KTD2681 is the ideal power solution for high-power flash LEDs. It includes a highly integrated synchronous boost converter and two current sources, providing a very small total solution in portable application. It has both I2C interface and hardware STROBE/TORCH pins for maximum control flexibility. The integrated current source on/off and current settings in Flash/Torch/IR modes can be programmed by the I2C interface. It also has three selectable input low voltage protection modes to prevent a system reset under low battery condition.

Various protection features are integrated into KTD2681, including cycle-by-cycle input current limit protection, output over-voltage protection, LED fault (open or short) protection, flash timeout protection and thermal shutdown protection.

KTD2681 is available in a RoHS and Green 12-ball 1.30mm x 1.57mm WLCSP package with 0.4mm pitch.


  • High efficiency synchronous boost converter with 2MHz/4MHz switching frequency option
  • I2C interface programming and hardware STROBE/TORCH control
  • Two-channel independent current sources
    • LED1: Up to 1.5A (7 bits)
    • LED2: Up to 0.75A (6 bits)
    • Flash/Torch/IR modes
    • Independent LED on/off and current settings
    • Programmable ramp shape and time control
    • Three input low voltage protection modes
    • Flash time-out protection
    • LED cathode ground connection for improved thermal dissipation
  • LED open/short protection
  • I2C fault read back (I2C address = 0x63)


  • Smartphones and Tablets Camera Flash
  • Digital Cameras

Packaging Information

Package Dimensions Bumps Package Code
WLCSP34-12 1.30mm x 1.57mm x 0.62mm 12 UR


Vin (min)  Vin (max)  Max. Current per Channel Channels Control Type
2.7V 5.5V 1500mA 1 I2C

Technical Documentation

Description Documents Type
DatasheetKTD2681-04b Datasheet BriefPDF
Package Outline DrawingWLCSP34-12 UR PODPDF


Part Number Marking Operating Temperature Package
Purchase Options
Buy from Digi-Key
Buy from Mouser