38V/26V Step-Up LED Driver with PWM/ExpressWireTM Control

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KTD2500 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 0.75A current limit allow KTD2500 to drive up to 38V output (10 LEDs in series) or up to 26V using KTD2500B (6 LEDs in series). It can also maximize the current capability while achieving high conversion efficiency. The optimized 600kHz 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 KTD2500, 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.

KTD2500 is available in an RoHS and Green compliant 6- lead TDFN 2x2mm package.


  • Wide output range: up to 10 series LEDs
  • Integrated 40V high current switch (0.75A 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
    • KTD2500: 38V
    • KTD2500B: 26V
  • High switching frequency: 600kHz
  • 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 ECD


Vin (min)  Vin (max)  Control Max. Current per Channel Vout Accuracy IQ Shutdown (SDA=SCL=1.8V)
2.7V 5.5V I2C 80mA 4.0~5.2V 1.5% 6µA


Part Number Marking Operating Temperature Package
KTD2500ECD-TR DRYYZ -40°C to +85°C TDFN22-6
KTD2500BECD-TR DSYYZ -40°C to +85°C TDFN22-6

Purchase Options Coming Soon