The ISL78226 is a 6-phase, bidirectional, synchronous PWM controller designed to perform power conversion between 12V and 48V buses up to 3. 75kW at >95% conversion efficiency. One ISL78226 supports both Buck and Boost power conversion enabling a compact and robust design with minimum components. ISL78226 regulates both voltage and current to control power transfer from bus to bus. The multiphase architecture uses interleaved timing to support up to six parallel power stages per ISL78226. By interleaving the power stages, the ripple frequency is multiplied, reducing input and output ripple voltage and current. Lower ripple results in fewer input/output capacitors and therefore, lower component cost and smaller circuit implementation. The IC is designed to be interleaved in a master/slave architecture to be scaleable for higher power. Also integrated within the device is a dual-output Flyback controller that generates both a 12V supply for the power stage FET drivers as well as a 6V supply for the ISL78226 from either of the two buses. A 200mA auxiliary linear regulator is provided to supply a local microcontroller or interface devices. A PMBus interface provides system control and diagnostics to support functional safety requirements. This digital interface offers the system controller the ability to program operating modes, voltage and current limit warning, protection thresholds, individual fault response, and rapid fault condition detection.


  • 6-phase bidirectional synchronous 12V to 48V controller
  • Master/slave architecture supports up to 4 ICs in parallel
  • Voltage and current regulation
  • Phase dropping facilitated with companion FET driver
  • Average phase-to-phase current balancing
  • 2% current monitor gain accuracy from 0 to full load
  • Supply and clock redundancy for functional safety
  • Cycle-by-cycle peak current limiting
  • Cycle-by-cycle negative current limiting
  • Digitally programmable average current limit
  • Analog/digital control of output voltage
  • PMBus for status monitoring and fault response control
  • Selectable phase dropping and diode emulation for light-load efficiency improvement
  • Comprehensive protection with selectable hiccup or latch-off fault responses
  • Digitally programmable warning and fault thresholds
  • Dual-output Flyback controller
  • 200mA adjustable output linear regulator
  • 10mmx10mm 64 Ld TQFP with exposed pad thermal interface
  • AEC-Q100 Grade 1

tuneProduct Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active TQFP-EP Tray 160
Active TQFP-EP Reel 1000


Title language Type Format File Size Date
Datasheets & Errata
star ISL78226 Datasheet Datasheet PDF 6.21 MB
User Guides & Manuals
ISL78226EVKIT1Z, ISL78224EVKIT2Z Software User Guide Manual - Development Tools PDF 12.28 MB
Application Notes & White Papers
48V Board Net Reduces Vehicle CO2 Emissions and Improves Drivability White Paper PDF 866 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
ISL78226 Startup 48V 12V Boost iSim:PE Model Schematic SXSCH 716 KB
ISL78226 Startup iSim:PE Model Schematic SXSCH 716 KB
ISL78226 Tran 48V 12V Boost iSim:PE Model Schematic SXSCH 716 KB
ISL78226 Tran iSim:PE Model Schematic SXSCH 716 KB


Title language Type Format File Size Date
ISL78226EVAL1Z Software Installer Library EXE 2.72 MB
Register Directory for ISL78226 Library XLSX 55 KB
ISL78226EVAL1Z Design Files PCB Design Files ZIP 6.34 MB

select_allSoftware & Tool Pages

Title Type Description Company
iSim:PE Offline Simulation Tool Simulator iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs. Renesas

memoryBoards & Kits

Part Number Title Type Company
ISL78226EVKIT1Z 6-Phase 12V/48V Bidirectional Synchronous PWM Controller Evaluation Kit Evaluation Renesas