L9959S-D High-Side H-Bridge Driver IC – 3A Continuous Output with SPI Diagnosis for Engine & Throttle Control

The L9959S-D is a single integrated H-Bridge driver specifically designed to drive resistive and inductive loads in demanding automotive applications. This device combines a full H-bridge power stage with comprehensive supervision and diagnostic functions in a compact 24-pin HSSOP package with an exposed thermal pad for efficient heat dissipation .

This driver operates across a wide battery supply voltage range from 5V to 28V, making it suitable for various automotive electrical architectures . It delivers a continuous load current exceeding 3A, with a full path RDS(ON) of less than 540 mΩ to ensure efficient power delivery . The output switching frequency supports up to 11 kHz, enabling precise PWM control for motor speed and torque regulation .

The device features flexible control interfaces, allowing the power stages to be configured either via a standard SPI interface or through two dedicated input signals (PWM and DIR), with SPI programmability for configuration . Comprehensive diagnostic capabilities include over-temperature protection, short-circuit protection, and full diagnosis reporting through the SPI interface . An error history register stores fault events for system-level analysis .

Additional safety features include VDD supply voltage monitoring, two independent enable pins (/ABE and DIS) for fail-safe control, and a current-monitoring feedback output signal (CF) that provides real-time load current information . The device is logic-level 5V compatible and conforms to improved EMC requirements through smart H-Bridge switching techniques .

The L9959S-D is qualified for automotive applications and is ideally suited for throttle control actuators, exhaust gas recirculation (EGR) control valves, and other DC motor control applications in modern engine management systems .