A1202_16 Datasheet, PDF (1/13 Pages) Allegro MicroSystems – Continuous-Time Bipolar Switch Family

A1202 and A1203
Continuous-Time Bipolar Switch Family
FEATURES AND BENEFITS
• AEC-Q100 automotive qualified
• Continuous-time operation
□□Fast power-on time
□□Low noise
• Stable operation over full operating temperature range
• Reverse-battery protection
• Solid-state reliability
• Factory-programmed at end-of-line for optimum
performance
• Robust EMC performance
• High ESD rating
• Regulator stability without a bypass capacitor
Packages:
3-Pin SOT23W (suffix LH)
3-Pin SIP (suffix UA)
Not to scale
DESCRIPTION
The Allegro^™ A1202 and A1203 Hall-effect bipolar switches
are next-generation replacements and extension of the popular
Allegro A3133 andA3132 bipolar switch product line. Overall,
theA120x family, produced with BiCMOS technology, consists
of continuous-time devices that feature fast power-on time
and low-noise operation. Device programming is performed
after packaging, to ensure increased switchpoint accuracy
by eliminating offsets that can be induced by package stress.
Unique Hall element geometries and low-offset amplifiers
help to minimize noise and to reduce the residual offset
voltage normally caused by device overmolding, temperature
excursions, and thermal stress.
TheA120x Hall-effect bipolar switches include the following on
a single silicon chip: voltage regulator, Hall-voltage generator,
small-signal amplifier, Schmitt trigger, and NMOS output
transistor. The integrated voltage regulator permits operation
from 3.8 to 24 V. The extensive on-board protection circuitry
makes possible a ±30 V absolute maximum voltage rating for
superior protection in automotive and motor commutation
applications, without adding external components. All devices
in the family are identical, except for magnetic switchpoints.
The small geometries of the BiCMOS process allow these
devices to be provided in ultrasmall packages. The package
styles available provide magnetically optimized solutions for
most applications. Package LH is a SOT23W, a miniature low-
profile surface-mount package, while package UAis a three-lead
ultramini SIP for through-hole mounting. Each package is lead
(Pb) free, with 100% matte-tin-plated leadframes.
VCC
A1202-DS, Rev. 19
Regulator
To all subcircuits
Amp
VOUT
Gain
Offset
Trim
Control
GND
Functional Block Diagram