High Efficiency 3-Channel LED Backlight with Panel Flash Function

Features

  • Wide input range: 2.7V~5.5V
  • High efficiency step-up 3-Channel LED driver
  • 3-Ch current sinks, up to 8-LEDs per string
    • Up to 29.8mA/Ch in backlight mode and up to 59.6mA/Ch in flash mode;
    • +/-0.6% current matching at 20.2mA;
    • +/-1.5% current accuracy at 20.2mA
  • I2C/PWM dualdimming control scheme
    • 11-bit I2C exponentialor linear mapping with programmable transition ramp time
    • Wide range PWM dimming with programable transition ramp time
    • 100Hz to 100kHz frequency
    • 0.2% to 100% duty cycle at 20kHz
  • Programmable current sink turn on/off ramp time and shape
  • Selectable boost converter switching frequency 1MHz or 500kHz with 20% shift up option
  • Programmable input PWM hysteresis to minimize jitter at low PWM duty cycle
  • Programmable OVP (25.9V/32V) and current limit (2.6A/1.8A)
  • Programmable flash current and timeout
  • LED open/short protection
  • Status reporting through I2C interface

Applications

  • Smartphone/Tablet Backlight and Selfie Flash

Key Electrical Specifications

Vin

 (Min) 

 Vin

 (Max) 

  Over Voltage 

Prptection 

  Chanels   Number 

of LEDs

  Maximum 

Current 

  Dimming 

Control

 Switching

 Frequency 

  Package 
2.7V 5.5V 26/32V 3 24  30mA/

60mA (flash)

 I2C

and PWM

 0.5/1MHz  WLCSP-12/

TQFN33-16

Typical Application Diagram

KTD3137