The LB1971V is a bipolar sensorless motor driver that provides a reverse torque braking function and is appropriate for use as the spindle motor driver in CD and MD players. Since the LB1971V can drive motors without the use of Hall elements, this device can contribute to miniaturization, thinner form factors, and lower power dissipation in end products.
The LB1971V is a bipolar sensorless three‑phase motor driver IC designed for spindle motors in CD and MD players. It offers reverse‑torque braking, soft‑switching drive, standby power‑saving and can operate from a 3 V supply. The document describes its functional blocks, pin assignments and typical application circuits.
Technical data include absolute maximum ratings, operating ranges, electrical characteristics, pin functions and example circuits. A block diagram and detailed pin‑function table help designers integrate the device, while notes on external components and oscillator design guide proper implementation.
| Maximum supply voltage (Vocimax) | 7.0 V |
|---|---|
| Maximum output current (Iomax) | 700 mA |
| Allowable power dissipation (Pdmax) | 0.4 W |
| Operating temperature range | -20 to +75 °C |
| Storage temperature range | -55 to +150 °C |
| Typical supply voltage range | 2.0 – 6.0 V |
| FG pin output current | 2.0 mA |
| Standby mode current drain | 5 pA |
The maximum supply voltage is 7.0 V.
It can output up to 700 mA of continuous current.
The STBY pin selects normal operation (high) or standby mode (low or open).