Features

• Wide input range: 2.7V~5.5V
• High efficiency step-up 2-Channel LED driver
• 2-Ch current sinks, up to 8-LEDs per string
 Up to 29.8mA/Ch in backlight mode
 +/-0.6% current matching at 20.2mA
 +/-1.5% current accuracy at 20.2mA
• I2C/PWM dual dimming control scheme
 11-bit I2C exponential or 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 (1.8A/2.6A)
• LED open/short protection
• Status reporting through I2C interface
Applications

• Smartphone/Tablet Backlight

Brief Description

KTD3133 is the ideal power solution for LED backlighting
in medium to large size LCD panels. It is a highly integrated
step-up DC-DC converter operating with an input voltage
from 2.7V to 5.5V, accommodating 1-cell lithium ion
batteries or 5V supply. It includes a high voltage power
NMOS, as well as two current sinks, resulting in a simpler
and smaller solution with fewer external components. High
switching frequency allows the use of a smaller inductor
and capacitor.
Each of the two regulated current sinks can regulate up to
29.8mA in backlight mode. With a maximum of 32V at the
output of the step-up converter, each string can connect up
to 8-LED in series for a 16-LED application.
KTD3133 is equipped with I2C interface for various controls.
For additional flexibility, PWM dimming with wide range
frequency and duty cycle is included to support Content
Adaptive Brightness Control (CABC).
Various protection features are built into KTD3133,
including cycle-by-cycle inductor current limit protection,
output over-voltage protection, LED fault (open or short)
protection and thermal shutdown protection.
KTD3133 is available in a RoHS compliant 12-ball 1.19mm
x 1.64mm WLCSP or a 16-lead 3mm x 3mm x 0.75mm
Thin-QFN package.