The ISL91211B is a 4‑phase, four-output programmable power management IC (PMIC). It is optimized with highly efficient synchronous buck converters capable of multiphase and single‑phase operation, delivering up to 5A per phase continuous output current. It features four buck controllers and can reconfigure its power stages to these controllers. This flexibility allows seamless design-in for a wide range of applications requiring high output power and a small solution size. ISL91211B integrates low ON-resistance MOSFETs and programmable PWM frequency, allowing the use of very small external inductors and capacitors. The device features automatic diode emulation and pulse skipping modes under light-load conditions to further improve efficiency and maximize battery life. The ISL91211B delivers a highly robust power solution by featuring a controller based on Renesas' proprietary R5 (Rapid Robust Ripple Regulator) 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, the ISL91211B also features four MPIOs and three GPIOs capable of supporting SPI and I²C communication protocols, and various other pin mode functions.