ALLEGRO ACS706ELC-05C User Manual

Bidirectional 1.5 mΩ Hall Effect Based Linear Current Sensor

with Voltage Isolation and 15 A Dynamic Range

Package LC

Pin 8: VCC

Pin 7: VOUT

Pin 1: IP+

Pin 2: IP+

Pin 3: IP–

Pin 4: IP–

Pins 6 and 7 are internally connected in shipping
product. For compatibility with future devices,
leave pin 6 floating.

Nominal Operating Temperature, T

Range E............................................ –40 to 85ºC

Overcurrent Transient Tolerance*, I

*

100 total pulses, 250 ms duration each, applied at a rate of

1 pulse every 100 seconds.

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage, VCC.......................................... 16 V

Reverse Supply Voltage, V
Output Voltage, V

........................................16 V

OUT

Reverse Output Voltage, V
Output Current Source, I
Output Current Sink, I

OUT(Sink)

Maximum Transient Sensed Current
Operating Temperature,
Maximum Junction, T
Storage Temperature, T

*

Junction Temperature, TJ < T

........................–16 V

RCC

......................–0.1 V

ROUT

OUT(Source)

.......................10 mA

....................... 165°C

J(max)

......................–65 to 170°C

S

.

J(max)

Pin 6: N.C.

Pin 5: GND

A

................ 60 A

P

................. 3 mA

*

, I

... 100 A

R(max)

ACS706ELC-05C

The Allegro ACS706 family of current sensors provides economical and
precise solutions for current sensing in industrial, automotive, 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 device consists of a precision, 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 signal to the
Hall transducer. A precise, proportional voltage is provided by the low-offset,
chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the
factory.

The output of the device has a positive slope (>V
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 resistance of this
conductive path is typically 1.5 mΩ, providing low power loss. The thickness
of the copper conductor allows survival of the device at up to 5× overcurrent
conditions. The terminals of the conductive path are electrically isolated from the
sensor leads (pins 5 through 8). This allows the ACS706 family of sensors to be
used in applications requiring electrical isolation without the use of opto-isolators
or other costly isolation techniques.

The ACS706 is provided in a small, 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 flip-chip uses high­temperature Pb-based solder balls, currently exempt from RoHS. The device is
fully calibrated prior to shipment from the factory.

Features and Benefits

• Small footprint, low-profile SOIC8 package

• 1.5 mΩ internal conductor resistance

• Excellent replacement for sense resistors

• 1600 V

• 4.5 to 5.5 V, single supply operation

• 50 kHz bandwidth

• 133 mV/A output sensitivity and 15 A dynamic range

• Output voltage proportional to ac and dc currents

• Factory-trimmed for accuracy

• Extremely stable output offset voltage

• Near-zero magnetic hysteresis

• Ratiometric output from supply voltage

minimum isolation voltage between pins 1-4 and 5-8

RMS

/ 2) when an increasing current

CC

TÜV America
Certificate Number:
U8V 04 12 54214 005

ACS706ELC05C-DS, Rev. 1

Use the following complete part number when ordering:

Part Number Package

ACS706ELC-05C SOIC8 surface mount

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

Pin 3 Pin 4

IP– IP–

ACS706ELC-05C

Functional Block Diagram

VCC
Pin 8

Voltage

Regulator

To all subcircuits

Cancellation

Dynamic Offset

Amp Out

Filter

VOUT

Pin 7

N.C.

Pin 6

+5 V

A

0.1 μF

IP+ IP+

Pin 1 Pin 2

Gain

A

Pins 6 and 7 are internally connected in shipping product.
For compatibility with future devices, leave pin 6 floating.

Temperature
Coefficient

Trim Control

GND
Pin 5

Offset

ACS706ELC05C-DS, Rev. 1

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

2

ACS706ELC-05C

OPERATING CHARACTERISTICS

Characteristic Symbol Test Conditions Min. Typ. Max. Units

ELECTRICAL CHARACTERISTICS, over operating ambient temperature range unless otherwise specified
Optimized Accuracy Range I
Linear Sensing Range I
Supply Voltage V
Supply Current I
Output Resistance R
Output Capacitance Load C
Output Resistive Load R
Primary Conductor Resistance R
RMS Isolation Voltage V
DC Isolation Voltage V

P

R

CC

VCC = 5.0 V, output open 5 8 10 mA

CC

OUTIOUT

LOAD

LOAD

PRIMARYTA

ISORMS

ISODC

VOUT to GND – – 10 nF
VOUT to GND 4.7 – – kΩ

Pins 1-4 and 5-8; 60 Hz, 1 minute 1600 2500 – V

= 1.2 mA – 1 2 Ω

= 25°C – 1.5 – mΩ

PERFORMANCE CHARACTERISTICS, over operating ambient temperature range, unless otherwise specified
Propagation Time t
Response Time t
Rise Time t

PROPIP

RESPONSEIP

r

Frequency Bandwidth f –3 dB, T

Sensitivity Sens

Noise V

Linearity E
Symmetry E
Zero Current Output Voltage V

Electrical Offset Voltage V

Magnetic Offset Error

Total Output Error

1

THERMAL CHARACTERISTICS

Junction-to-Lead Thermal
Resistance

Junction-to-Ambient Thermal
Resistance

1

Percentage of IP, with IP = 5 A. Output filtered. Up to a 2.0% shift in E

2

The Allegro evaluation board has 1500 mm2 of 2 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connect-

NOISE

LIN

SYM

OUT(Q)IP

OE

I

ERROMIP

E

TOT

2,3

, TA = –40°C to 125°C, VCC = 5 V unless otherwise specified

R

θJL

R

θJA

=±5 A, TA = 25°C – 3.15 – μs
=±5 A, TA = 25°C – 6 – μs

IP =±5 A, TA = 25°C – 7.45 – μs

= 25°C; IP is 10 A peak-to-peak; no external filter – 50 – kHz

A

Over full range of I
Over full range of I

, IP applied for 5 ms; TA = 25°C – 133 – mV/A

P

, IP applied for 5 ms 124 – 142 mV/A

P

Peak-to-peak, TA = 25°C, no external filter – 90 – mV
Root Mean Square, T

= 25°C, no external filter – 16 – mV

A

Over full range of IP , IP applied for 5 ms – ±1 ±4.7 %
Over full range of IP , IP applied for 5 ms 98 100 104.5 %

= 0 A, TA = 25°C – VCC / 2 – V
IP = 0 A, TA = 25°C –15 – 15 mV
IP = 0 A –65 – 65 mV

= 0 A, after excursion of 5 A – ±0.01 ±0.05 A
IP =±5 A , IP applied for 5 ms;TA = 25°C – ±1.5 – %
IP = ±5 A , IP applied for 5 ms – – ±12.5 %

Mounted on the Allegro ASEK 70x evaluation board; additional
information about reference boards and tests is available on the
Allegro Web site

Mounted on the Allegro ASEK 70x evaluation board; additional
information about reference boards and tests is available on the
Allegro Web site

may be observed at end-of-life for this device.

TOT

ing the layers. Performance values include the power consumed by the PWB. Further details on the board are available from the ACS704 Frequently
Asked Questions document on our website. Further information about board design and thermal performance also can be found on pages 16 and 17 of
this datasheet.

3

R

values shown in this table are typical values, measured on the Allegro evaluation board. The actual thermal performance depends on the board

θJA

design, the airflow in the system, and thermal interactions between the sensor and surrounding components through the PCB and the ambient air. To
improve thermal performance, see our applications material on the Allegro Web site.

–5 – 5 A

–15 – 15 A

4.5 5.0 5.5 V

– 5000 – V

– Value – Units

– 5 – °C/W

– 41 – °C/W

ACS706ELC05C-DS, Rev. 1

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

3

(mA)

CC

I

10.0

9.5

9.0

8.5

8.0

7.5

7.0

6.5

ACS706ELC-05C

Typical Performance Characteristics

Supply Current versus Ambient Temperature

V

= 5 V

CC

6.0

-50 -25 0 25 50 75 100 125 150

TA (°C)

Supply Current versus Applied V

8.50

8.45

8.40

8.35

8.30

8.25

(mA)

CC

8.20

I

8.15

8.10

8.05

8.00

4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5

V

(V)

CC

CC

ACS706ELC05C-DS, Rev. 1

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

4

4.0

3.5

ACS706ELC-05C

Output Voltage versus Primary Current

V

= 5 V

CC

3.0

(V)

2.5

OUT

V

2.0

1.5

1

1.0

-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9

IP (A)

°C

– 40
–

Sensitivity versus Primary Current

V

= 5 V

160

150

145

140

135

CC

20
25
85

125

°C

– 40
–

20
25
85

125

130

125

Sens (mV/A)

120

115

110

-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9

ACS706ELC05C-DS, Rev. 1

IP (A)

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

5

2.530

2.520

2.510

(V)

2.500

OUT(Q)

V

2.490

2.580

ACS706ELC-05C

Zero Current Output Voltage vs. Ambient Temperature

IP = 0 A

2.470

-50 -25 0 25 50 75 100 125 150

TA (°C)

Zero Current Output Currrent versus Ambient Temperature

(Data in above chart converted to amperes)

IP = 0 A

0.3

0.2

0.1

(A)

0

VOUT(Q)

I

–0.1

–0.2

ACS706ELC05C-DS, Rev. 1

–0.3

–50 –25 0 25 50 75 100 125 150

TA (°C)

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

6