3971 Datasheet (Allegro MicroSystems) - DUAL DMOS FULL-BRIDGE DRIVER

3971, DUAL DMOS FULL-BRIDGE DRIVER

No (Internal) connection Logic ground Control input, bridge 1 Output A, bridge 1 Load supply voltage, bridge 1 Ground Sense resistor, bridge 1 Output B, bridge 1 Control input, bridge 1 Control input, bridge 1 Charge-pump capacitor Charge-pump capacitor Reservoir capacitor Control input, bridge 2 Ou

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

3971 Features

* I ±2.5 A Load Current Capability per Bridge I Parallel Outputs for 5 A Load-Current Capability I Low rDS(on) Outputs Typically 325 mΩ source, 175 mΩ sink I Synchronous Rectification via Control Logic I Internal Undervoltage Monitor I Crossover-Current Protection I Source Connections for External Cur