The KTD2151 is a TFT-LCD power supply IC for small and medium size displays for smartphones and tablets. The positive and negative output rails provide bias supplies for TFT LCD panels via the Source Driver IC. The device only requires a single inductor, to reduce the total PCB area.

It features an integrated step-up DC-DC converter with input voltage range from 2.7V to 5.5V. An LDO and charge pump generate dual regulated outputs, whose voltages can be programmed via an I2C compatible interface. Optimized step-up, LDO and charge pump converters maximize conversion efficiency, exceeding 85%.

KTD2151 integrates all compensation and soft-start circuitry, which results in a simpler and smaller solution with much fewer external components. High switching frequency (1.8MHz) allows the use of a smaller inductor and capacitor to further reduce the solution size.

The I2C compatible interface allows control of the positive and negative outputs from +4.0V to +5.2V and from -4.0V to -5.2V, respectively, as well as programming additional registers on the device.

KTD2151 is available in a RoHS compliant 15-bump 2.2mm x 1.45mm x 0.62mm WLCSP.


  • Input voltage range (2.7V to 5.5V)
  • Dual output regulator with single inductor
  • High efficiency above 85%
  • Charge pump with PFM mode at light load
  • Programmable output voltages
  • Positive output voltage range
    • +4.0V to +5.2V (100mV/step)
  • Negative output voltage range
    • -4.0V to -5.2V (100mV/step)
  • Programmable regulator offset voltage
  • 1.0% output voltage accuracy
  • Regulated output current up to 80mA
  • Programmable active discharge
  • I2C compatible interface
  • 100nA shutdown current
  • Pb-free WLCSP-15 and TDFN-14 packages
  • RoHS and Green Compliant
  • -40°C to +85°C Temperature Range


  • Smartphone TFT-LCD
  • Tablet TFT-LCD
  • General Dual Power Supply Applications

Packaging Information

Package Dimensions Bumps Package Code
WLCSP53-15 2.20mm x 1.45mm x 0.62mm 15 UO


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

Technical Documentation

Description Documents Type
Package Outline DrawingWLCSP35-15 UO PODPDF


Part Number VPOS Default Setting VNEG Default Setting Operating Temperature Package
KTD2151BEUO-TR1 +5.0V -5.0V -40°C to +85°C WLCSP-15
KTD2151BEUO-BB-TR1,2 +5.1V -5.1V -40°C to +85°C WLCSP-15
KTD2151BEUO-CC-TR1,2 +5.2V -5.2V -40°C to +85°C WLCSP-15

1 KTD2151B I2C inputs are disabled when both ENP and ENN are logic low.
2 Contact Kinetic sales for availability

Purchase Options
Buy from Digi-Key
Buy from Mouser