AS4950

AS4950 is a full-bridge DMOS brushed motor driver IC with a maximum operating range of ±3.5A and 40V input voltage, using PWM to control motor drive speed and direction. If both inputs are set low, the motor driver enters a low-power sleep mode. The AS4950 integrates a current limiting function based on the analog input VREF and the voltage at the LSEN pin. The device can limit the current to a known level, which significantly reduces system power requirements and eliminates the need for large bulk capacitors to maintain a stable voltage, especially during motor startup and stall. Internal shutdown functions include overcurrent protection, short-circuit protection, UVLO, and over-temperature protection. The AS4950 is offered in an SOP-8 package with an exposed pad for improved thermal dissipation, is lead-free, and features a leadframe with 100% matte tin plating.

Applications

• Printers and office automation equipment
• Electrical appliances
• Robotics
• Industrial equipment

Key features

• Wide supply voltage range, 8V - 40V
• RDS(ON) resistance: 600mΩ
• 3.5A peak drive output, 2A continuous output capability
• Under-voltage lockout protection
• Low-power sleep mode
• PWM current rectification / current limiting / direction control
• Short-circuit protection
• Over-temperature shutdown
• Automatic fault recovery