L9911

The L9911 is a high-performance, low-power dual H-bridge driver IC manufactured by STMicroelectronics, specifically designed for precise motor control in automotive and industrial applications. It integrates two independent half-bridge drivers capable of driving inductive loads such as DC motors, solenoids, or relays with currents up to 2 A per channel. The device features an integrated charge pump that enables high-side switching without requiring an external high-voltage supply, simplifying the overall system design. Key operational parameters include a wide supply voltage range from 4.5 V to 28 V, making it suitable for both 12 V and 24 V automotive systems. Each bridge supports current sensing through a dedicated output pin, allowing accurate monitoring of load current for over-current protection and closed-loop control implementations. The L9911 also includes built-in thermal shutdown and over-current protection mechanisms to enhance reliability under fault conditions. Designed for robust performance in harsh environments, the L9911 offers enhanced electromagnetic compatibility (EMC) through internal filtering and optimized layout considerations. Its logic inputs are compatible with standard CMOS and TTL levels, enabling seamless integration with microcontrollers and digital control circuits. Additionally, the chip includes a sleep mode that significantly reduces quiescent current consumption, supporting energy-efficient operation in battery-powered devices. This IC is commonly used in automotive applications such as power window regulators, seat adjusters, wiper motors, and HVAC actuators, where precise control, safety, and durability are critical. In industrial settings, it serves in robotics, automation equipment, and small conveyor systems where reliable bidirectional motor control is required. The L9911’s compact 16-pin SO16 package ensures easy mounting on PCBs while maintaining high thermal dissipation characteristics. Overall, the L9911 combines efficiency, protection features, and ease of integration, making it an ideal solution for engineers seeking a dependable and scalable motor driver for demanding applications.