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Datasheets:
A8904: 3-Phase Brushless DC Motor Controller/Driver with Back-EMF Sensing (PDF)
Selection Guides:
Power Integrated Circuits,
Power Motor Drivers,
Power Motor Drivers - Brushless DC
Product Evaluation Kits:
A8904SLP Product Evaluation Kit
The A8904 is a 3-phase brushless DC motor controller/driver designed for applications where accurate control of high-speed motors is required. The three half-bridge outputs are low on-resistance, N-channel DMOS devices capable of driving up to 1.2 A. The A8904 provides complete, reliable, self-contained back EMF sensing, motor start-up, and running algorithms. A programmable digital frequency-locked loop speed control circuit together with the linear current control circuitry provides precise motor speed regulation.
A serial port allows the user to program various features and modes of operation, such as the speed control parameters, start-up current limit, sleep mode, direction, and diagnostic modes.
The A8904 is fabricated in the Allegro® BCD (Bipolar CMOS DMOS) process, an advanced mixed-signal technology that combines bipolar, analog, and digital CMOS, with DMOS power devices.
The device is provided in a 24-pin wide-body SOIC package, with 4 internally-fused leads for enhanced thermal dissipation (package LB), and a thin (<1.2 mm overall height), 28-pin TSSOP package with an exposed thermal pad Package LP). Both packages are lead (Pb) free, with 100% matte tin leadframe plating.
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A8904SLB-T | 24-lead SOIC | Yes | view data | -20 °C to 85 °C | new | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A8904SLBTR-T | 24-lead SOIC | Yes | view data | -20 °C to 85 °C | new | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A8904SLP-T | 28-lead TSSOP | Yes | view data | -20 °C to 85 °C | new | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A8904SLPTR-T | 28-lead TSSOP | Yes | view data | -20 °C to 85 °C | new | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.