DATA SHORT To request the full datasheet, please visit www.intersil.com/products/isl97901 ISL97901 FN7824 RGB Buck-Boost Four-Channel LED Driver with Color Sequencing and Automatic Rev 0.00 White Balance June 29, 2012 The ISL97901 is a highly efficient four channel, 1.5A Features sequential LED driver powered from a single-cell Li-ion battery, or regulated input voltage up to 5.5V. The ISL97901 • Buck-Boost Based LED Driver incorporates an independent current controlled driving • RGB, RGGB or RGBW Color Sequencing mechanism for each of the LED's to allow accurate brightness • Up to 1.5A Output Current control. • Photo Detector Feedback Interface The ISL97901 also utilizes a buck-boost converter to ensure • Dual Green LED Drive Support optimum output voltage is maintained for a wide variety of LED forward voltages. The ISL97901's highly integrated and • Closed-Loop White Balancing Dynamic Current Scaling efficient power conversion core operates at well over 90% • Standby Current less than 70µA efficiency across a wide range of operating conditions. The power conversion core implements a proprietary algorithm • I2C Interface that allows seamless transitions and glitch-free operation • 150mV Feedback Voltage Reference for Current Regulation between the buck and the boost modes as the battery voltage to Maximize Efficiency drops during operation. • 2.5MHz Switching Frequency The ISL97901 provides I/O pins to interface with Intersil's • Programmable Output Voltage for each LED optical sensor IC's for white balance control. White balance is • Dynamic Headroom Management achieved by closing the opto-electrical loop which allows for LED light output to get calibrated against preset target values. • Internal Current Setting Registers The ISL97901 can also be configured to run in an open-loop • Ambient Temperature Range: 0°C to +70°C manner if real-time white balance control is not desired. In this case, the LED currents are set by the internal registers. • Pb-Free (RoHS Compliant) Related Literature Applications •ISL58333 “Wide Optical Spectrum Photo Sensor IC” • LED-Based Pico Projector In Mobile Phones •ISL58344 “Quad Segment Photo Sensor IC” • Stand Alone Pico Projectors • Tri-Stimulus Display Drivers • Other Handheld Display Drivers X1 2.2µH X2 L L VIN VOUT ED1 ED2 ED3 ED4 VIN VOUT L L L L C1 20-40µF Batt 2.7V TO 4.3V C3 VCC PGND 47Cµ2F 1.0µF ENABLE CEN D1 DISABLE D2 EN1 D3 WHITE LCoS OR DLP EN2 D4 O2nRd DRIVER ASIC EN3 ISL97901 FB1 GREEN EN4 FB2 RSNS CBYP RSNS 0.1 C4 SGND 0.1 0.1µF PGND SDA SDA SCL LFBP SCL SENSOR LFBN ADDR PHOTO DETECTOR ISL58333 FIGURE 1. TYPICAL APPLICATION FN7824 Rev 0.00 Page 1 of 2 June 29, 2012

ISL97901 © Copyright Intersil Americas LLC 2012. All Rights Reserved. All trademarks and registered trademarks are the property of their respective owners. For additional products, see www.intersil.com/en/products.html Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted in the quality certifications found at www.intersil.com/en/support/qualandreliability.html Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com FN7824 Rev 0.00 Page 2 of 2 June 29, 2012

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