A3290-1 Datasheet, PDF (1/10 Pages) Allegro MicroSystems – Chopper-Stabilized, Precision Hall-Effect Latches for Consumer and Industrial Applications

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
1Ω
GND
A3290-DS, Rev. 15
Functional Block Diagram