LB11946-E

Overview

The LB11946-E is a stepping motor driver IC implementing PWM current control bipolar drive with fixed off time. It features 15 current setting levels using a fixed VREF voltage and supports micro-stepping drive from 1-2 phase excitation to 4W1-2 phase excitation. The device includes logic input serial-parallel conversion, current attenuation switching (slow, fast, mixed decay), built-in diodes, simultaneous on prevention, noise cancellation, thermal shutdown, low voltage shutoff, and low-power mode control.

Feature Summary

• Implements PWM current control bipolar drive with fixed off time for precise motor regulation
• Supports micro-stepping drive modes ranging from 1-2 phase to 4W1-2 phase excitation
• Integrates current attenuation switching with selectable slow, fast, and mixed decay modes
• Includes protection features such as thermal shutdown, through-current prevention, and low voltage shutoff

Applications

• Printer carriage drive systems
• Printer paper feed mechanisms
• General purpose stepping motor control applications

Procurement Notes

Verify the specific suffix against official datasheets to confirm pinout and electrical characteristics match design requirements. Confirm availability status as distribution channels may list obsolete or end-of-life inventory. Ensure compatibility with existing logic voltage levels and thermal management solutions before finalizing procurement decisions.

Selection Notes

Select this component when designing systems requiring precise micro-stepping control for bipolar stepper motors. It is suitable for applications needing integrated current regulation and multiple decay modes. Consider its fixed VREF architecture for simplified external circuitry compared to programmable current drivers.

Part Context

This part belongs to the LB1194x series of stepping motor drivers originally developed by Sanyo Semicon Device and later acquired by onsemi. The series is designed for high-performance motor control in office automation equipment. The LB11946 variant specifically targets applications requiring flexible excitation modes and robust protection features.

Replacement Considerations

Check for direct equivalents within the LB1194x family or updated revisions from onsemi. Verify pin-to-pin compatibility if substituting with other manufacturers' stepping motor drivers offering similar PWM control and micro-stepping capabilities.