Description

are next generation replacements for the popular Allegro

312x and 314x lines of unipolar switches. The A110x family,

produced with BiCMOS technology, consists of 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.

The A1101-A1104 and A1106 Hall-effect 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 industrial motor commutation applications, without adding

A1101-DS, Rev. 1

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

Continuous-Time Switch Family

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Packages: 3 pin SOT23W (suffix LH), and

3 pin SIP (suffix UA)

Functional Block Diagram

Not to scale

A1101, A1102, A1103, A1104, and A1106

Amp

Regulator

GND

VCC

VOUT

Offset

Gain

Trim

Control

To all subcircuits