Press Release Summary:
Dual DMOS full-bridge stepper motor driver ICs A4986/A4987 can be controlled in full-, half-, and quarter-step modes. Each full-bridge, controlled by PHASE, I0, I1 logic inputs, offers output rated up to 35 V and Â±2 A. Along with parallel input communication and overcurrent protection, features include 2-bit nonlinear DAC, synchronous rectification control circuitry, and fixed off-time PWM current regulator with mixed decay mode.
Original Press Release:
Allegro MicroSystems, Inc. Introduces New Dual Full-Bridge Motor Driver ICs with Overcurrent Protection
Improved Microstepping Accuracy for High Reliability Designs
Worcester, MA - Allegro MicroSystems, Inc. introduces two new motor driver ICs to complement their existing motor driver family. Allegro's A4986/A4987 devices are dual DMOS full-bridge stepper motor drivers with parallel input communication and overcurrent protection. Each full-bridge output is rated up to 35 V and ±2 A. These devices include a fixed off-time pulse width modulation (PWM) current regulator, along with a 2-bit nonlinear DAC (digital-to-analog converter) that allows stepper motors to be controlled in full, half, and quarter step modes.
The PWM current regulator uses the Allegro® patented mixed decay mode for reduced audible motor noise, increased step accuracy, and reduced power dissipation. Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Industry standard PHASE, I0, I1 logic inputs are used to control each full-bridge so these motor drivers can easily replace most existing drivers. The outputs are protected from shorts between motor leads and short-to-ground events, which protect the driver and associated circuitry from thermal damage or flare-ups. Other protection features include thermal shutdown with hysteresis, undervoltage lockout (UVLO), crossover current and over-current protection. Special power-up sequencing is not required.
Allegro's A4986 and A4987 are offered in several different package options: a 24 contact 4.0 mm × 4.0 mm × 0.75 mm QFN (ES) package, and a 24 lead 7.8 mm × 4.4 mm × 1.2 mm eTSSOP (LP) package. Both packages have exposed thermal pads for enhanced thermal dissipation, and are lead (PB) free with 100% matte tin plated lead frames. The A4986 device is priced at $1.68, the A4987 device is priced at $1.21 (ES package) and at $1.40 (LP package). All pricing is stated in quantities of 1,000.
Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power and Hall-effect sensor integrated circuits. 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 centers located in North and South America, Asia, and Europe. Further information about Allegro can be found at www.allegromicro.com.