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.


  • Wide output range: up to 10 series LEDs
  • Wide output range: 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
  • LED High switching frequency: 1.2MHz
  • Simple, small solution size
  • Simple, small solution size
  • Integrated Softstart
  • <1µA shutdown current
  • Small TDFN22-6 Package
  • “RoHS” and Green compliant
  • -40˚C to +85˚C Temperature Range


  • LED backlighting
  • Mobile Phones
  • Handheld Devices
  • Digital Photo Frames
  • Automotive Navigation

Packaging Information

Package Dimensions Bumps Package Code
TDFN22-6 2.00mm x 2.00mm x 0.75mm 6 CD


Vin (min)  Vin (max)  Maximum # of LED Channel Channels Control Type
2.7V 5.5V 10 1 PWM

Technical Documentation

Description Documents Type
Package Outline DrawingTDFN22-6 CD PODPDF


Part Number Marking Operating Temperature Package
KTD2505RECD-TR EJYYZ -40°C to +85°C TDFN22-6
Purchase Options
Buy from Digi-Key
Buy from Mouser