Sharp Microelectronics of the Americas LED Drivers IR2E51Y6

The IR2E51Y6 is a white LED driver IC designed for applications such as cellular phones and PDAs. It features an integrated charge pump DC/DC converter that boosts input voltage and maintains high efficiency by automatically selecting between 1x and 1.5x charge pump modes based on input voltage and load conditions. The IC includes four drivers for main LCD backlighting, two for sub-LCD backlighting, and three RGB LED drivers, all connected in parallel. This driver supports an I¬=C-Bus interface and incorporates an ambient light sensor for automatic brightness adjustment, offering 16 steps and 128 gradation sequences for white LED brightness control. The maximum current per channel is 27.4mA, and it provides PWM control for RGB LEDs with a recommended frequency range of 2kHz to 5kHz. The device operates within a supply voltage range of 3.0V to 4.5V and includes features such as a power-on-reset circuit, soft-start limits for inrush current, and a stand-by circuit. The IR2E51Y6 is compliant with RoHS directives, making it suitable for environmentally conscious designs.