The LB1921 is a 3-phase brushless DC motor driver IC manufactured by SANYO Semiconductor (U.S.A) Corporation. It is designed for applications requiring precise speed control and high efficiency, such as fan motors and other small motor-driven devices.

Applications

• Fan motors (CPU coolers, case fans, etc.)
• Small brushless DC motors
• HDD spindle motors
• Optical disc drive motors

Features

• 3-phase full-wave drive
• Built-in Hall sensor amplifiers
• Speed control function
• Forward/reverse rotation control
• Overcurrent protection
• Thermal shutdown protection

Benefits

• Precise speed control
• High efficiency
• Low noise operation
• Compact design
• Reliable performance

Additional Details

The LB1921 uses a 3-phase full-wave drive scheme to ensure smooth and efficient motor operation. The built-in Hall sensor amplifiers simplify the external circuitry required. The speed control function allows for precise adjustment of the motor speed. The overcurrent and thermal shutdown protection features protect the IC and the motor from damage.

This motor driver IC is ideal for applications where precise speed control, high efficiency, and low noise are required. Its compact design and protection features make it a reliable and cost-effective solution.

Key Specifications:

• Supply Voltage: Consult datasheet for specific voltage range.
• Output Current: Consult datasheet for maximum output current.
• Control Input Voltage: Consult datasheet for logic level voltages.