RENESAS ISL78224ANZ-T

ISL78224 is a 4-phase bidirectional synchronous PWM controller designed for power conversion between 12V and 48V buses, achieving greater than 95% conversion efficiency at up to 3kW. A single ISL78224 supports both buck and boost power conversion, enabling a compact yet powerful design with minimal components. The controller regulates voltage and current to manage power transfer between buses. The multiphase architecture employs interleaved timing, supporting up to four parallel power stages per ISL78224. By interleaving power stages, the ripple frequency is multiplied, reducing input and output ripple voltage and current. Lower ripple means fewer input/output capacitors are required, reducing component cost and board area. The IC is designed to be interleaved in a master/slave architecture for higher-power scaling. An integrated dual-output flyback controller generates a 12V supply for power stage FET drivers from either bus, as well as a 6V supply for the ISL78224. A 200mA auxiliary LDO powers a local microcontroller or interface device. The PMBus interface provides system control and diagnostic capabilities to meet functional safety requirements. This digital interface allows the system controller to program operating modes, voltage and current limit warnings and protection thresholds, individual fault responses, and fast fault condition detection.

• 4-phase bidirectional synchronous 12V to 48V controller
• Master/slave architecture supporting up to 4 ICs in parallel
• Voltage and current regulation
• Phase shedding with FET drivers
• 2% current sense gain accuracy from 0 to full load
• Power and clock redundancy for functional safety
• Cycle-by-cycle peak current limiting
• Cycle-by-cycle negative current limiting
• Digitally programmable average current limiting
• Analog and/or digital output voltage control
• Status monitoring and fault response control via PMBus
• Optional phase shedding and diode emulation for improved light-load efficiency
• Comprehensive protection with optional hiccup or latch-off fault response
• Digitally programmable warning and fault thresholds
• Dual-output flyback controller
• 200mA adjustable output linear regulator
• 10mm×10mm 64-pin TQFP package with exposed pad thermal interface
• AEC-Q100 Grade 1

• Automotive bidirectional DC/DC converter
• Smart grid bidirectional DC/DC converter
• Backup battery DC/DC converter