ACS770xCB
Thermally Enhanced, Fully Integrated, Hall-Effect-Based
High-Precision Linear Current Sensor IC with 100 µΩ Current Conductor
DESCRIPTION
FEATURES AND BENEFITS
• Industry-leading total output accuracy achieved with new
piecewise linear digital temperature compensation of
offset and sensitivity
The Allegro™ ACS770 family of current sensor ICs provides
economicalandprecisesolutionsforACorDCcurrentsensing.
Typical applications include motor control, load detection and
management, power supply and DC-to-DC converter control,
inverter control, and overcurrent fault detection.
• Industry-leading noise performance through proprietary
amplifier and filter design techniques
• 120 kHz typical bandwidth
The device consists of a precision, low-offset linear Hall
circuit with a copper conduction path located near the die.
Applied current flowing through this copper conduction
path generates a magnetic field that is concentrated by a low
magnetic hysteresis core, then converted by the Hall IC into a
proportionalvoltage.Deviceaccuracyisoptimizedthroughthe
close proximity of the magnetic signal to the Hall transducer.
A precise, proportional output voltage is provided by the
low-offset, chopper-stabilized BiCMOS Hall IC, which is
programmed for accuracy at the factory. Proprietary digital
temperature compensation technology greatly improves the
IC accuracy and temperature stability without influencing the
high-bandwidth operation of the analog output.
• 4.1 µs output rise time in response to step input current
• Integrated shield greatly reduces capacitive coupling
from current conductor to die due to high dV/dt signals,
and prevents offset drift in high-side, high-voltage
applications
• Greatly improved total output error through digitally
programmed and compensated gain and offset over the
full operating temperature range
• Small package size, with easy mounting capability
• Monolithic Hall IC for high reliability
• Ultralow power loss:100 µΩ internal conductor
resistance
• Galvanic isolation allows use in economical, high-side
current sensing in high-voltage systems
High-level immunity to current conductor dV/dt and stray
electricfieldsisofferedbyAllegroproprietaryintegratedshield
technology for low output voltage ripple and low offset drift
in high-side, high-voltage applications.
• 4.5 to 5.5 V, single supply operation
• Output voltage proportional to AC or DC currents
• Factory-trimmed for accuracy
• Extremely stable output offset voltage
The output of the device has a positive slope (>VCC/2 for
bidirectional devices) when an increasing current flows
through the primary copper conduction path (from terminal 4
to terminal 5), which is the path used for current sampling. The
internal resistance of this conductive path is 100 µΩ typical,
providing low power loss.
Continued on the next page…
PACKAGE: 5-pin package (suffix CB)
The thickness of the copper conductor allows survival of the
device at high overcurrent conditions. The terminals of the
TÜV America
Certificate Number:
U8V 14 05 54214 028
PFF
PSF
Continued on the next page…
Leadform
Leadform
Additional leadforms available for qualifying volumes
5 V
1
VCC
4
5
IP+
CBYP
0.1 µF
Application 1: the ACS770 outputs an analog
signal, VOUT, that varies linearly with the
bidirectional AC or DC primary sampled cur-
rent, IP, within the range specified. RF and
CF are for optimal noise management, with
values that depend on the application.
ACS770
2
3
IP
GND
CF
IP–
VIOUT
VOUT
RF
Typical Application
ACS770-DS, Rev. 5
November 2, 2016
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