A3903 Allegro MicroSystems, Inc., A3903 Datasheet
A3903
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A3903 Summary of contents
Page 1
... PWM of the sink drivers. Internal protection circuitry includes thermal shutdown, undervoltage lockout, and crossover current (shoot-through) protection. The A3903 is supplied mm, 0.55 mm nominal height, 8-lead DFN package, with exposed thermal pad (package suffix EE). This small footprint package is lead (Pb) free, with 100% matte tin leadframe plating ...
Page 2
... A3903 Part Number A3903EEETR-T Parameter Supply Voltage Logic Input Voltage Range Output Current Junction Temperature Storage Temperature Range Operating Temperature Range Low Voltage DC Motor Driver Selection Guide Packing Tape and reel, 3000 pieces/reel Absolute Maximum Ratings Symbol Conditions OUT ...
Page 3
... A3903 VREF R1 VSET R2 IN1 IN2 Number Low Voltage DC Motor Driver Functional Block Diagram VBG CHARGE PUMP 3R OUTA OUTB R Sink Drive Control Logic Terminal Diagram OUTB 1 8 IN2 GND 2 7 IN1 VDD 3 6 VREF OUTA 4 5 VSET (Top View) ...
Page 4
... A3903 ELECTRICAL CHARACTERISTICS at T Characteristics Supply Current UVLO Enable Threshold UVLO Hysteresis Thermal Shutdown Temperature Thermal Shutdown Hysteresis Logic Input Low Level Logic Input High Level Input Hysteresis Logic Input Current Output Driver Sink Driver Output Resistance Source Driver On Resistance Bandgap Reference ...
Page 5
... The voltage drop across these switches will vary linearly with tempera- ture and current, therefore the voltage across the motor coil also will vary. The A3903 will eliminate these sources of error for a system where controlling the motor voltage is the optimum means of control. ...
Page 6
... The printed circuit board should use a heavy ground- plane for optimum thermal performance. The A3903 must be soldered directly onto the board. On the underside of the A3903 package is an exposed pad, which provides a path for enhanced thermal dissipa- tion. The thermal pad should be soldered directly to an exposed surface on the PCB ...
Page 7
... Bulk capacitance is often located at a non-ideal distance from the device. If the recommended capacitance of 10 μF cannot be located very close to the supply ter- minal on the A3903 recommended that a 0.1 μF capacitor be placed as close to the VDD terminal as possible to provide transient currents. PWM Operation In some applications current control may be desired ...
Page 8
... A3903 D 0. 0.25 0.325 Copyright ©2007, Allegro MicroSystems, Inc. The products described here are manufactured under one or more U.S. patents or U.S. patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec tions as may be required to per- mit improvements in the per for mance, reliability, or manufacturability of its products ...