The ISL97901CRZ is a highly efficient four-channel, 1.5A sequential LED driver powered from a single-cell Li-Ion battery or regulated input voltage up to 5.5V. It incorporates an independent current-controlled driving mechanism for each of the LEDs to allow accurate brightness control.This device also utilizes a buck-boost converter to ensure optimum output voltage for a wide variety of LED forward voltages. With a high level of integration and efficiency over 90%, the ISL97901CRZ supports a wide range of LED applications. The proprietary control algorithm provides seamless transitions and glitch-free operation between buck and boost modes, minimizing output current drops during mode changes.The ISL97901CRZ also provides I/O pins for interfacing with Renesas’ optical or general-purpose ICs, allowing color and white balance adjustment. It supports open/short LED fault detection and can operate in open-loop mode for fixed current control when real-time feedback is not required.