Features

? Up to 3 or 5 series LEDs

? Integrated 20V high current switch (1.2A limit)

? High efficiency PWM converter (up to 90)

? Low 200mV feedback voltage

? High accuracy across full load range

? VIN range 2.7V to 5.5V

? LED open-circuit (OVP) protection

? KTD2511C: 19V

? KTD2511D: 14V

? High switching frequency: 1MHz

? PWM dimming frequency: 100Hz to 200kHz

? Simple, small solution size

? Integrated Soft-start

? Shutdown Current less than 1μA

? Small TSOT23-6 and TDFN22-8 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 KTD2511 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. High 1.2A current limit and 14V or 19V OVP

allow the KTD2511D/C to drive numerous parallel strings

of 3 or 5 LEDs in series, with KTD2511D or KTD2511C,

respectively. KTD2511 can deliver 260mA total current

with 3 series LEDs per string. It can also maximize the

current capability while achieving high conversion

efficiency. The optimized 1.0MHz switching frequency

results in small external component size. The driver allows

a wide range of PWM dimming frequencies through the EN

pin.

Various protection features are built into the KTD2511,

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 KTD2511 is available in a RoHS compliant 6-lead

TSOT23 and 8-lead TDFN22 package.