Overview
The LB1939T is a two-phase excitation bipolar stepping motor driver that features low voltage operation, a low saturation voltage, and low power consumption. It supports constant voltage and constant current drive, can control two iris motors, and is optimal for shutter, iris, and AF drive in 3 V battery operated still digital cameras and other battery operated equipment.

Features
• Low-voltage drive
    — Dual power supply operation: VS = 1.6 to 7.5 V, VDD = 1.9 to 6.5 V
    — Single power supply operation: VS = VDD = 1.9 to 7.5 V
• Low saturation voltage output: Vosat = 0.3 V at IO = 200 mA
• Supports constant voltage and constant current drive
• Built-in reference voltage circuit (Vref = 0.9 V)
• Miniature, thin form package (Thickness t = 1.1 mm)