KTZ8868 High Efficiency 8-CH LED Backlight Driver with Dual LCD Bias Power
■KTZ8868 is the ideal power solution for LED backlighting and LCD bias power of medium size panels. It integrates two step-up converters for LED backlighting, a step-up converter with LDO and inverting charge pump for LCD bias power, resulting in a simpler and smaller solution with fewer external components. High switching frequency allows the use of smaller inductors and capacitors. Its input operating range is from 2.7V to 5.5V, accommodating 1-cell lithium-ion batteries or 5V supply.
■The LED driver has two step-up converters, and each converter drivers four current sinks with total eight current sinks. Each current sink can regulate up to 30mA with its maximum boost output voltage up to 40V. 11-bit linear or exponential ILED resolution can be obtained over I²C or PWM dimming. For additional flexibility, PWM dimming offers wide range frequency and duty cycle to support Content Adaptive Brightness Control (CABC).
■The LCD bias power section includes a step-up converter, LDO and an inverting charge pump to generate dual outputs, OUTP and OUTN, whose voltages can be programmed via an I²C interface. By integrating synchronous rectification MOSFETs for the step-up converter and charge pump, the KTZ8868 maximizes conversion efficiency up to 85%.
■Various protection features are built into KTZ8868, including inductor current limit protection, output short circuit protection, output over-voltage protection, LED fault (open or short) protection and thermal shutdown protection.
■KTZ8868 is equipped with I²C interface for various controls and status monitor.
■KTZ8868 is available in a RoHS and Green compliant WQFN55-32 (5mm x 5mm, 32 Lead).
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[ Tablet Backlight ][ LED backlighting ][ LCD bias ] |
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Datasheet |
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Please see the document for details |
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WQFN55-32;WQFN |
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English Chinese Chinese and English Japanese |
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December 2023 |
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Revision 04a |
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3.1 MB |
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