ACS726 IC Datasheet

ACS726 Datasheet PDF, Equivalent


Part Number

ACS726

Description

Galvanically Isolated Current Sensor IC

Manufacture

Allegro

Total Page 15 Pages
Datasheet
Download ACS726 Datasheet


ACS726
ACS726
Galvanically Isolated Current Sensor IC
With Differential Output and Externally Adjustable Gain
FEATURES AND BENEFITS
• Fully differential architecture for improved immunity to
offset drift and common mode noise
• Spare differential back end amplifier for externally
adjustable gain and bandwidth using simple RC networks
• Greatly improved bandwidth through proprietary
amplifier and filter design techniques
• High bandwidth 120 kHz analog output
• Patented integrated digital temperature compensation
circuitry allows nearly closed-loop accuracy, through
entire temperature range, in an open loop sensor
1.1 mΩ primary conductor resistance for low power loss
and high inrush current withstanding capability
• Small footprint, low-profile QSOP24 package suitable
for space-constrained applications
• Integrated shield virtually eliminates capacitive coupling
from current conductor to die due to high dV/dt voltage
transients
Continued on the next page…
Package: 24-pin QSOP (suffix LF)
DESCRIPTION
The AllegroACS726 current sensor IC family provides
economical and precise solutions for AC current sensing in
industrial, commercial, and communications systems. The
device package allows for easy implementation by the customer.
Typical applications include motor control, load detection and
management, switched-mode power supplies, and overcurrent
fault protection.
The fully differential output gives superior immunity to output
offset drift as well common mode noise.
ACS726 is the first current sensor IC to include a fully
differential back-end amplifier (BEA) that can be used to adjust
gain and bandwidth via external RC networks. The BEA is
fully independent and when unused, it can be powered down
to reduce power consumption.
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
Approximate scale
ACS726-DS, Rev. 1
Continued on the next page…
1
2
IP+
IP+
3
4
IP+
IP+
5 IP+
6 IP+
NC
NC
VCC
VOUTGP
VOUTGN
24
23
22
21
20
ACS726
IP
VINGN
VINGP
19
18
7
8
9
10
11
12
IP–
IP–
IP–
IP–
IP–
IP–
VOUTP
VOUTN
GND
NC
NC
17
16
15
14
13
3.3 V
RFB1
RFB2
CBYPASS
0.1 µF
RIN1
RIN2
Typical Application
Current sensor IC gain can be set using RFB and RIN

ACS726
ACS726
Galvanically Isolated Current Sensor IC
With Differential Output and Externally Adjustable Gain
Features and Benefits (continued)
• 3 to 3.6 V, single supply operation
• Factory-trimmed sensitivity and quiescent output voltage for
improved accuracy
• Chopper stabilization results in extremely stable quiescent
output voltage
• Ratiometric output from supply voltage
Description (continued)
precise, proportional voltage is provided by the low-offset, chopper-
stabilized BiCMOS Hall IC, which is programmed for accuracy
after packaging. The output of the device has a positive differential
voltage ( VOUTP– VOUTN ) when an increasing current flows through
the primary copper conduction path (from pins 1 through 6, to pins
7 through 12), which is the path used for current sensing. The internal
resistance of this conductive path is 1.1 mΩ typical, providing low
power loss.
The terminals of the conductive path are electrically isolated from
the sensor IC signal leads (pins 13 through 24). This allows the
ACS726 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.
The ACS726 is provided in a small, low-profile surface mount
QSOP24 package (suffix LF). 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, excluding the BAE, is fully calibrated
prior to shipment from the factory.
Selection Guide
Part Number
Optimized Range for
Sensed Current, IP
(A)
Linear Range for
Sensed Current, IP
(A)
ACS726LLFTR-20B-T3
±20
±20
ACS726LLFTR-40B-T3
±40
±40
1Measured differently when VCC = 3.3 V and using a 2000 mV dynamic range.
2Contact Allegrofor additional packing options.
3 Variant not intended for automotive applications.
Sensitivity,
Sens (Typ)
(mV/A)1
100
50
Operating
Ambient Tempera-
ture Range
TA, (°C)
–40 to 150
Packing2
Tape and reel, 2500
pieces per 13-in. reel
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Features ACS726 Galvanically Isolated Current Sen sor IC With Differential Output and Ext ernally Adjustable Gain FEATURES AND B ENEFITS • Fully differential archite cture for improved immunity to offset d rift and common mode noise • Spare d ifferential back end amplifier for exte rnally adjustable gain and bandwidth us ing simple RC networks • Greatly im proved bandwidth through proprietary am plifier and filter design techniques High bandwidth 120 kHz analog output • Patented integrated digital tempe rature compensation circuitry allows ne arly closed-loop accuracy, through enti re temperature range, in an open loop s ensor • 1.1 mΩ primary conductor r esistance for low power loss and high i nrush current withstanding capability Small footprint, low-profile QSOP24 package suitable for space-constrained applications • Integrated shield vi rtually eliminates capacitive coupling from current conductor to die due to hi gh dV/dt voltage transients Continued on the next page… Package: 24-pin QSOP (suff.
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