Overview: Data Sheet 29319.32 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 NO CONNECTION 1 NC LOGIC GROUND 2 VDD 24 LOGIC SUPPLY 23 PWM2 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. S10 3 OUT1A 4 22 S20 21 OUT2A Low rDS(on) DMOS output drivers provide low power dissipation during PWM operation. Internal charge pump circuitry is used to create LOAD SUPPLY1 5 VBB1 LOAD 20 VBB2 SUPPLY2 a boosted voltage to fully enhance the high-side DMOS switches. LOGIC LOGIC GROUND 6 GROUND 7
t SENSE1 8 c OUT1B 99 u S11 10 d PWM1 11 ro ly CP1 12 CHARGE PUMP 19 GROUND 18 GROUND 17 SENSE2 16 OUT2B 15 S21 14 VCP 13 CP2 Dwg. PP-069-2 d P On ABSOLUTE MAXIMUM RATINGS at TA = +25°C
e e Load Supply Voltage, VBB ................ 50 V u c Output Current, IOUT tin n Transient (<500 ns) ................... ±5 A
Logic Supply Voltage,
n re VDD ............................................ 7.0 V
Sense Voltage, VSENSE ...................... 0.5 V
o fe Logic Input Voltage Range, VIN .................. -0.3 V to VDD + 0.3 V
c e High-Side Gate Voltage ........... VBB + 8 V is Package Power Dissipation, R PD ............................................. 2.2 W D r Operating Temperature Range, o TA ............................. -20°C to +85°C F Junction Temperature, TJ ............. +150°C Three TTL-patible 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.
