A1204 Datasheet | Continuous-Time Bipolar Switch Family





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Part Number A1204
Description Continuous-Time Bipolar Switch Family
Manufacture Allegro
Total Page 13 Pages
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Features: A1201, A1202, A1203, and A1204 Continuou s-Time Bipolar Switch Family Features and Benefits ▪ Continuous-time operat ion ▫ Fast power-on time ▫ Low nois e ▪ Stable operation over full operat ing temperature range ▪ Reverse batte ry protection ▪ Solid-state reliabili ty ▪ Factory-programmed at end-of-lin e for optimum performance ▪ Robust EM C performance ▪ High ESD rating ▪ R egulator stability without a bypass cap acitor Packages: 3 pin SOT23W (suffix L H), and 3 pin SIP (suffix UA) Descript ion The Allegro® A1201, A1202, A1203, and A1204 Hall-effect bipolar switches are next-generation replacements and ex tension of the popular Allegro A3134, A 3133, and A3132 bipolar switch product line. Overall, theA120x family, produce d with BiCMOS technology, consists of c ontinuous-time devices that feature fas t power-on time and low-noise operation . Device programming is performed after packaging, to ensure increased switchp oint accuracy by eliminating offsets that can be induced by package stress. Unique H.

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A1201, A1202, A1203, and A1204
Continuous-Time Bipolar Switch Family
Features and Benefits
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), and
3 pin SIP (suffix UA)
Description
The Allegro® A1201, A1202, A1203, and A1204 Hall-effect
bipolar switches are next-generation replacements and
extension of the popular Allegro A3134, A3133, and A3132
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
Not to scale
VCC
A1201-DS, Rev. 5
Continued on the next page…
Functional Block Diagram
Regulator
To all subcircuits
Amp
Gain
Offset
Trim
Control
VOUT
GND

                    
                 






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