LB1936V-TLM-E: Powering Precision in Portable Electronics with Advanced Bidirectional Control

The LB1936V-TLM-E from onsemi is a monolithic, low-voltage, low-saturation bidirectional motor driver IC engineered for high efficiency in battery-operated portable applications. This driver is specifically designed to control the speed and rotational direction of small DC motors or drive a stepper motor winding, making it an ideal solution for consumer electronics, computer peripherals, and small industrial automation equipment where extended battery life is a critical performance metric.

A key feature of the LB1936V-TLM-E is its remarkably low saturation voltage, typically as low as 0.5V (at Io=300mA). This characteristic is paramount for maximizing power efficiency. By minimizing the voltage drop across the output transistors, the IC reduces power dissipation as heat, ensuring more of the battery's energy is delivered directly to the motor. This results in stronger torque, faster response, and longer operational time between charges. The IC's ability to operate at a low supply voltage, starting from as low as 2.5V, further enhances its suitability for products running on two-cell NiMH, NiCd, or single-cell Li-ion batteries.

The device integrates a compact H-bridge configuration with all necessary control logic. It offers bidirectional control via two simple TTL/CMOS-compatible input pins (IN1 and IN2), which select forward, reverse, short brake, or stop (high impedance) modes. This simplifies interface with microcontrollers and reduces the external component count, saving valuable board space. An additional standby (STBY) control pin allows the system microcontroller to completely shut down the driver, reducing the supply current to nearly zero and contributing to ultra-low power consumption during idle states.

Built with robust operational capabilities, the IC includes integrated thermal shutdown (TSD) and overcurrent protection (ISD) circuits. These features automatically disable the output drivers if the chip's temperature or the output current exceeds safe limits, safeguarding both the driver IC and the connected motor from potential damage due to fault conditions.

ICGOOODFIND: The onsemi LB1936V-TLM-E stands out as an exceptionally efficient and compact solution for precise motor control in power-sensitive portable devices. Its combination of ultra-low saturation voltage, broad low-voltage operation, and integrated protection features makes it a superior choice for designers aiming to optimize performance and battery longevity.

Keywords:

Low-Saturation Voltage, Bidirectional Control, Low-Voltage Operation, Thermal Shutdown, H-Bridge Driver