特性 Features

? KTD3116-1: 2 strings, 16 LEDs total

? KTD3117-1: 3 strings, 24 LEDs total

? High efficiency: up to 90

? High frequency step-up converter (800kHz)

? Wide input range: 2.7V to 5.5V

? Integrated 40V Power MOSFET

? Internal compensation and soft start

? Integrated 2- or 3-channel current sink

? Preset 20mA full-scale current per channel

? 1.5 Typ. current matching

? PWM dimming with < 0.3μs rise/fall time

? Low quiescent current

? LED open/short protection

? 31V LED open-circuit (OVP) threshold

? Cycle-by-cycle inductor current limit

? < 1μA shutdown current

? Pb-free Package:

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

KTD3116-1/KTD3117-1 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. KTD3116/7-1 integrates a 40V 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 inductor and capacitor to further

reduce the solution size.

Two regulated current sinks in KTD3116-1 and three sinks

in KTD3117-1 provide per channel 20mA (max.) factory

programmed current. With a 31V OVP, each string can

connect up to eight LEDs in series, for a total of 16 or 24

LEDs in KTD3116-1 and KTD3117-1 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 KTD3116/7-1,

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.

KTD3116/7-1 is available in a RoHS compliant and Green

9-lead 1.2mm x 1.2mm WLCSP package.