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.

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