KTD3137 High Efficiency 3-Channel LED Backlight with Panel Flash Function
High Efficiency 3-Channel LED Backlight with Panel Flash Function
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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
- 12-ball 1.19mm x 1.64mm WLCSP or a 16-lead 3mm x 3mm x 0.75mm Thin-QFN package.
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) |
I2Cand PWM |
0.5/1MHz |
WLCSP-12/TQFN33-16 |
Typical Application Diagram
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