Semiconductors and Semiconductor Equipment
Company Overview of Allegro Microsystems, Inc.
Allegro Microsystems, Inc. develops, manufactures, and markets high-performance analog and mixed-signal semiconductors for automotive, appliance, lighting, consumer electronics, energy-efficient solutions, and industrial applications. It offers magnetic linear and angular position sensor integrated circuits (ICs); magnetic digital position sensor ICs, such as hall-effect latches and bipolar switches, hall-effect unipolar switches, dual element switches, and micropower switches and latches; and current sensor ICs, including integrated conductor sensor ICs, SIP package sensor ICs, integrated conductor sensor ICs, and high-side hot-swap hall effect based current monitor ICs. The company also of...
115 Northeast Cutoff
Worcester, MA 01615
Founded in 1990
Key Executives for Allegro Microsystems, Inc.
Vice President of Operations and Vice President of Quality
Vice President of Technology Development
Compensation as of Fiscal Year 2014.
Allegro Microsystems, Inc. Key Developments
Allegro Microsystems, Inc. Announces New Sensorless BLDC Controller
Dec 16 14
Allegro MicroSystems, LLC announced a new three-phase, sensorless, brushless DC (BLDC) motor controller for use with external complementary P channel and N-channel power MOSFETs. Reliable sensorless startup and run commutation can quickly be customized for individual motors and loads with adjustment of a few simple default parameters saving considerable design time. The A4963 fits a wide range of applications since the output current requirements can be scaled up or down with external MOSFET selection and it has a wide DC supply voltage range of 4.2 V to 50 V. This new motor controller is targeted at the consumer, industrial and white goods markets with end applications to include: pumps, blowers, power and garden tools, hair dryers, portable mixers, and airborne drones. The A4963 controls a motor using block commutation (trapezoidal drive) where phase commutation is determined, without the need for HALL position sensors, by monitoring the motor back- EMF (bemf). The sensorless start-up scheme allows the device to operate over a wide range of motor and load combinations including high or low inertial or friction loads. The A4963 can operate over a wide range of motor speeds, from less than 100 rpm to in excess of 30,000 rpm, depending on the supply voltage and motor capability. Several operational modes are available including closed loop speed control, duty-cycle (voltage) control, and current (torque limit) control. Operating mode and control parameters can be altered through an SPI compatible serial interface or through adjustable default settings preloaded into the on-chip EEPROM memory. Motor operation is through a single line, low frequency, PWM duty cycle control input. An open drain output is provided to report motor commutation frequency (TACHO) or electrical cycle frequency. Startup (inrush) current and peak motor current are limited by an integrated fixed off time PWM current limiter. Integrated diagnostics provide indication of under voltage, over temperature, lost synchronization, and power bridge faults and can protect the power switches under most short circuit conditions. Faults are indicated by a single open drain output. The A4963GLPTR-T is provided in a small, thermally enhanced 20-pin TSSOP with exposed thermal pad.
Allegro Microsystems Introduces New Precision Hall-Effect Angle Sensor ICs
Nov 18 14
Allegro MicroSystems, LLC introduced a new family of contactless Hall magnetic sensors with the debut of its A1332 and A1334 high resolution 360° angle sensor ICs. Based on magnetic Circular Vertical Hall (CVH) technology, the A1332 and A1334 devices, with their system-on-chip (SoC) architectures, provide fast output refresh rates and low signal path latency to support a wide variety of demanding automotive and industrial applications. Both devices are ideal for automotive applications such as electronic power steering (EPS), transmission, motor position, throttle/pedal position, and other systems that require accurate measurement of angles. The A1332, with an onboard 32-bit processor and EEPROM for factory and customer programmability, includes Segmented and Fourier linearization functions for supporting challenging off-axis/side-shaft magnetic sensing configurations that are commonly found in electronic power steering and transmission applications. The A1332 also supports on-axis/end-of-shaft magnetic sensing configurations and can produce high accuracy angle measurements at output refresh rates of 32 µs. The device sports a 2-wire I²C digital interface with signal path and I/O diagnostics for achieving higher ASIL safety reliability objectives. The A1334, with its onboard digital signal processing functions and EEPROM for factory and customer programmability, is designed specifically for on-axis/end-of-shaft applications that require ultra-fast output refresh rates and low signal path latency. Its 4-wire 10 MHz SPI interface offers a 25 µs output refresh rate and a nominal signal path latency of only 60 µs. In addition, the A1334 can operate directly off a vehicle battery, supporting a wide 4.5 V to 14.5 V supply voltage range, while consuming just 10 mA (max) of supply current. Like the A1332, the A1334 also includes signal path and I/O diagnostics for achieving higher ASIL safety requirements. Both devices can operate in a Low RPM mode, to support up to 12 bits of output resolution in lower angular velocity applications, and in a High RPM mode to support situations demanding faster refresh rates and lower single path latency. As part of their signal processing functions, the ICs include automotive grade temperature compensation to provide accurate angle measurements over the full operating temperature and voltage range of the devices. The A1332 and A1334 are also air gap independent over a wide magnetic field range and can operate over a 300 G to 1000 G magnetic target field level, thus making them less sensitive to stray fields and ensuring high levels of accuracy. Their on-chip EEPROM technology also enables flexible programming of end-of-line calibration parameters. The A1332 and A1334 operate over -40°C to 85°C and -40°C to 150°C temperature ranges, respectively, and are production available as a single die in a 1 mm thin 14-pin TSSOP (LE suffix) package. For ISO26262 ASIL D safety critical systems requiring sensor redundancy, the A1334 is also sampling in a dual die TSSOP-24 package, with production availability planned soon. All packages are lead (Pb) free with 100% matte-tin lead frame plating.
Allegro MicroSystems, LLC Introduces New Multi-Output Boost Converter Led Driver ICs with Fault Tolerant Protection
Oct 21 14
Allegro MicroSystems, LLC introduced two new devices to complement their existing portfolio of LED Driver ICs for LCD backlighting applications. Allegro’s A8518 and A8519 devices integrate a current-mode boost converter with internal power switch with either two current sinks (dual string) in their A8518 or four current sinks (quad string) in their A8519. Both devices are targeted at the automotive and industrial markets with end applications to include automotive infotainment and instrument cluster LCD backlighting, heads-up displays, interior lighting, accent lighting and robust commercial and industrial backlighting and lighting applications. In Allegro’s A8518, the boost converter can drive up to 22 white LEDs, 11 LED per string, at 200 mA. The LED sinks can be paralleled together to achieve higher LED currents up to 400 mA. In the A8519, the boost converter can drive up to 44 white LEDs, 11 LED per string, at 100 mA each. The LED sinks can be paralleled together to achieve higher LED currents up to 400 mA. Both devices contain features such as high dimming ratio, string current matching, frequency dithering and fault detection. Both devices also contain input current sensing and gate drive to control an optional input disconnect MOSFET. The A8518 and the A8519 are AEC-Q100 qualified and operate from a single power supply with a 4.5 V to 40 V range. This allows each part to withstand load dump and start-stop conditions encountered in automotive systems. Allegro’s A8518KLPTR-T is available in a 16-contact eTSSOP package (suffix LP) and the A8519KETTR-T is available in a 5 x 5 mm, 28-contact QFN (suffix ET) and a 20-contact eTSSOP package (suffix LP). All packages have an exposed pad for enhanced thermal performance.
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