The KTD2536 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 800mA current limit allow KTD2536 to drive up to 36V output (10 LEDs in series), up to 24V using KTD2536B (6 LEDs in series) or up to 19V using KTD2536C (5 LEDs in series). Alternatively, KTD2536 can deliver 160mA total current with 3 series LEDs per string. It can also maximize the current capability while achieving high conversion efficiency. The optimized 0.9MHz and 1.1MHz switching frequencies result 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 KTD2536, 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 KTD2536 is available in a RoHS compliant 6-lead TSOT23 package.


  • Wide output range: up to 10 series LEDs
  • Integrated 40V high current switch (800mA 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
    • KTD2536: 36V
    • KTD2536B: 24V
    • KTD2536C: 19V
  • High switching frequency
    • KTD2536: 900kHz
    • KTD2536B/C: 1.1MHz
  • PWM dimming frequency: 100Hz to 200kHz
  • Simple, small solution size
  • Integrated Soft-start
  • Shutdown Current less than 1µA
  • Small TSOT23-6 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
TSOT23-6 2.90mm x 2.80mm x 0.85mm 6 HD


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 DrawingTSOT23-6 HD PODPDF


Part Number Marking Operating Temperature Package
KTD2536EHD-TR FSYYZ -40°C to +85°C TSOT23-6
KTD2536BEHD-TR __YYZ -40°C to +85°C TSOT23-6
KTD2536CEHD-TR __YYZ -40°C to +85°C TSOT23-6
Purchase Options