A3959SB DMOS Full-Bridge PWM Motor Driver DIP24

Description

A3959SB DMOS Full-Bridge PWM Motor Driver DIP24

Overview

The A3959SB is a DMOS Full-Bridge PWM Motor Driver designed to control DC and bipolar stepper motors with PWM current control and integrated power MOSFETs. It’s useful for medium-power motor control applications where integrated logic, current decay mode selection, protection circuitry, and synchronous rectification are needed.

Key Electrical Characteristics

Output & Supply

• Supply Voltage (V_DD): 4.5 V to 5.5 V typical logic supply for control circuitry.

• Load Supply Voltage (V_BB): ~9.5 V to 50 V for motor power.

• Output Current Rating: ±3 A continuous (limited by package thermal) with ±6 A peak short bursts < 3 µs.

• Output MOSFET On-Resistance: ~270 mΩ typical.

Protection & Operational Modes

• Current Decay Modes: Mixed, Fast, and Slow decay selectable via inputs.

• Internal Protections:
  • Undervoltage lock-out (UVLO)
  • Thermal shutdown
  • Crossover-current (shoot-through) protection

• Synchronous Rectification: Reduced power dissipation during PWM off periods.

• Internal PWM Oscillator: Fixed off-time PWM timing control.

Logic Inputs / Controls

• PHASE: Motor direction control.

• ENABLE: Motor enable/disable.

• EXT MODE: Selects PWM control configuration.

• PFD1 / PFD2 & BLANK: Fast decay and blanking controls.

• REF & SENSE: Reference voltage and current sensing pins for current regulation.

• SLEEP: Low-power sleep mode control.

Operating Temperature

• Ambient Range: typically −20 °C to +85 °C.

• Junction Limit: approx. +150 °C max.

Package Details

• Package Type: 24-pin Through-Hole DIP with batwing ground tabs (suffix “B”).

• Ground Structure: Multiple ground pins (note special ground tie-requirements on DIP package).

• Suitable for prototyping and through-hole PCB designs.

Typical Applications

• DC motor speed and direction control

• Bipolar stepper motor drivers

• Robotics and automation systems

• Printers, scanners, and consumer devices

• Power tools and industrial actuator control

Summary