DATASHEET To request the full datasheet, please visit www.intersil.com/products/isl97900 RGB Buck-Boost 3-Channel Color Sequencing LED Driver ISL97900 Features The ISL97900 is a highly efficient 3-channel, 1.5A sequential LED driver powered from a single-cell Li-ion battery, or regulated input voltage up to 5.5V. This LED driver incorporates an independent current controlled driving mechanism for each of the LED's, which allows accurate current control of the LED brightness. • Buck-boost based LED driver • RGB color sequencing • Up to 1.5A output current • I2C Interface • 150mV feedback voltage reference for current regulation to maximize efficiency The ISL97900 utilizes a buck-boost converter to ensure that optimum output voltage is maintained for a wide range of LED forward voltages. The integrated buck-boost converter operates well over 90% efficiency across a wide range of operating conditions. The power conversion core implements a proprietary algorithm that allows seamless transitions and glitch-free operation between the buck and the boost modes as the battery voltage drops during operation. • 2.5MHz switching frequency • Programmable output voltage and output current for each LED • Dynamic headroom management • Internal current setting registers • Ambient temperature range: 0°C to +70°C The ISL97900 architecture includes a 10-bit DAC, which controls the LED currents. Each of the LED currents can be programmed through serial interface. • Pb-free (RoHS compliant) Applications The ISL97900 also includes the Dynamic Headroom Management function to provide seamless adjustment for the LEDs’ voltages, which reduces power consumption. • LED-based pico projector in mobile phones • Stand-alone pico projectors • Tri-stimulus display drivers • Other handheld display drivers L2 C3 C11 C1 1 PVIN 22µF 22µF 2.2µH C2 22µF 10µF C4 22µF C5 C6 1µF 10µF SDA CEN 3 SCL 4 SDA LED2 20 THERMAL PAD (GND) LED3 19 NC 18 6 VCC R1 0.1 14 EN1 12 EN3 9 13 EN2 FB 16 SGND 15 NC LCoS DRIVER ASIC CBYP 8 SGND 7 11 GND 1µF 0.1µF NC 17 10 NC C7 LED3 LED1 21 5 CEN C10 LED2 VOUT VOUT 22 2 ADDR SCL LED1 24 23 LX2 PGND 25 27 PGND 26 28 LX1 BATT 2.8V TO 4.3V PVIN 1.8V SGND EN3 EN2 EN1 FIGURE 1. TYPICAL APPLICATION November 19, 2012 FN8372.0 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2012. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. ISL97900 For additional products, see www.intersil.com/product_tree Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted in the quality certifications found at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets 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 Submit Document Feedback 2 FN8372.0 November 19, 2012