特性 Features

? Wide output range: up to 10 series LEDs

? Integrated 40V high current switch (1.2A limit)

? VIN: 2.7V~5.5V

? High efficiency PWM converter (up to 88)

? Low 200mV feedback voltage

? Single-wire interface dual method dimming:

? ExpressWire Digital Control

? PWM dimming

? High accuracy across full load range

? LED open-circuit (OVP) protection: 38V

? High switching frequency: 1.2MHz

? Simple, small solution size

? Integrated Softstart

? < 1 μA shutdown current

? Small TDFN22-6 Package

? RoHS and Green compliant

? -40?C to +85?C Temperature Range

Applications

? LED backlighting

? Mobile Phones

? Handheld Devices

? Digital Photo Frames

? Automotive Navigation

Brief Description

KTD2505R is a versatile constant current LED driver with

a high efficiency DC-DC step up “boost” converter

architecture. The low-side power MOSFET is integrated in

the device, minimizing the total number of external

components. Unique technology and high 1.2A current limit

allow KTD2505R to drive up to 38V output (10 LEDs in

series). It can also maximize the current capability while

achieving high conversion efficiency. The optimized

1.2MHz switching frequency results in reduced conduction

loss and small external component size. A single wire

interface is integrated which can be used for PWM

dimming or ExpressWire dimming in 32 steps.

Various protection features are built into KTD2505R,

including cycle-by-cycle input current limit protection, LED

open-circuit (output over voltage) protection and thermal

shutdown protection. The leakage current in shutdown

mode is less than 1μA.

KTD2505R is available in an RoHS and Green compliant

6-lead TDFN 2x2mm package.