• Product introduction

ISL97901

RGB buck-boost quad LED driver with color sequencing and automatic white balance

Key features

• Buck - Boost LED driver
• RGB, RGGB or RGBW color sequencing
• Up to 1.5A output current
• Light detector feedback interface
• Dual green LED driver support
• White balance dynamic closed-loop current scaling
• The standby current is less than 70μA
• I²C interface
• The 150mV feedback voltage reference current is regulated to maximize efficiency
• 2.5MHz switching frequency
• Programmable output voltage for each LED
• Dynamic margin management
• Internal current setting register
• Ambient temperature range: 0°C to +70°C
• Pb-free (RoHS compliant)

description

The ISL97901 is a highly efficient quad 1.5A continuous LED driver powered by a single-cell Li-Ion battery or regulated input voltage up to 5.5V. The ISL97901 uses an independent current control type to drive each LED that allows precise brightness control.

The ISL97901 also uses a buck-boost converter to ensure that the optimal output voltage is maintained at a wide range of LED forward voltages. The ISL97901's highly integrated and efficient power conversion core business is more than 90% efficient over a wide range of operating conditions. The power conversion core implements a proprietary algorithm that allows seamless transition between buck and boost modes and interference-free operation during operation when the battery voltage drops during operation.

The ISL97901 provides an I/O pin interface with Intersil's optical sensor ICs for white balance control. White balance is pre-set by closing the photoelectric circuit, which allows the light output of the LED to get calibrated to a preset target. If real-time white balance control is not desired, the ISL97901 can also be configured to run in open-loop mode. In this case, the current of the LED is set by internal registers.

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• LED based pico projector in mobile phone
• Stand-alone pico projector
• Three primary colors show the driver
• Display drivers for other handheld devices