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.
Chief Executive Officer, President and Director
Chief Financial Officer, Principal Accounting Officer and Vice President
Vice President of Operations and Vice President of Quality
Executive Vice President, Director, Member of Nominating/Corporate Governance Committee and Member of Compensation Committee
Vice President of Technology Development
Compensation as of Fiscal Year 2014.
Allegro Microsystems, Inc. Key Developments
Allegro Microsystems, LLC Announces New Automotive High Current Led Controller
May 12 15
Allegro MicroSystems, LLC introduced a new DC-DC converter controller, providing a programmable constant current output for driving high power LEDs in series. Allegro’s A6271 controller is based on a programmable fixed frequency, peak current mode control architecture. The DC-DC converter can be configured in a myriad of different switching configurations including boost, buck-boost, SEPIC and buck (ground referenced switch). This new device is designed for automotive exterior lighting applications to include high power LED lighting systems, fog lights, reversing lights, daytime running lights (DRLs), position lights, and headlights. The A6271 provides a cost-effective solution using an external logic-level MOSFET and minimum additional external components. The maximum LED current is set with a single external sense resistor and can be accurately modulated using a current reference input (analog control). External PWM dimming is possible via the PWMIN input, which also provides a shutdown mode. As an alternative, an internal PWM dimming circuit can be used by programming the PWMIN and DR pins. Either PWM scheme controls the PWMOUT output which drives an external p-channel MOSFET connected in series with the LED string. This MOSFET is also used to isolate the load during certain fault conditions, including output shorts to ground. The A6271 has been carefully designed to minimize electromagnetic emissions through distributed decoupling and an externally programmable frequency dither circuit configured for the EMI specification CISPR 25. It is also possible to program the fundamental switching frequency below 150 kHz where most EMI standards begin. Allegro’s A6271 has a comprehensive set of integrated protection features to protect the IC, the LED driver system, and the LED string against faults. Fixed output over voltage protection ensures no maximum voltage rating violations even under a single point failure of the programmable output over voltage protection circuit. Other protection features include; LED over load (boost, SEPIC), output under voltage (buck or buck-boost), input supply (VIN) under voltage, 5 V Regulator (VREG) output under voltage, high side supply (PWM PMOS) under voltage, and thermal protection. The A6271KLPTR-T is available in a 16-pin eTSSOP (suffix LP) package with exposed thermal pad for enhanced power dissipation.
Allegro Microsystems Announces Two New Current Sensor ICs in a High Isolation Package
Apr 28 15
Allegro MicroSystems, LLC announced two new current sensor ICs that are economical and precise solutions for AC or DC current sensing in industrial and commercial systems. Allegro’s ACS722 and ACS723 are highly accurate devices that offer superior isolation performance, low power consumption, and a wide operating temperature range with near zero magnetic hysteresis in a surface mount package. The small package is ideal for space constrained applications while also saving costs due to reduced board area, yet provides a 4800 VRMS isolation rating, the high available from Allegro surface mount current sensor ICs. Typical applications include motor control, solar inverters, home automation and monitoring as well as those applications requiring reinforced isolation ranges. Allegro’s ACS722 and ACS723 consist of a precise, low-offset, linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic field to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which includes Allegro’s patented digital temperature compensation, resulting in extremely accurate performance over temperature. The output of the device has a positive slope when an increasing current flows through the primary copper conduction path (from pins 1 through 4, to pins 5 through 8), which is the path used for current sensing. The internal resistance of this conductive path is 0.85 mO typical, providing low power loss. The terminals of the conductive path are electrically isolated from the sensor leads (pins 9 through 16). This allows the current sensor ICs to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques. Both devices are provided in a low profile surface mount SOIC16 package. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. The devices are fully calibrated prior to shipment from the factory.
Allegro MicroSystems, LLC Announces New High Isolation, Linear Current Sensor ICs
Feb 24 15
Allegro MicroSystems, LLC announced two new current sensor ICs that are economical, high isolation solutions for AC or DC current sensing in industrial, commercial, and communications systems. Allegro's ACS717 and ACS718 devices have a very small package that is ideal for space constrained applications, though the widebody provides the creepage and clearance needed for high isolation. Typical applications include motor control, load detection and management, switchedmode power supplies, and overcurrent fault protection. Both devices consist of a lowoffset, linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic field to the Hall transducer. A proportional voltage is provided by the lowoffset, chopperstabilized BiCMOS Hall IC, which is programmed for accuracy after packaging. The output of the device has a positive slope when an increasing current flows through the primary copper conduction path (from pins 1 through 4, to pins 5 through 8), which is the path used for current sensing. The internal resistance of this conductive path is 0.85 m typical, providing low power loss. The terminals of the conductive path are electrically isolated from the sensor leads (pins 10 through 15). This allows the ACS717 and ACS718 current sensor ICs to be used in highside current sense applications without the use of highside differential amplifiers or other costly isolation techniques. Both devices are offered in a small, low profile surface mount SOICW16 package (suffix MA). The devices are leadfree with 100% matte tin leadframe plating and are fully calibrated prior to shipment from the factory.
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