ACS709
High-Bandwidth, Fast Fault Response Current Sensor IC
in Thermally Enhanced Package
Not for New Design
These parts are in production but have been determined to be
NOT FOR NEW DESIGN. This classification indicates that sale of
this device is currently restricted to existing customer applications.
The device should not be purchased for new design applications
because obsolescence in the near future is probable. Samples are no
longer available.
Date of status change: June 5, 2017
Recommended Substitutions:
For existing customer transition, and for new customers or new appli-
cations, contact Allegro Sales.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, LLC reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no respon-
sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.ACS709
High-Bandwidth, Fast Fault Response Current Sensor IC
in Thermally Enhanced Package
Features and Benefits Description
Industry-leading noise performance with 120 kHz The Allegro ACS709 current sensor IC provides economical
bandwidth through proprietary amplifier and filter and precise means for current sensing applications in industrial,
design techniques automotive, commercial, and communications systems. The
Integrated shield greatly reduces capacitive coupling device is offered in a small footprint surface mount package
from current conductor to die due to high dV/dt, and that allows easy implementation in customer applications.
prevents offset drift in high-side applications
The ACS709 consists of a precision linear Hall sensor integrated
Small footprint surface-mount QSOP24 package
circuit with a copper conduction path located near the surface
High isolation voltage, suitable for line-powered
of the silicon die. Applied current flows through the copper
applications
conduction path, and the analog output voltage from the Hall
1.1 m primary conductor resistance for low power loss
sensor IC linearly tracks the magnetic field generated by the
User-settable Overcurrent Fault level
applied current. The accuracy of the ACS709 is maximized
Overcurrent Fault signal typically responds to an
with this patented packaging configuration because the Hall
overcurrent condition in < 2 s
element is situated in extremely close proximity to the current
Filter pin capacitor sets analog signal bandwidth
to be measured.
2% typical output error
3 to 5.5 V, single supply operation High level immunity to current conductor dV/dt and stray
Factory trimmed sensitivity, quiescent output voltage, electric fields, offered by Allegro proprietary integrated shield
and associated temperature coefficients technology, provides low output ripple and low offset drift in
Chopper stabilization results in extremely stable high-side applications.
quiescent output voltage
The voltage on the Overcurrent Input (VOC pin) allows
Ratiometric output from supply voltage
customers to define an overcurrent fault threshold for the
device. When the current flowing through the copper conduction
Package: 24 pin QSOP (suffix LF)
path (between the IP+ and IP pins) exceeds this threshold,
Continued on the next page
Approximate Scale
Typical Application
1
24
IP+ NC
2
V
23 CC
IP+ NC
Fault_EN
R
3 H
22
IP+ FAULT_EN
R , R Sets resistor divider reference for V
4
H L OC
21
IP+ VOC
5 ACS709 R
20 C Noise and bandwidth limiting filter capacitor
L
F
IP+ VCC
6 330 k
19
IP+ FAULT C Fault delay setting capacitor, 22 nF maximum
OC
I C
P
7 OC
18 0.1 F
B
IP VIOUT
V A Use of capacitor required
8
IOUT
17
IP FILTER
9
16
C
F B Use of resistor optional
IP VZCR
10
1 nF
15
IP GND
A
11
IP NC 14
12
13
IP NC
ACS709A-DS, Rev. 6 February 5, 2019
MCO-0000194