Allegro APS11203 High-Voltage Switch for Automotive and Industrial Applications

Product Overview

The APS11203 is an integrated Hall-effect switch IC designed for automotive and industrial applications. It offers a wide operating voltage range and is AEC-Q100 qualified. The device features chopper stabilization for superior high-temperature performance and is available in a 3-pin SOT23-3 surface-mount package.

Features and Benefits

• 2.7 to 26 V operation
• AEC-Q100 qualified
• Omnipolar and unipolar switch threshold options
• High and low sensitivity magnetic switch-point options
• Choice of output polarity
• Chopper stabilization
• Low switch-point drift over temperature
• Insensitive to physical stress
• Open-drain output
• Solid-state reliability
• Industry-standard package and pinout
• Low jitter

Package

3-pin SOT23-3 (suffix MD)

(Diagram showing the 3-pin SOT23-3 package outline is not included as per instructions)

Applications

• Automotive: power closures, seatbelt buckles, break switch, headlight position, hood latch position, throttle and valve position, mirror position, etc.
• Industrial: smart meters, home appliances, position detection, e-mobility, etc.

Functional Description

The APS11203 is an integrated Hall-effect sensor IC with a switch output. The output is an open-drain configuration that actuates in response to a magnetic field applied to the branded package face. The devices are offered in a package with a 3-pin surface-mount configuration.

Operation Modes:

• Unipolar South Pole: Actuated by a south-polarity magnetic field exceeding the operate-point threshold (B_OPS). Output turns on (low) when threshold is met, and returns to original state when field is removed or reduced below the release point (B_RPS).
• Unipolar North Pole: Actuated by a north-polarity magnetic field exceeding the operate-point threshold (B_OPN). Output turns on (low) when threshold is met, and returns to original state when field is removed or reduced below the release point (B_RPN).
• Omnipolar: Actuated by either a north-polarity or a south-polarity field. The device operates using the standard output-polarity convention. Fields exceeding operating points turn the output on (low). When the magnetic field is removed or reduced below the release point (B_RPN or B_RPS), the output switches to the on state (low).

The difference between the magnetic operate and release points is the hysteresis (B_HYS). This built-in hysteresis allows for clean switching, even with external mechanical vibration and electrical noise.

(Diagram showing magnetic-sensing orientations is not included as per instructions)

Functional Block Diagram

(Diagram showing the functional block diagram is not included as per instructions)

The block diagram illustrates the internal components including the Hall Element, Amplifier, Regulator, Sample & Hold, Schmitt Trigger, Low-Pass Filter, and Current Limit, all controlled by a Clock/Logic unit.

Selection Guide

[1] For options not listed in the selection guide, contact Allegro MicroSystems.

[2] For additional packing options, contact Allegro MicroSystems.

Complete Part Number Format:

APS 11203 [Device Family] [Configuration Options] [Package Designation] [Ambient Operating Temperature Range]

Example: APS11203LMDALX-1PL0

Configuration Options:

• Output Polarity: H - High*, L - Low
• Operating Mode: P - Omnipolar, S - Unipolar South*, N - Unipolar North* (*Contact Allegro for availability)
• Device Switch Threshold: Options 1 through 9 correspond to different B_OP and B_RP values (e.g., Option 1: B_OP = 15 G; B_RP = 10 G).
• Instructions (Packing): LX - Tape and Reel, 10,000 pieces per 13-inch reel
• Package Designation: MDA - 3-pin SOT23-3 Surface Mount
• Ambient Operating Temperature Range: L - -40°C to 150°C, K - -40°C to 125°C

Electrical Characteristics

Valid over full operating voltage and ambient temperature ranges for T_J < T_J(max) and C_BYP = 0.1 µF, unless otherwise specified.

[1] Typical data is at T_A = 25°C and V_CC = 12 V unless otherwise noted.

[2] Not tested in final production. Guaranteed by device characterization and design.

Magnetic Switch Characteristics

Valid over full operating voltage and ambient temperature ranges for T_J < T_J(max) and C_BYP = 0.1 µF, unless otherwise specified.

Thermal Characteristics

May require derating at maximum conditions; see the Characteristic Performance section.

[1] Additional thermal information is available on the Allegro website.

ESD Characteristics

Device power consumption is extremely low. Under typical operating conditions, on-chip power dissipation is not an issue.

Characteristic Performance: Power Derating Curve

T_J(MAX) = 165 °C; I_CC = I_CC(MAX); I_OUT = 0 mA (Output Off)

(Graph showing Maximum Allowable V_CC (V) vs. Temperature (°C) for 2-layer and 4-layer PCBs is described textually below)

The graph illustrates the maximum allowable supply voltage (V_CC) as a function of temperature. Two curves are shown, representing a 2-layer PCB (309.2°C/W) and a 4-layer PCB (197.2°C/W). As temperature increases, the maximum allowable V_CC decreases for both PCB types. For the 2-layer PCB, V_CC decreases from approximately 26V at 25°C to about 16V at 165°C. For the 4-layer PCB, V_CC decreases from approximately 26V at 25°C to about 21V at 165°C.

Pinout Diagram and Terminal List

Package MD, 3-Pin SMD (SOT23-3) (View From Branded Face)

(Diagram showing the pinout is not included as per instructions)

Typical Application Circuit

(Diagram showing the typical application circuit is not included as per instructions)

The typical application circuit shows the APS11203 connected to VCC and GND, with an output (VOUT) connected through a load resistor (R_LOAD = 1 kΩ). A bypass capacitor (C_BYP = 0.1 µF) is connected between VCC and GND.

Chopper Stabilization

Chopper stabilization is a proven approach to minimize Hall offset, which is a limiting factor for switch-point accuracy. The Allegro technique, dynamic quadrature offset cancellation, removes key sources of output drift induced by temperature and package stress. This technique is based on a signal modulation-demodulation process.

The undesired offset signal is separated from the magnetically induced signal in the frequency domain through modulation. Subsequent demodulation acts as a modulation process for the offset, causing the magnetically induced signal to recover its original spectrum at baseband while the DC offset becomes a high-frequency signal. A low-pass filter then passes the signal while suppressing the modulated DC offset.

The innovative Allegro chopper-stabilization technique uses a high-frequency clock, allowing for a greater sampling rate, higher accuracy, reduced jitter, and faster signal processing. Filtering is more effective, resulting in a lower-noise analog signal. Devices using this approach, like the APS11203, have a stable quiescent Hall output voltage, are immune to thermal stress, and have precise recoverability after temperature cycling.

(Diagram showing the Model of Chopper Stabilization Circuit is not included as per instructions)

Package Outline Drawing

For Reference Only – Not for Tooling Use

(Reference Allegro DWG-0000930)

NOT TO SCALE

Dimensions in millimeters. Dimensions exclusive of mold flash, gate burrs, and dambar protrusions. Exact case and lead configuration at supplier discretion within limits shown.

(Diagram showing the package outline drawing is not included as per instructions)

Standard Branding Reference View

Revision History