The ISL91211A is a 4-phase, three output programmable Power Management IC (PMIC) and the ISL91211B is a 4‑phase, four output programmable PMIC. They are optimized with highly efficient synchronous buck converters capable of multiphase and single‑phase operations that can deliver up to 5A per phase continuous output current. It features four buck controllers and has the capability to reconfigure its power stages to these controllers. This flexibility allows seamless design-in for a wide range of applications that require high output power and small solution size. ISL91211A and ISL91211B integrate low ON-resistance MOSFETs and programmable PWM frequency, allowing the use of very small external inductors and capacitors. They feature automatic Diode Emulation and Pulse Skipping modes under light-load conditions to further improve efficiency and maximize battery life. The ISL91211A and ISL91211B deliver a highly robust power solution by featuring a controller based on the Renesas proprietary R5 Technology that provides tight output accuracy and load regulation, ultra-fast transient response, seamless DCM/CCM transitions, and requires no external compensation. In addition to the standard interrupt, chip enable, and watchdog reset functions, ISL91211A and ISL91211B also feature four MPIOs and three GPIOs capable of supporting SPI, I2C communication protocol, and various other pin mode functions.


  • Triple output 2+1+1 phases (ISL91211A) or quad output single phase (ISL91211B)
  • 5V to 5.5V supply voltage
  • 5A per phase output current capability
  • Small solution size (for four phase design)
  • High efficiency (94.7% for 3.8VIN/1.8VOUT)
  • Low IQ in low power mode
  • Proprietary control scheme reduces output capacitor and supports fast load transient (such as 50A/µs per phase)
  • ±0.7% system accuracy, remote voltage sensing
  • Programmable PWM frequency from 2MHz to 6MHz
  • I2C programmable output from 0.3V to 2V
  • Independent Dynamic Voltage Scaling (DVS) for each output
  • Soft-start and fault detection (UV, OV, OC, OT), short‑circuit protection
  • 551mmx3.67mm 54 ball WLCSP with 0.4mm pin pitch


Title language Type Format File Size Date
star ISL91211A, ISL91211B Datasheet Datasheet PDF 3.13 MB
R16AN0006: Power Management Solution for Xilinx ZYNQ Ultrascale+ RFSoC Rev.1.00 Application Note PDF 293 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
TB500: Computing Power Reference Design Adaptation Guide Other PDF 351 KB
TB501: Computing Power Regulator Layout Checklist Other PDF 366 KB
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB


Title language Type Format File Size Date
Multiphase PMIC I2C Control Tool Rev C5 Software & Tools - Other ZIP 301.07 MB

memoryBoards & Kits

Part Number Title Type Company
ISL91211AII-EV1Z Triple Output Power Management IC Evaluation Board Evaluation Renesas