Overview
The LB1668 Series are 2-phase unipolar drive brushless motor drivers that feature a wide usable voltage range and a minimal number of required external components. They also support the formation of motor lock protection and automatic recovery circuits.

Functions and Features
• Output protection Zener diodes with variable breakdown
   voltages
   — When the Z1 and Z2 pins are open: VOLM = 57 V
   — When the Z1 and Z2 pins are shorted: VOLM = 32 V
   — An external Zener diode can be connected between
      Z1 and VCC.
• Can support both 12-V and 24-V power supplies by
   changing an external resistor.
• Hall elements can be connected directly.
• 1.5-A output current output transistors built in
• Built-in rotation detection function that outputs low
   when driven and high when stopped (LB1668/M)
• FG signal function that sets FG high when IN- is low,
   and sets FG low when IN- is high (LB1667/M)
• Motor lock protection and automatic recovery functions
   built in
• Thermal shutdown function