The Allegro™ ACS730 current sensor family provides

economical and precise solutions forAC or DC current sensing

in industrial, commercial, and communications systems. The

devicepackageallowsforeasyimplementationbythecustomer.

Typical applications include motor control, load detection and

management, switched-mode power supplies, and overcurrent

fault protection.

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

theintegratedHallICandconvertedintoaproportionalvoltage.

Deviceaccuracyisoptimizedthroughthecloseproximityofthe

magnetic field to the Hall transducer. A precise, proportional

voltage is provided by the Hall IC, which is programmed

for accuracy after packaging. The output of the device has a

positive slope when an increasing current flows through the

primary copper conduction path (from pins 1 and 2, to pins 3

and 4), which is the path used for current sensing. The internal

resistanceofthisconductivepathistypically1.2mΩ,providing

low power loss.

The terminals of the conductive path are electrically isolated

from the sensor leads (pins 5 through 8). This allows the

ACS730 current sensor to be used in high-side current sense

applicationswithouttheuseofhigh-sidedifferentialamplifiers

or other costly isolation techniques.

TheACS730 is provided in a small, low-profile surface-mount

SOIC8 package. 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 is fully calibrated

prior to shipment from the factory.

ACS730-DS

• Industry-leading noise performance with greatly

improved bandwidth through proprietary amplifier and

filter design techniques

• High bandwidth 1 MHz analog output

• Patented integrated digital temperature compensation

circuitry allows high accuracy over temperature in an

open loop sensor

• 1.2 mΩ primary conductor resistance for low power loss

and high inrush current withstanding capability

• Small footprint, low-profile SOIC8 package suitable for

space-constrained applications

• Integrated shield virtually eliminates capacitive coupling

from current conductor to die due to high dV/dt voltage

transients

• 5 V, single supply operation

• Output voltage proportional to AC or DC current

• Factory-trimmed sensitivity and quiescent output voltage

for improved accuracy

• High PSRR for noisy environments

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

Typical Application

The ACS730 outputs an

varies linearly with the

bidirectional AC or DC

primary sensed current,

fied.

FEATURES AND BENEFITS

DESCRIPTION

Package: 8-Pin SOIC (suffix LC)

Not to scale

ACS730

0.1 µF

ACS730

1

2

3

4

IP+

IP+

IP–

IP–

VCC

VIOUT

VZCR

GND

8

7

6

5

1 nF