Details, datasheet, quote on part number: A4970
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| Part number | A4970 |
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| Title | Dual Full-Bridge PWM Motor Driver |
| Description | The A4970 motor driver drives both windings of a bipolar stepper motor or bidirectionally controls two DC motors. Both bridges are capable of sustaining 45 V and include internal pulse-width modulation (PWM) control of the output current to 750 mA.
For PWM current control, the maximum output current is determined by user selection of a reference voltage and sensing resistor. Two logic-level inputs select output current limits of 0%, 33%, 67%, or 100% of the maximum level. A PHASE input to each bridge determines load current direction.
Intrinsic diodes in the MOSFET output structure protect against inductive transients. Internally generated delays prevent crossover currents when switching current direction. Special power-up sequencing is not required. Thermal protection circuitry disables the outputs if the chip temperature exceeds safe operating limits.
The device is supplied in a 24-pin surface-mount wide SOIC with two pairs of batwing leads (LB). The webbed-pin construction provides for maximum package power dissipation in the smallest possible construction. The package is lead (Pb) free, with 100% matte tin leadframe plating. |
| Company | Allegro Micro Systems, Inc.
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| Datasheet | Download A4970 datasheet |
| Request For Quote | Find where to buy A4970 |
| Packages | A4970SLBTR-T |
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| Specifications, Features, Applications |
750 mA continuous output current 45 V output sustaining voltage Internal clamp diodes Internal PWM current control Low output saturation voltage Internal thermal shutdown circuitry Pin compatible with UDx2916 DMOS outputs
Description
The A4970 motor driver drives both windings of a bipolar stepper motor or bidirectionally controls two DC motors. Both bridges are capable of sustaining 45 V and include internal pulse-width modulation (PWM) control of the output current to 750 mA. For PWM current control, the maximum output current is determined by user selection of a reference voltage and sensing resistor. Two logic-level inputs select output current limits 100% of the maximum level. A PHASE input to each bridge determines load current direction. Intrinsic diodes in the MOSFET output structure protect against inductive transients. Internally generated delays prevent crossover currents when switching current direction. Special power-up sequencing is not required. Thermal protection circuitry disables the outputs if the chip temperature exceeds safe operating limits. The device is supplied a 24-pin surface-mount wide SOIC with two pairs of batwing leads (LB). The webbed-pin construction provides for maximum package power dissipation in the smallest possible construction. The package is lead (Pb) free, with 100% matte tin leadframe plating.
Part Number A4970GLBTR-T A4970SLBTR-T Package 24-pin batwing SOICW 24-pin batwing SOICW Packing 1000 per reel 1000 per reel Ambient Temperature (°C) to 85
Characteristic Motor Supply Voltage Logic Supply Voltage Input Voltage Reference Input Voltage Output Emitter Voltage Sense Voltage Symbol VBB VCC VIN VREF VE VSENSE Peak Output Current* IOUT Continuous Package Power Dissipation Operating Ambient Temperature Maximum Junction Temperature Storage Temperature PD TA TJ(max) Tstg See graph Range G Range S Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or TJ(max) I0x, I1x, PHASEx pins VREF pin Notes Rating to 150 Units W ºC
Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
*Measured on a single-layer board, with 1 sq. in. 2 oz copper area. For additional information, refer to the Allegro Web site.
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