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Kinetic Technologies KTZ8868 High Efficiency 8-Ch LED Backlight Driver

Kinetic Technologies KTZ8868 High Efficiency 8-Ch LED Backlight Driver offers an ideal power solution for LED backlighting and an LCD bias power for medium-size panels. The KTZ8868 backlight driver integrates two step-up converters for LED backlighting, a step-up converter with LDO, and an inverting charge pump for LCD bias power. This integration results in a simpler and smaller solution with fewer external components. The KTZ8868 high-efficiency driver operates from a 2.7V to 5.5V voltage range for 1-cell lithium-ion batteries or a 5V supply. This LED driver consists of eight current sinks, and each sink can regulate up to 30mA with a maximum boost output voltage of up to 40V. The KTZ8868 8-Ch LED backlight driver is ideally used for tablet backlight and bias.

The KTZ8868 features an 11-bit linear or exponential ILED resolution that can be obtained over I2C or PWM dimming. This PWM dimming offers a wide range of frequency and duty cycles to support Content Adaptive Brightness Control (CABC) for additional flexibility. The KTZ8868 maximizes conversion efficiency by up to 85%. This LED driver supports various protection features like inductor current limit protection, output short circuit protection, output over-voltage protection, and LED fault (open or short) protection. The KTZ8868 is equipped with an I2C interface for various controls and status monitors, is RoHS and Green-compliant, and is available in a WQFN55-32 package.

Features

  • Backlight LED driver:
    • 2.7V to 5.5V wide input voltage range
    • 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 range
        • 0.2% to 100% duty cycle at 20kHz
    • Programmable current sink turn on/off ramp time/shape and transition ramp up/down time
    • 1MHz typical boost switching frequency
    • Programmable input PWM hysteresis to minimize jitter at low PWM duty cycle
    • Programmable OVP and current limitation
    • LED open/short protection
  • LCD panel bias:
    • 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 200mA at VIN ≥ 2.9V
    • Active output discharge function
    • Current limitations and short protection
  • Others:
    • System-level input UVLO
    • Thermal shutdown protection
    • Low shutdown current <1µA
    • Flexible I2C interface
    • WQFN55-32 Pb-free package
    • RoHS and Green-compliant
    • -40°C to 85°C operating temperature range

Applications

  • Tablet backlight and bias

Functional Block Diagram

Block Diagram - Kinetic Technologies KTZ8868 High Efficiency 8-Ch LED Backlight Driver

Application Circuit

Application Circuit Diagram - Kinetic Technologies KTZ8868 High Efficiency 8-Ch LED Backlight Driver
Publicado: 2024-01-11 | Actualizado: 2024-01-23