Southchip launched SC77870XQ series H-bridge motor driver IC. It integrates current monitoring and comprehensive diagnostic functions, delivers a maximum output current of 12A, and efficiently drives brushed motors and solenoid applications in 12V automotive systems. Its applications include thermal management systems, domain control, chassis, door control, and fuel vehicle valves. SC77870XQ is AEC-Q100 compliant, based on a fully domestic supply chain, and features an ultra-compact package and overcurrent capability, empowering customers to drive the advancement of next-generation body control systems.
High Integration, High-efficiency Drive
Market reports predict that the global automotive driver IC market will reach $3.853 billion by 2026, accounting for over 40% of the automotive power IC market. Classified by circuit topology, it includes high-side/low-side drivers, half-bridge drivers, and H-bridge drivers. In the driver IC field, Southchip has already introduced over 20 high-side drivers supporting different channel counts and rated currents, as well as 8-channel half-bridge driver SC77708Q, catering to various in-vehicle load scenarios. SC77870XQ adopts a H-bridge topology suitable for bidirectional current applications and can be configured as either a single H-bridge driver or two independent half-bridge drivers, significantly enhancing design flexibility and providing customers with more comprehensive and diverse options.
SC77870XQ comes in a 3mm*4.5mm FCQFN-14 or a 3mm*7.1mm eMMSOP-28 package, integrating four power MOSFETs in a single chip to significantly save PCB space in automotive applications. The chip offers two control interfaces: a 3.3V/5V compatible SPI interface and direct GPIO control. The SPI interface supports 16-bit data communication and rich diagnostic information readback, making it ideal for complex systems requiring precise control and status monitoring. The simple GPIO control meets the needs of applications with cost and response speed priorities.
Performance-wise, SC77870XQ supports a wide operating voltage range of 4.5V to 35V and a maximum output current of 12A, capable of handling various fluctuations and heavy-load demands in automotive power systems. Its on-resistance is as low as 84mΩ (QFN package) /98mΩ (SOP package), and the quiescent current in sleep mode is only 1μA, effectively reducing power loss and temperature rise. In software current-limited stall conditions (such as mirror/handle/charge port deicing functions), its transient thermal impedance outperforms competing products.
SC77870XQ provides an analog output proportional to the load current via the CS pin, enabling real-time high-precision current monitoring without an external shunt resistor. Actual test data shows monitoring accuracy reaches 3% when IOUT > 0.8A. For IOUT between 0.1A and 0.2A, accuracy remain within 10%, far surpassing the typical 50% accuracy of comparable products.
Comprehensive Protection and Diagnostic Features
SC77870XQ integrates extensive protection and diagnostic features, meeting the stringent safety requirements of body control systems.
Diagnostic functions include: open load and short circuit in OFF state, open load in ON state, SPI communication error, over current diagnostic, over temperature diagnostic, and VM overvoltage and undervoltage diagnostic, greatly enhancing system predictability and maintainability.
Protection mechanisms include: configurable over current protection, over temperature shutdown, and VM undervoltage lockout (UVLO) protection, building a comprehensive safety defense.
SC77870XQ also features excellent EMI performance. It supports PWM signals up to 25kHz with configurable output slew rates, ensuring smooth and efficient motor speed control under all conditions. Additionally, configurable output slew rate and spread spectrum clock effectively reduce electromagnetic interference and optimize electromagnetic compatibility.
