KTZ8868

December 2023 – Revision 04a Page 1 of 40 Kinetic Technologies Confidential

High Efficiency 8-CH LED Backlight Driver with Dual LCD Bias Power

Features

• Backlight LED Driver



Wide input range: 2.7V~5.5V



High efficiency step-up LED driver with 8-Ch

current sinks, up to 40V boost voltage.

■

Up to 30mA/Ch in backlight mode

■

±0.7% current matching at 20mA

■

±2.2% current accuracy at 20mA



C/PWM dual dimming control scheme

■

High resolution I

C 11-bit linear or exponential

dimming

■

Wide range PWM dimming.

 100Hz to 100kHz frequency

 0.2% to 100% duty cycle at 20kHz



Programmable current sink turn on/off ramp

time/shape and transition ramp up/down time.



1.0MHz typical boost switching frequency



Programmable input PWM hysteresis to minimize

jitter at low PWM duty cycle.



Programmable OVP and current limit



LED open/short protection

• LCD Panel Bias



Wide input range: 2.7V~5.5V



Programmable dual output Bias regulator using a

single inductor.



Programmable ramp time for OUTP and OUTN



Charge pump PFM mode at light load



LCD Bias efficiency: up to 85%



Wide dual output voltage range ±4.0V to ±6.3V

(50mV/step) and output current up to 250mA at

≥ 2.9 V.



Active output discharge function



Current limit and short protection

• Others



System level input UVLO



Thermal shutdown protection



Low shutdown current <1µA



Flexible I

C interface



Pb-free Packages:



WQFN55-32 (5mm x 5mm, 32 Lead)



RoHS and Green Compliant



-40°C to +85°C Temperature Range

Brief Description

KTZ8868 is the ideal power solution for LED

backlighting and LCD bias power of medium size

panels. It integrates two step-up converters for LED

backlighting, a step-up converter with LDO and

inverting charge pump for LCD bias power, resulting in

a simpler and smaller solution with fewer external

components. High switching frequency allows the use

of smaller inductors and capacitors. Its input operating

range is from 2.7V to 5.5V, accommodating 1-cell

lithium-ion batteries or 5V supply.

The LED driver has two step-up converters, and each

converter drivers four current sinks with total eight

current sinks. Each current sink can regulate up to

30mA with its maximum boost output voltage up to

40V. 11-bit linear or exponential I

LED

resolution can be

obtained over I

C or PWM dimming. For additional

flexibility, PWM dimming offers wide range frequency

and duty cycle to support Content Adaptive Brightness

Control (CABC).

The LCD bias power section includes a step-up

converter, LDO and an inverting charge pump to

generate dual outputs, OUTP and OUTN, whose

voltages can be programmed via an I

C interface. By

integrating synchronous rectification MOSFETs for the

step-up converter and charge pump, the KTZ8868

maximizes conversion efficiency up to 85%.

Various protection features are built into KTZ8868,

including inductor current limit protection, output

short circuit protection, output over-voltage

protection, LED fault (open or short) protection and

thermal shutdown protection.

KTZ8868 is equipped with I

C interface for various

controls and status monitor.

KTZ8868 is available in a RoHS and Green compliant

WQFN55-32 (5mm x 5mm, 32 Lead).

Applications

• Tablet Backlight and Bias