LED drivers offer up to 90 percent efficiency in backlighting applications
The ISL97682, ISL97683 and ISL97684 are compact 2-, 3-, 4-channel LED drivers that operate across an input voltage range of 4 V to 26.5 V and deliver outputs up to 45 V. The devices can also operate from inputs as low as 3V and deliver outputs up to 26.5 V in the bootstrap configuration, making them suitable for systems using single lithium-ion batteries.
The devices incorporate optional automatic switching between PWM and PFM modes, providing the best (up to 90%) power efficiency across the input voltage and output load range. All devices feature current accuracy of 1.5% and channel-to-channel current matching of 0.7%, providing uniform backlighting for 6-inch to 15-inch TFT LCD panels. The high performance and versatility of this product family also makes it suitable for industrial and automotive displays.
With a 3 V minimum supply voltage, no 5 V bias supply is required. Optional channel-to-channel phase shift control reduces video and audio noise interference. Channel-to-channel current matching within 0.7% assures uniform backlight brightness. Adjustable dimming frequency up to 30 kHz shifts ripple above the audio range, eliminating audible noise.The ISL97682/3/4 are available now in a 3-mm x 3-mm, 16-pin TQFN package and are priced at $1.35 each in 1,000-unit quantities.
For more information, visit www.intersil.com.
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