ACS709: High Bandwidth, Fast Fault Response Current Sensor IC In Thermally Enhanced Package

The Allegro ACS709 current sensor IC provides economical and precise means for current sensing applications in industrial, automotive, commercial, and communications systems. The device is offered in a small footprint surface mount package that allows easy implementation in customer applications.

The ACS709 consists of a precision linear Hall sensor integrated circuit with a copper conduction path located near the surface of the silicon die. Applied current flows through the copper conduction path, and the analog output voltage from the Hall sensor IC linearly tracks the magnetic field generated by the applied current. The accuracy of the ACS709 is maximized with this patented packaging configuration because the Hall element is situated in extremely close proximity to the current to be measured.

High level immunity to current conductor dV/dt and stray electric fields, offered by Allegro proprietary integrated shield technology, guarantees low output ripple and low offset drift in high-side applications.

The voltage on the Overcurrent Input (VOC pin) allows customers to define an overcurrent fault threshold for the device. When the current flowing through the copper conduction path (between the IP+ and IP– pins) exceeds this threshold, the open drain Overcurrent Fault pin will transition to a logic low state. Factory programming of the linear Hall sensor IC inside of the ACS709 results in exceptional accuracy in both analog and digital output signals.

The internal resistance of the copper path used for current sensing is typically 1.1 mΩ, for low power loss. Also, the current conduction path is electrically isolated from the low voltage device inputs and outputs. This allows the ACS709 family of sensor ICs to be used in applications requiring electrical isolation, without the use of opto-isolators or other costly isolation techniques.

ACS709-10 UL Certificate of Compliance (PDF)

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 applications, contact Allegro Sales.

DATASHEETS
SAMPLE & BUY

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

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  • Features and BenefitsFeatures and Benefits
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  • Technical DocsTechnical Docs
  • NewsNews
  • Industry-leading noise performance with 120 kHz bandwidth through proprietary amplifier and filter design techniques
  • Integrated shield greatly reduces capacitive coupling from current conductor to die due to high dV/dt, and prevents offset drift in high-side applications
  • Small footprint surface mount QSOP24 package
  • 2100 VRMS isolation voltage between primary current path and sensor IC electronics
  • 1.1 mΩ primary conductor resistance for low power loss
  • User-settable Overcurrent Fault level
  • Overcurrent Fault signal typically responds to an overcurrent condition in <2 µs
  • Filter pin capacitor sets analog signal bandwidth
  • ±2% typical output error
  • 3 to 5.5 V, single supply operation
  • Factory trimmed sensitivity, quiescent output voltage, and associated temperature coefficients
  • Chopper stabilization results in extremely stable quiescent output voltage
  • Ratiometric output from supply voltage

This device is supplied in a 24-pin QSOP (suffix LF) package.

LF QSOP 24 leads

LF Package .stp Model

Design Support Tools

Allegro MicroSystems, LLC provides Gerber files for reference only. Any material, information, or instructions are provided AS IS without warranty of any kind. It is the responsibility of the User(s) to optimize any Printed Circuit Board (PCB) layout, as well as the selection of any components, for the specific application of the User(s).

Frequently-Asked Questions

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Product Image Functional Block Diagram Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
ACS709LLFTR-10BB-T 24-lead QSOP -40°C to 150°C Yes View Data Not for new design Contact your
local sales rep
Check Stock
ACS709LLFTR-20BB-T 24-lead QSOP -40°C to 150°C Yes View Data Not for new design Contact your
local sales rep
Check Stock
ACS709LLFTR-35BB-T 24-lead QSOP -40°C to 150°C Yes View Data Not for new design Contact your
local sales rep
Check Stock
ACS709LLFTR-6BB-T 24-lead QSOP -40°C to 150°C Yes View Data Not for new design Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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