A3918 ALLEGRO [Allegro MicroSystems], A3918 Datasheet
A3918
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A3918 Summary of contents
Page 1
... The fault output does not affect driver operation. The A3918 is provided in a 16-contact × 3 mm, 0.75 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation lead (Pb) free, with 100% matte tin leadframe plating ...
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... A3918 Selection Guide Part Number A3918SESTR-T 1500 pieces per 7-in. reel Absolute Maximum Ratings Characteristic Symbol Load Supply Voltage V BB Logic Input Voltage Range V IN Sense Voltage V SENSE Output Current I OUT Operating Temperature Range T A Junction Temperature T J(max) Storage Temperature Range T stg ...
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... A3918 ELECTRICAL CHARACTERISTICS Characteristics Operating Voltage Range VBB Supply Current Output Resistance Current Trip Sense Voltage Clamp Diode Voltage Output Leakage Current Control Logic Logic Input Voltage Logic Input Current Input Hysteresis ¯ S ¯ ¯ L ¯ ¯ E ¯ ¯ E ¯ ¯ P ¯ Input ...
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... A3918 I LOAD Fault Asserted FL NOTE: Timer resets after each reset of the PWM latch. DC Motor Operation IN1 Low Voltage DC Motor Driver Fault Timing Diagram t Fault Asserted FL Control Logic IN2 OUTA OUTB Function 0 Off Off Disabled 0 High Low Forward 1 Low High ...
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... Device Operation The A3918 is a full-bridge low voltage motor driver capable of operating one high current DC motor. MOSFET output stages substantially reduce the voltage drop and the power dissipation of the outputs of the A3918, compared to typical drivers with bipolar transistors. Output current can be regulated by pulse width modulating (PWM) the inputs ...
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... A3918 External PWM If external PWM is used, the internal current control can either be disabled by shorting the SENSE pin to ground can be used to limit the peak current to a value under the stall current to prevent motor heating. External PWM of IN1/IN2 control is shown in the figure below. ...
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... For optimum electrical and thermal performance, the A3918 must be soldered directly onto the board. On the under- side of the A3918 package is an exposed pad, which provides a path for enhanced thermal dissipation. The thermal pad should be soldered directly to an exposed surface on the PCB. Thermal vias are used to transfer heat to other layers of the PCB ...
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... A3918 ES Package, 16-Contact QFN with Exposed Thermal Pad 17X 0.08 C +0.05 0.25 –0.07 0.40±0. Copyright ©2011-2012, Allegro MicroSystems, Inc. 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. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro’ ...