Buck-Boost Regulator Positive Output Step-Up/Step-Down I2C DC-DC Controller IC 40-VQFN (6x6)

The LM51772RHAR is a high-performance multi-phase bidirectional buck-boost controller designed for power conversion systems requiring efficient energy transfer between two voltage domains. The device supports seamless operation in both step-up and step-down modes and is optimized for battery-powered, automotive, industrial, and energy storage applications. The controller enables bidirectional current flow, making it suitable for battery charging, backup power systems, supercapacitor management, and high-power USB Type-C power delivery applications.

The device integrates advanced control architecture for high efficiency across a wide operating range while supporting programmable current regulation, voltage regulation, and protection features. Multi-phase capability allows reduced input and output ripple currents, improved thermal distribution, and higher overall power capability. The controller supports external MOSFETs for scalable power design flexibility and includes comprehensive monitoring and fault management functions.

The LM51772RHAR is designed for operation in demanding environments with robust protection features including overvoltage protection, undervoltage lockout, cycle-by-cycle current limiting, thermal shutdown, and fault reporting. Its flexible configuration and high integration level reduce external component count and simplify implementation in high-density power systems.

Key Features Bidirectional synchronous buck-boost controller architecture Supports power transfer in both forward and reverse directions Multi-phase operation for increased power capability and reduced ripple Wide input and output voltage operating range High-efficiency synchronous control using external MOSFETs Programmable current and voltage regulation Peak and average current control capability Seamless transition between buck, boost, and buck-boost operating modes Integrated current sensing support Programmable switching frequency synchronization Phase interleaving support for thermal and ripple optimization External clock synchronization capability Soft-start and controlled startup sequencing Comprehensive fault detection and protection functions Overcurrent protection and short-circuit protection Overvoltage and undervoltage protection Thermal shutdown protection Fault status reporting and system monitoring support Designed for automotive and industrial power applications Compact thermally enhanced package Typical Applications Bidirectional battery charging systems Energy storage systems Automotive dual-battery architectures USB Type-C Power Delivery systems Backup power and UPS systems Supercapacitor charging and balancing Industrial DC power conversion Renewable energy power management High-power portable electronics Telecom and server power systems Electrical Characteristics Wide operating supply voltage range High switching frequency operation capability High-current multi-phase scalability Precision current regulation accuracy Low standby power consumption High-efficiency synchronous rectification support Programmable dead-time and switching parameters Stable operation across wide temperature range Package Information Package Type: VQFN Package Suffix: RHA Thermally enhanced exposed pad package Surface-mount implementation Suitable for automated assembly processes

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