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KTD3137

High Efficiency 3-Channel LED Backlight with Panel Flash Function

        • 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