a4954 Allegro MicroSystems, Inc., a4954 Datasheet
a4954
Available stocks
Related parts for a4954
a4954 Summary of contents
Page 1
... DMOS PWM Motor Driver Description Designed for pulse width modulated (PWM) control of two DC motors, the A4954 is capable of peak output currents to ±2 A and operating voltages Input terminals are provided for use in controlling the speed and direction motor with externally applied PWM control signals ...
Page 2
... A4954 Selection Guide Part Number A4954ELPTR-T 4000 pieces per 13-in. reel A4954ELP-T 96 pieces per tube Absolute Maximum Ratings Characteristic Load Supply Voltage Logic Input Voltage Range V Input Voltage Range REF Sense Voltage (LSSx pin) Motor Outputs Voltage Output Current Peak Output Current ...
Page 3
... A4954 ELECTRICAL CHARACTERISTICS Characteristics General Load Supply Voltage Range R Sink + Source Total DS(on) Load Supply Current Body Diode Forward Voltage Logic Inputs Logic Input Voltage Range V Logic Input Current Logic Input Pull-Down Resistance R RR Input Hysteresis Timing Crossover Delay V Input Voltage Range ...
Page 4
... A4954 PWM Control Timing Diagram V IN1, IN3 V V IN2, IN4 V +I REG I –I , OUT1 OUT3 –I OUT2 OUT4 –I REG PWM Control Truth Table IN1, IN3 IN2, IN4 10× Note: Z indicates high impedance. Characteristic Performance ...
Page 5
... Low Power Standby mode disables most of the internal circuitry, including the charge pump and the regulator. When the A4954 is coming out of standby mode, the charge pump should be allowed to reach its regulated voltage (a maximum delay of 200 μs) before any PWM com- mands are issued to the device ...
Page 6
... A4954 Synchronous Rectification When a PWM off-cycle is triggered by an internal fixed off-time cycle, load current will recirculate. The A4954 synchronous rec- tification feature turns-on the appropriate DMOSFETs during the current decay, and effectively shorts out the body diodes with the low R driver. This significantly lowers power dissipation. ...
Page 7
... LSSx pin of ±500 mV at maximum load. During overcurrent events, this rating may be exceeded for short durations. Ground A star ground should be located as close to the A4954 as possible. The copper ground plane directly under the exposed thermal pad GND RS12 ...
Page 8
... A4954 5.00±0. NOM 16X 0.10 C 0.30 0.19 0.65 BSC Copyright ©2010-2011, 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’ ...