**Introducing the A5990: Advanced Motor Driver from Allegro MicroSystems**
Worcester, MA – Allegro MicroSystems, LLC recently introduced the A5990, a cutting-edge four-way DMOS full-bridge driver IC designed to handle either two stepper motors or four DC motors simultaneously. Each motor can operate at a maximum output of 1.6A and withstand voltages up to 40V. The A5990 boasts an integrated fixed off-time pulse width modulation (PWM) current regulator, paired with a 2-bit nonlinear digital-to-analog converter (DAC). This combination enables precise control of stepper motors across full, half, and quarter steps. Alternatively, it allows DC motors to function in forward, reverse, and coast modes.
One of the standout features of the A5990 is its ability to achieve high-resolution microstepping control. This is made possible through independent current-controlled reference voltage inputs for each full bridge. The PWM current regulator includes an externally adjustable turn-off time, allowing for dynamic adjustment of current control based on the supply voltage and specific motor parameters. Additionally, each bridge pair can be individually fine-tuned for optimal performance.
The A5990 introduces an Adaptive Percent Fast Decay (APFD) option, which dynamically adjusts the fast decay portion of the turn-off time. This innovation enhances step accuracy while reducing current ripple and overall power consumption. Furthermore, users have the flexibility to configure the A5990 to employ Allegro's patented hybrid attenuation mode, featuring a fixed percentage fast decay of 30.1%.
Power efficiency is another highlight of the A5990, thanks to its internal synchronous rectification control circuit, which minimizes power loss during PWM operation. When idle, the device can transition into a low-current sleep mode to further reduce energy usage. Comprehensive protection features include thermal shutdown with hysteresis, undervoltage lockout (UVLO), overcurrent protection (OCP), and cross current protection—ensuring reliable operation without requiring any special power sequencing.
Packaged in a compact 6mm x 6mm 40-pin QFN format with a nominal height of 0.90mm, the A5990 is both Pb-free and equipped with a 100% matte tin-plated leadframe. Its primary target markets span dual-axis multi-motor systems, such as CCTV (pan-tilt-zoom controls), 3D printing, point-of-sale devices (receipt and lottery printers), office automation (printers and copiers), medical diagnostics, and industrial automation (ATMs and pick-and-place machinery).
For detailed pricing and additional technical specifications regarding the A5990, interested parties should reach out directly to Allegro Shanghai.
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**About Allegro MicroSystems, LLC**
Allegro MicroSystems, LLC stands as a pioneer in the design, manufacturing, and distribution of high-performance semiconductor solutions. Their products cater to a wide range of high-growth industries, including automotive, office automation, industrial applications, and consumer/communication sectors. Based in Worcester, Massachusetts, Allegro maintains global presence through strategic design, application, and sales support centers worldwide. Learn more about Allegro at http://CN.
This latest release underscores Allegro’s commitment to pushing the boundaries of motor control technology, offering solutions that balance precision, efficiency, and reliability across diverse industries.
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