High Efficiency 4-CH LED Backlight Driver with Dual LCD Bias Power

Backlight LED Driver

  • Wide input range: 2.7V~5.5V
  • High efficiency step-up LED driver with 4-Ch current sinks, up to 32V 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
  • Selectable boost switching frequency 1.0MHz or 500kHz with Auto-Frequency Mode supported
  • Programmable input PWM hysteresis to minimize jitter at low PWM duty cycle
  • Programmable OVP and current limitation
  • 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 120mA
  • Active output discharge function
  • Current limitation and short protection

Others

  • System level input UVLO
  • Thermal shutdown protection
  • Low shutdown current <1μA
  • Flexible I2C interface
  • Pb-free Packages: WLCSP-24
  • -40°C to +85°C Temperature Range

Applications

  • Smartphone/Tablet Backlight

Key Electrical Specifications

Vin(Min) Vin(Max) Number of LEDs/Channel Channels Control Type Package
2.7V 5.5V 8 4 I2C WLCSP-24

1.72 x 2.45mm

Typical Application Diagram