ACS770xCB
Thermally Enhanced, Fully Integrated, Hall-Effect-Based
High-Precision Linear Current Sensor IC with 100 Current Conductor
DESCRIPTION
FEATURES AND BENEFITS
Industry-leading total output accuracy achieved with new The Allegro ACS770 family of current sensor ICs provides
piecewise linear digital temperature compensation of economical and precise solutions for AC or DC current sensing.
offset and sensitivity Typical applications include motor control, load detection and
Industry-leading noise performance through proprietary management, power supply and DC-to-DC converter control,
amplifier and filter design techniques inverter control, and overcurrent fault detection.
120 kHz typical bandwidth
The device consists of a precision, low-offset linear Hall
4.1 s output rise time in response to step input current
circuit with a copper conduction path located near the die.
Integrated shield greatly reduces capacitive coupling
Applied current flowing through this copper conduction
from current conductor to die due to high dV/dt signals,
path generates a magnetic field that is concentrated by a low
and prevents offset drift in high-side, high-voltage
magnetic hysteresis core, then converted by the Hall IC into a
applications
proportional voltage. Device accuracy is optimized through the
Greatly improved total output error through digitally
close proximity of the magnetic signal to the Hall transducer.
programmed and compensated gain and offset over the
A precise, proportional output voltage is provided by the
full operating temperature range
low-offset, chopper-stabilized BiCMOS Hall IC, which is
Small package size, with easy mounting capability
programmed for accuracy at the factory. Proprietary digital
Monolithic Hall IC for high reliability
temperature compensation technology greatly improves the
Ultralow power loss: 100 internal conductor
IC accuracy and temperature stability without influencing the
resistance
high-bandwidth operation of the analog output.
Galvanic isolation allows use in economical, high-side
current sensing in high-voltage systems High-level immunity to current conductor dV/dt and stray
4.5 to 5.5 V, single supply operation electric fields is offered by Allegro proprietary integrated shield
Output voltage proportional to AC or DC currents technology for low output voltage ripple and low offset drift
Factory-trimmed for accuracy in high-side, high-voltage applications.
Extremely stable output offset voltage
The output of the device has a positive slope (>V /2 for
CC
Continued on the next page
bidirectional devices) when an increasing current flows
through the primary copper conduction path (from terminal 4
PACKAGE: 5-pin package (suffix CB)
to terminal 5), which is the path used for current sampling. The
internal resistance of this conductive path is 100 typical,
providing low power loss.
Continued on the next page
TV America CB Certificate Number:
PFF PSF PSS
Certificate Number: US-29755-UL
Leadform Leadform Leadform U8V 14 05 54214 037
Additional leadforms available for qualifying volumes
5 V
1
4
VCC
IP+
C
Application 1: the ACS770 outputs an analog
BYP
signal, V , that varies linearly with the
OUT ACS770 0.1 F
bidirectional AC or DC primary sampled cur-
2
I GND
rent, I , within the range specified. R and
P F P
C are for optimal noise management, with
F
C
F
values that depend on the application.
5
IP
3
VIOUT
V
OUT
R
F
Typical Application
ACS770-DS, Rev. 11 May 28, 2019
MCO-0000205Thermally Enhanced, Fully Integrated, Hall-Effect-Based
ACS770xCB
High-Precision Linear Current Sensor IC with 100 Current Conductor
FEATURES AND BENEFITS (continued) DESCRIPTION (continued)
Undervoltage lockout for V below specification The thickness of the copper conductor allows survival of the device
CC
AEC-Q100 automotive qualified at high overcurrent conditions. The terminals of the conductive path
UL certified, File No. US-29755-UL are electrically isolated from the signal leads (pins 1 through 3). This
allows the ACS770 family of sensor ICs to be used in applications
requiring electrical isolation without the use of opto-isolators or
other costly isolation techniques.
The device is fully calibrated prior to shipment from the factory.
The ACS770 family is lead (Pb) free. All leads are plated with 100%
matte tin, and there is no Pb inside the package. The heavy gauge
leadframe is made of oxygen-free copper.
SELECTION GUIDE
Package Sensitivity
Primary Sampled
Current T
OP
[1] [2]
Sens (Typ.)
Part Number Current, I Packing
P
Directionality (C)
Terminals Signal Pins
(A)
(mV/A)
ACS770LCB-050B-PFF-T Formed Formed 50 40. Bidirectional
ACS770LCB-050U-PFF-T Formed Formed 50 80. Unidirectional
ACS770LCB-100B-PFF-T Formed Formed 100 20. Bidirectional
40 to 150
ACS770LCB-100B-PSS-T Straight Straight 100 20 Bidirectional
ACS770LCB-100U-PFF-T Formed Formed 100 40. Unidirectional
[3]
ACS770LCB-100U-PSF-T Straight Formed 100 40. Unidirectional
ACS770KCB-150B-PFF-T Formed Formed 150 13.3 Bidirectional
34 pieces
ACS770KCB-150B-PSF-T Straight Formed 150 13.3 Bidirectional
per tube
ACS770KCB-150B-PSS-T Straight Straight 150 13.3 Bidirectional 40 to 125
ACS770KCB-150U-PFF-T Formed Formed 150 26.7 Unidirectional
ACS770KCB-150U-PSF-T Straight Formed 150 26.7 Unidirectional
ACS770ECB-200B-PFF-T Formed Formed 200 10. Bidirectional
ACS770ECB-200B-PSF-T Straight Formed 200 10. Bidirectional
40 to 85
ACS770ECB-200U-PFF-T Formed Formed 200 20. Unidirectional
ACS770ECB-200U-PSF-T Straight Formed 200 20. Unidirectional
[1]
Additional leadform options available for qualified volumes.
[2]
Contact Allegro for additional packing options.
[3]
ACS770LCB-100U-PSF-T part variant is in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and no -
tice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because
of obsolescence in the near future. Samples are no longer available. Date of status change: June 5, 2017. Deadline for receipt of LAST TIME BUY orders: December 31,
2017. For existing customer transition, and for new customers or new applications, contact Allegro.
2
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com