Datasheet Intersil ISL97900 — Даташит

DATA SHORT
To request the full datasheet, please visit www.intersil.com/products/isl97900 ISL97900 FN8372
Rev 0.00
November 19, 2012 RGB Buck-Boost 3-Channel Color Sequencing LED Driver 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 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. 150mV feedback voltage reference for current regulation to
maximize efficiency 2.5MHz switching frequency Programmable output voltage and output current for each
LED Dynamic headroom management Internal current setting registers The ISL97900 architecture includes a 10-bit DAC, which
controls the LED currents. Each of the LED currents can be
programmed through serial interface. Ambient temperature range: 0В°C to +70В°C Pb-free (RoHS compliant) The ISL97900 also includes the Dynamic Headroom
Management function to provide seamless adjustment for the
LEDs’ voltages, which reduces power consumption. Applications 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 22ВµF 22ВµF 2.2ВµH C2 22ВµF 10ВµF C4 22ВµF C5 C6 1ВµF 10ВµF SDA …