特性 Features

? Drive up to 6 LEDs per string

? KTD3112: 2 strings, 12 LEDs total

? KTD3113: 3 strings, 18 LEDs total

? High efficiency: up to 90

? High frequency step-up converter (800kHz)

? Wide input range: 2.7V to 5.5V

? Integrated 30V Power MOSFET

? Internal compensation and soft start

? Integrated 2- or 3-channel current sink

? Preset max. 20mA/25mA current per channel

? 1.5 Typ. current matching

? PWM dimming with < 0.3μs rise/fall time

? Low quiescent current

? LED open/short protection

? 25V LED open-circuit (OVP) threshold

? Cycle-by-cycle inductor current limit

? < 1μA shutdown current

? Pb-free Packages: TQFN33-16,

WLCSP-9 1.2mm x 1.2mm

? -40°C to +85°C Temperature Range

Applications

? Smartphone

? PDA

? GPS

? Portable media players

? Other 1-cell Li Ion LED applications

Brief Description

KTD3112/KTD3113 is the ideal power solution for white

LED backlighting used with medium to small size LCD

panels. It is a highly integrated step up DC-DC converter

with input voltage range from 2.7V to 5.5V, accommodating

1-cell lithium ion battery or 5V regulated supply.

KTD3112/3 integrates 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. High switching frequency (800kHz) allows

the use of a smaller sized inductor and capacitor.

Two regulated current sinks in KTD3112 and three sinks in

KTD3113 provide per channel 20mA/25mA (max.) factory

programmed current. With a 25V OVP, each string can

connect up to six LEDs in series, for a total of 12 or 18

LEDs in KTD3112 and KTD3113 respectively.

A PWM dimming control is included for wide output

dimming range. The device has an EN pin which enables

the IC.

Various protection features are built into KTD3112/3,

including cycle-by-cycle input current limit protection,

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

protection and thermal shutdown protection. The leakage

current in shutdown mode is less than 1μA.

KTD3112/3 is available in a RoHS compliant and Green

16-lead 3mm x 3mm x 0.75mm ThinQFN or 9-lead 1.2mm

x 1.2mm WLCSP package.