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A3290 Schematic ( PDF Datasheet ) - Allegro

Teilenummer A3290
Beschreibung Precision Hall-Effect Latches
Hersteller Allegro
Logo Allegro Logo 




Gesamt 10 Seiten
A3290 Datasheet, Funktion
A3290 and A3291
Chopper-Stabilized, Precision Hall-Effect Latches for
Consumer and Industrial Applications
FEATURES AND BENEFITS
• Symmetrical switchpoints
• Resistant to physical stress
• Superior temperature stability
• Output short-circuit protection
• Operation from unregulated supply
• Reverse battery protection
• Solid-state reliability
• Small package size
Packages:
3-Pin SOT23W
(suffix LH)
3-Pin SIP (suffix UA)
Not to scale
DESCRIPTION
The A3290 and A3291 Hall-effect latches are extremely
temperature-stable and stress-resistant sensor ICs, especially
suited for operation over extended temperature ranges (up
to 125°C). Superior high-temperature performance is made
possible through dynamic offset cancellation, which reduces
the residual offset voltage normally caused by device package
overmolding, temperature dependencies, and thermal stress.The
two devices are identical except for their magnetic switchpoints.
They are not intended for automotive applications.
Both devices include, on a single silicon chip, a voltage regulator,
a Hall voltage generator, a small-signal amplifier, chopper
stabilization, a Schmitt trigger, and a short-circuit protected
open-drain output to sink up to 25 mA.Asouth polarity magnetic
field of sufficient strength is required to turn the output on. A
north polarity field of sufficient strength is necessary to turn
the output off. An onboard regulator permits operation with
supply voltages in the range of 3 to 24 V.
Two package styles provide a magnetically optimized package
for most applications: type LH is a miniature SOT23W low-
profile surface-mount package, and type UA is a three-pin
ultramini SIP for through-hole mounting. Both packages are
lead (Pb) free with 100% matte-tin leadframe plating.
(A3290)
VCC
(A3291)
Amp
Regulator
Low-Pass
Filter
Control
Current Limit
OUT
1
GND
A3290-DS, Rev. 15
Functional Block Diagram






A3290 Datasheet, Funktion
A3290 and
A3291
Chopper-Stabilized, Precision Hall-Effect Latches
for Consumer and Industrial Applications
APPLICATION INFORMATION
It is strongly recommended that an external bypass capacitor be
connected (in close proximity to the Hall element) between the
supply and ground of the device to reduce both external noise
and noise generated by the chopper stabilization technique. This
configuration is shown in Figure 4.
The simplest form of magnet that will operate these devices is a
ring magnet. Other methods of operation, such as linear magnets,
are possible.
The device must be operated below the maximum junction tem-
perature of the device (TJ(max)). Under certain combinations of
peak conditions, reliable operation may require derating supplied
power or improving the heat dissipation properties of the applica-
tion. The Package Thermal Resistance (RθJA) is a figure of merit
summarizing the ability of the application and the device to dissi-
pate heat from the junction (die), through all paths to the ambient
air. Its primary component is the Effective Thermal Conductivity
(K) of the printed circuit board, including adjacent devices and
traces. Radiation from the die through the device case (RθJC) is
relatively small component of RθJA. Ambient air temperature
(TA) and air motion are significant external factors, damped by
overmolding. Sample power dissipation results are given in the
Thermal Characteristics section. Additional thermal data is also
available on the Allegro website.
Extensive applications information for Hall-effect devices is
available in: Hall-Effect IC Applications Guide, Application Note
27701 and Guidelines for Designing Subassemblies Using Hall-
Effect Devices, Application Note 27703.1
VCC
0.1 uF
VCC
A329x
VOUT
GND
Figure 4: Typical Basic Application Circuit
A bypass capacitor is highly recommended.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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