The A3941 from Allegro MicroSystems Europe is an H-bridge device which complements the company's existing line of automotive-grade MOSFET pre-driver ICs.
This device is designed around Allegro's latest generation of BCD semiconductor process technology and includes enhanced features which make it an ideal choice for high-temperature automotive systems and industrial systems using a 24 V battery supply. In particular, significant improvements have been made to the fault diagnostics, input logic flexibility and bootstrap charge management.
The A3941 is targeted at the requirements of the automotive market, which is looking to new technologies to replace belt-driven and hydraulic actuators with more efficient systems. Most belt-driven actuators provide a loss to system efficiency even when not in use. Eliminating this older technology is made possible by the adoption of full electronic systems utilising various electric motor technologies to replace the belt driven actuators, and the A3941 is designed to fit the emerging needs of this market.
The device is capable of driving four external N-channel MOSFETs in a full-bridge configuration. It is typically used in brush DC motor drive applications where high currents in combination with high ambient temperatures require the use of external MOSFETs. The A3941 is designed with high-temperature automotive applications in mind, and is rated over the full automotive temperature range (-40°C to +150°C junction temperature) and the full battery supply range of 7 V to 50 V.
An integrated charge pump provides full gate drive for battery voltages down to 7 V and reduced gate drive for battery voltages as low as 5.5 V. Flexible input logic can be configured to PWM (pulse-width modulation) on the high side or the low side, with seamless internal synchronous rectification logic operating on the high side or the low side depending on the PWM logic choice.
An adjustable drain-to-source monitor provides adjustable short-circuit protection for the external MOSFETs. Improved fault diagnostics offers an enhanced ability to decode and identify faults, and smart bootstrap capacitor management automatically monitors the bootstrap charge and generates a refresh pulse when required. Also included is a low-current 'sleep' mode and cross-conduction protection with adjustable dead time.
The A3941 is supplied in the 28-pin eTSSOP small profile thermally efficient package with exposed pad.
Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power integrated circuits and integrated Hall-effect magnetic sensors. Allegro's innovative solutions serve high-growth applications within the automotive, communications, computer/office automation, consumer and industrial markets. Allegro is headquartered in Worcester, Massachusetts (USA) with design and applications centres located in North and South America, Asia, and Europe. Further information about Allegro can be found at www.allegromicro.com
Allegro MicroSystems Europe, headquartered in Chertsey, United Kingdom, is the European sales and marketing operation, and operates a network of representatives and distributors throughout Europe. Allegro also has an engineering design centre in Edinburgh in Scotland and an application and marketing centre in Annecy in France.
Note: The above text is the public part of the press release obtained from the manufacturer (with minor modifications). EETimes Europe cannot be held responsible for the claims and statements made by the manufacturer. The text is intended as a supplement to the new product presentations in EETimes Europe magazine.
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