle
T
A
= 85°C, 1s duration, 1% duty cycle
T
A
= 150°C, 1s duration, 1% duty cycle
Rating
1200
900
600
Units
A
A
A
was done with Allegro evaluation board. The maximum allowed current is limited by T
J
(max) only.
2
For more overcurrent profiles, please see FAQ on the Allegro website, www.allegromicro.com.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
ACS758xCB
Thermally Enhanced, Fully Integrated, Hall Effect-Based
Linear Current Sensor IC with
100
μΩ
Current Conductor
Functional Block Diagram
+3.3 to 5 V
IP+
VCC
To all subcircuits
Dynamic Offset
Cancellation
Amp
Filter
Out
VIOUT
0.1
μF
Gain
Gain
Temperature
Coefficient
Trim Control
Offset
Offset
Temperature
Coefficient
IP–
GND
Pin-out Diagram
IP+
4
3
2
1
VIOUT
GND
VCC
IP–
5
Terminal List Table
Number
1
2
3
4
5
Name
VCC
GND
VIOUT
IP+
IP–
Device power supply terminal
Signal ground terminal
Analog output signal
Terminal for current being sampled
Terminal for current being sampled
Description
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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