A1205 Datasheet, PDF (1/12 Pages) Allegro MicroSystems – Continuous-Time Bipolar Switch

A1205
Continuous-Time Bipolar Switch
Features and Benefits
▪ Ideal for applications that require pulsing V_CC to
conserve power
▪ 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:
Description
The Allegro^® A1205 Hall-effect bipolar switch is a next-
generation replacement and extension of the popular Allegro
A3134 bipolar switch. The A1205 has identical specifications
as the A1201 but is recommended for applications that require
pulsing V_CC to conserve power. For standard applications,
where V_CC is constant, please refer to the A1201 through
A1204 devices.
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,
3 pin SOT23W (LH)
Not to scale
3 pin SIP (UA)
Continued on the next page…
Functional Block Diagram
VCC
A1205-DS, Rev. 1
Regulator
To all subcircuits
Amp
Gain
Offset
Trim
Control
VOUT
GND