ABSOLUTE MAXIMUM RATINGS
at TA = +25°C Load Supply Voltage, VBB ................ 35 V Output Current, IOUT ...................... ±1.0 A Logic Supply Voltage, VDD .............. 7.0 V Logic Input Voltage Range, VIN ................ -0.3 V to VDD + 0.3 V Reference Voltage, VREF ..................... 3 V Sense Voltage (dc), VS ................ 500 mV Package Power Dissipation, PD A3973SB ............................... 3.1 W A3973SLB ............................ 2.2 W Operating Temperature Range, TA .......................... -20°C to +85°C Junction Temperature, TJ ............. +150°C Storage Temperature Range, TS ......................... -55°C to +150°C 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 a junction temperature of 150°C. Designed for pulse-width modulated (PWM) current control of bipolar microstepping stepper motors, Internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes.
Allegro MicroSystems
