特性 Features

? Wide input range: 2.7V to 5.5V

? Highly integrated solution with high efficiency

? Integrated 30V power diode

? Integrated 30V power MOSFET

? Integrated 2-channel current sinks, up to

8-LEDs per string

? High accuracy up to 30mA/ch

? 0.6 current matching at 20mA

? 1.5 current accuracy at 20mA

? Dual dimming control scheme

? I2C interface control with 256 steps

? Wide range PWM Dimming for CABC

? 100Hz to 100kHz Frequency

? 0.1~100 Duty Cycle at 10kHz

? Input PWM glitch filter

? I2C interface for various controls

? Programmable current sink ramp up/down time

and shape (Exponential/Linear)

? Selectable 1MHz and 500kHz switching

frequency with frequency shift option

? Programmable OVP (30V/24V), current limit

(1A/0.7A) and LX pin slew rate

? LED open/short protection

? Pb-free Packages: TQFN33-16, WLCSP-12

? -40°C to +85°C Temperature Range

Applications

? Smartphone/Tablet Backlight

? PDA/GPS Backlight

Brief Description

KTD3122 is the ideal power solution for white LED

backlighting used with small to medium size LCD panels. It

is a highly integrated step-up converter accommodating

single cell lithium ion batteries or 5V regulated supply.

KTD3122 integrates a 30V power diode and a 30V power

MOSFET as well as compensation and soft start circuitry,

which results in a simpler and smaller solution with much

fewer external components. Adjustable switching

frequency (1MHz/500kHz) and OVP threshold (30V/24V)

allow the use of a smaller inductor and capacitor to further

reduce the solution size.

KTD3122 has two regulated current sinks up to 30mA per

string. With a maximum of 30V at the output of the step-up

converter, each string can connect up to 8 LEDs in series,

or up to 16 LEDs total.

KTD3122 is equipped with I2C interface for various

controls. For additional flexibility, wide frequency (100Hz to

100kHz) and duty cycle range (0.1 to 100 at 10kHz)

PWM dimming control is included and can support Content

Adaptive Brightness Control (CABC).

Various protection features are built into KTD3122,

including cycle-by-cycle input current limit protection,

output over-voltage protection, LED fault (open or short)

protection and thermal shutdown protection.

KTD3122 is available in a RoHS compliant and Green

16-lead 3mm x 3mm x 0.75mm Thin-QFN or 12-ball

1.21mm x 1.65mm x 0.62mm WLCSP package.