Allegro MicroSystems A8904
The A8904 provides complete, reliable, self-contained back-EMF sensing, motor startup and running algorithms. The A8904 is fabricated in Allegro’s BCD (Bipolar CMOS DMOS) process, an advanced mixed-signal technology that combines bipolar, analog and digital CMOS, and DMOS power devices. The A8904SLB is provided in a 24-lead wide-body SOIC batwing package.
| Part No. |
A8904 |
| Datasheet |
A8904
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| Manufacturer |
 Allegro MicroSystems |
| Description |
3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER |
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ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage, VBB . . . . . . . . . . . . 15 V Output Current1, IOUT . . . . . . . . . . . . . . . . . . . . . ±1.4 A Peak Output Current (Brake)2, IOUT(BRK) . ±3.0 A Period2 for IOUT(BRK) to fall from ±3.0 A to ±1.4 A . . . . . . . . . . . . . . . 800 ms Logic Supply Voltage, VDD . . . . . . . . . . . 7.0 V Logic Input Voltage Range, VIN (continuous) . . . . . . -0.3 V to VDD + 0.3 V (tw <30 ns) . . . . . . . -1.0 V to VDD + 1.0 V Package Power Dissipation, PD . . See Graph Operating Temperature, TA . . . -20°C to +85°C Junction Temperature3, TJ . . . . . . . . . +150°C Storage Temperature,TS . . . . -55°C to +150°C 1Output FEATURES
Pin-for-pin replacement for A8902CLBA Startup commutation circuitry Sensorless commutation circuitry Option of external sector data tachometer signal Option of external speed control Oscillator operation up to 20 MHz Programmable overcurrent limit Transconductance gain options: 500 mA/V or 250 mA/...
