Texas Instruments Synchronous Buck Chip Enhances Anti-Interference Capability of T-Box
With the rapid development of smart connected vehicles, the Telematics Box (T-Box) serves as a core hub for data interaction between vehicles and the cloud. Its stability directly impacts critical functions such as remote control, fault diagnosis, and OTA updates. Modern T-Box hardware typically adopts a "main MCU + communication module + storage unit + power management" architecture, where the power unit must provide stable supply under complex operating conditions such as vehicle start-stop and cold starts. Synchronous buck chips, with their high conversion efficiency (peak >95%), wide input voltage adaptability, and compact size, significantly outperform traditional linear voltage regulation solutions, making them an ideal choice for T-Box power design. Their high-frequency switching characteristics reduce the footprint of peripheral components while ensuring signal integrity for communication modules through low-noise output.In T-Box systems, synchronous buck chips supporting a wide input voltage range of 3V to 36V play a critical role. This voltage range perfectly covers the typical operating range of automotive batteries (e.g., 12V system nominal voltage and instantaneous low voltage during cold starts), allowing the chip to draw power directly from the front end without complex pre-regulation circuits. Its core advantage lies in efficiently handling load transients and voltage fluctuations, providing clean power to the T-Box's main MCU, 4G/5G communication modules, and GNSS positioning chips, thereby avoiding system resets caused by voltage anomalies. Additionally, its microsecond-level dynamic response capability significantly reduces power consumption, contributing to extended range for new energy vehicles.Texas Instruments' LM61440AANRJRR is an AEC-Q100-certified automotive-grade synchronous buck converter. It features a compact VQFN-14 package (3mm×3mm), supports a wide input voltage range of 3V to 36V, and delivers a continuous output current of 4A. The chip employs an adjustable switching frequency design (200kHz to 2.2MHz), allowing users to optimize efficiency and noise balance via external resistors, with peak efficiency exceeding 95%. It integrates a 55mΩ low-on-resistance MOSFET, significantly reducing switching losses, and includes built-in overcurrent, overtemperature, and undervoltage lockout protection mechanisms to ensure stable operation in environments ranging from -40°C to +125°C. In T-Box applications, its 2.2MHz high-frequency mode avoids interference with communication bands, while the Power Good (PG) signal and soft-start functionality further enhance system safety. As an authorized agent of Texas Instruments, MANDU provides full-cycle support to customers, including chip selection, circuit optimization, sample applications, and mass production assurance, helping customers shorten development cycles.For T-Box R&D engineers, Texas Instruments' synchronous buck chips, with their automotive-grade reliability, high integration, and flexible configurability, are an ideal choice for building high-performance power architectures. Their wide input voltage range and high conversion efficiency significantly enhance system stability, meeting the stringent requirements of smart connected vehicles for components. Through MANDU's localized technical services, engineers can quickly access reference designs and customized support, accelerating time to market.
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Shenzhen Mandu Technology Co., Ltd. has steadfastly centered its operations on the distribution of high-performance, high-quality, and highly reliable integrated circuit products. Its portfolio encompasses memory chips, differential crystal oscillators, and MCU microcontrollers, while progressively integrating analog signal chain products. The company prides itself on delivering comprehensive and cost-effective solutions to its customers. Its products find applications across a broad spectrum of industries, including but not limited to network communication, industrial control, robotics, medical equipment, personal health, and numerous other fields.
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