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.