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
 +/-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 (2.6A/1.8A)
• LED open/short protection
• Status reporting through I2C interface

Applications

• Smartphone/Tablet Backlight

Brief Description

KTD3136 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 three 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 three regulated current sinks can regulate up
to 29.8mA. 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 24-LED application.
KTD3136 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 KTD3136,
including cycle-by-cycle inductor current limit protection,
output overvoltage protection, LED fault (open or short)
protection and thermal shutdown protection.
KTD3136 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.