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.