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)
■Features:
●Backlight LED Driver
◆Wide input range: 2.7V~5.5V
◆High efficiency step-up LED driver with 8-Ch current sinks, up to 40V boost voltage.
▲Up to 30mA/Ch in backlight mode
▲±0.7% current matching at 20mA
▲±2.2% current accuracy at 20mA
◆I²C/PWM dual dimming control scheme
▲High resolution I²C 11-bit linear or exponential dimming
▲Wide range PWM dimming.
▼100Hz to 100kHz frequency
▼0.2% to 100% duty cycle at 20kHz
◆Programmable current sink turn on/off ramp time/shape and transition ramp up/down time.
◆1.0MHz typical boost switching frequency
◆Programmable input PWM hysteresis to minimize jitter at low PWM duty cycle.
◆Programmable OVP and current limit
◆LED open/short protection
●LCD Panel Bias
◆Wide input range: 2.7V~5.5V
◆Programmable dual output Bias regulator using a single inductor.
◆Programmable ramp time for OUTP and OUTN
◆Charge pump PFM mode at light load
◆LCD Bias efficiency: up to 85%
◆Wide dual output voltage range ±4.0V to ±6.3V (50mV/step) and output current up to 250mA at VIN ≥ 2.9 V.
◆Active output discharge function
◆Current limit and short protection
●Others
◆System level input UVLO
◆Thermal shutdown protection
◆Low shutdown current <1μA
◆Flexible I²C interface
◆Pb-free Packages:
◆WQFN55-32 (5mm x 5mm, 32 Lead)
◆RoHS and Green Compliant
◆-40℃ to +85℃ Temperature Range
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[ Tablet Backlight ] |
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Datasheet |
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Please see the document for details |
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WQFN55-32 |
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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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3.2 MB |
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