3971

3971 ADVANCE INFORMATION (Subject to change without notice) May 2, 2000 DUAL DMOS FULL-BRIDGE DRIVER Designed to interface between external PWM control logic and inductive loads such as relays, solenoids, dc motors, or stepper motors, each full bridge can operate with output currents to ±2.5 A and operating voltages to 50 V. Low rDS(on) DMOS output drivers provide low power dissipation during PWM operation. Internal charge pump circuitry is used to create a boosted voltage to fully enhance the high-side DMOS switches. Three TTL-compatible logic-input terminals per bridge allow flexibility in configuring PWM control. Internal circuit protection includes thermal shutdown with hysteresis, and crossover-current protection. Special power -up sequencing is not required. The A3971SLB is supplied in a 24-lead plastic SOIC with a copper batwing tab. The power tab is at ground potential and needs no electrical isolation. Data Sheet 29319.32 NO CONNECTION LOGIC GROUND S10 OUT1A LOAD SUPPLY1 GROUND GROUND SENSE1 OUT1B S11 PWM1 CP1 1 2 3 4 5 6 7 8 9 9 10 11 12 NC VDD 24 23 22 21 20 19 18 17 16 15 14 LOGIC SUPPLY PWM2 S20 OUT2A LOAD SUPPLY2 GROUND GROUND SENSE2 OUT2B S21 VCP CP2 VBB1 VBB2 LOGIC LOGIC CHARGE PUMP 13 Dwg. PP-069-2 ABSOLUTE MAXIMUM RATINGS at TA = +25°C Load Supply Voltage, VBB ................ 50 V Output Current, IOUT Transient (