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A3971 Datasheet DUAL DMOS FULL-BRIDGE DRIVER

Manufacturer: Allegro MicroSystems

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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.

Key Features

  • s ±2.5 A Load Current Capability per Bridge s Parallel Outputs for 5 A Load-Current Capability s Low rDS(on) Outputs Typically 325 mΩ source, 175 mΩ sink s Synchronous Rectification via Control Logic s Internal Undervoltage Monitor s Crossover-Current Protection Storage Temperature Range, s Source Connections for External Current Sensing TS -55°C to +150°C s Thermal Shutdown Circuitry Output duty cycle, ambient temperature, and heat sinking may limit current rating. Under any set of cond.

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