Overview
The LB1913 is a three-phase disk drive motor driver IC that is optimal for use as a 3.5-inch floppy disk drive spindle motor driver.

Functions and Features
• Three-phase full-wave linear drive
• On-chip digital speed control
• Start and stop circuits (active low)
• Speed switching
    High: 300 rpm, Low: 360 rpm
• Current limiter circuit
• Index comparator circuit
• Index delay circuit
• Thermal protection circuit