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