特性 Features

? Backlight LED Driver

? Wide input range: 2.9V~5.5V

? High efficiency step-up LED driver with 4-Ch

current sinks, up to 32V boost voltage.

? Up to 30mA/Ch in backlight mode

? ±0.7 current matching at 20mA

? ±2.2 current accuracy at 20mA

? I2C/PWM dual dimming control scheme

? High resolution I2C 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

? Selectable boost switching frequency 1.0MHz

or 500kHz with Auto-Frequency Mode

supported

? Programmable input PWM hysteresis to

minimize jitter at low PWM duty cycle

? Programmable OVP and current limitation

? LED open/short protection

? LCD Panel Bias

? Wide input range: 2.9V~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 150mA

? IREG_OUT up to 300mA at VREG_OUT = 6.0 V, VIN

≥ 3.0 V

? Active output discharge function

? Current limitation and short protection

? Others

? System level input UVLO

? Thermal shutdown protection

? Low shutdown current <1μA

? Flexible I2C interface

? Pb-free Packages: WLCSP-24

? RoHS and Green Compliant

? -40°C to +85°C Temperature Range

Applications

? Smartphone/Tablet Backlight

Brief Description

KTZ8864A is the ideal power solution for LED backlighting

and LCD bias power of small and medium size panels. It

integrates a step-up converter for LED backlighting, a stepup

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 a smaller inductor and capacitor. Its input

operating range is from 2.9V to 5.5V, accommodating 1-

cell lithium ion batteries or 5V supply.

The LED driver’s four regulated current sinks can regulate

up to 30mA with its maximum boost output voltage up to

32V. 11-bit linear or exponential ILED resolution can be

obtained over I2C 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 I2C interface. By integrating

synchronous rectification MOSFETs for the step-up

converter and charge pump, the KTZ8864A maximizes

conversion efficiency up to 85.

Various protection features are built into KTZ8864A,

including inductor current limit protection, output short

circuit protection, output over-voltage protection, LED fault

(open or short) protection and thermal shutdown

protection.

KTZ8864A is equipped with I2C interface for various

controls and status monitor.

KTZ8864A is available in a RoHS and Green compliant 24-

ball 1.72mm x 2.45mm x 0.62mm WLCSP package.