特性 Features

? Wide VIN input range: 2.7V to 5.5V

? Wide output range: up to 10 series LEDs

? Integrated 40V high current switch (0.52A limit)

? High efficiency boost converter (up to 85)

? Highly integrated solution

? Integrated diode

? Internal compensation and soft start

? ExpressWireTM interface dual method dimming

with single pin (CTRL)

? 256-step Serial dimming control

? High resolution PWM dimming

? High accuracy across full load range

? LED open-circuit (OVP) protection

? KTD2801 : 36V

? KTD2801A : 30V

? KTD2801B : 24V

? Low 200mV feedback voltage

? 1MHz High switching frequency

? Simple, small solution size

? < 1 μA shutdown current

? Small TDFN22-6 and Thin SOT23 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

The KTD2801/A/B is a versatile constant current LED

driver with a high efficiency DC-DC step up “boost”

converter architecture. The low-side power MOSFET and

high-side diode are integrated in the device, minimizing the

total number of external components. Unique technology

and high 0.52A current limit allow KTD2801 to drive up to

36V output (10 LEDs in series), or KTD2801A 30V output

(8 LEDs in series) or KTD2801B 24V output (6 LEDs).

Alternatively, the KTD2810 can deliver 40mA total current

for two parallel strings of up to 6 series LEDs. It can also

maximize the current capability while achieving high

conversion efficiency. The optimized 1MHz switching

frequency results in small external component size. The

driver is equipped with an internal decoder that allows

digital FB control dimming for 256-step (8-bit) current

programming and can also be used for PWM dimming with

a one-line control signal.

Various protection features are built into the KTD2801/A/B,

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.

The device is available in a RoHS compliant 6-lead

TDFN22 package and 6-lead Thin SOT-23 package