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The ZXLD381 is a single cell LED driver designed for applications where step-up voltage conversion from a very low input voltage is required. These applications mainly operate from 1.5V or 1.2V cells. The IC generates constant current pulses that are ideal for driving single or multiple LEDs over a wide range of operating voltages. The ZXLD381 uses a PFM control technique to drive an internal switching transistor which exhibits a low saturation resistance. This ensures high efficiency, even for input voltages as low as 1V. The IC can start up under full load and operates down to an input voltage of only 0.9V. The ZXLD381 is offered in the space saving SOT23 package or in die form, offering an excellent cost vs performance solution for single cell LED driving applications.


  • LED flashlights and torches
  • LED backlights
  • White LED driver


  • 85% Efficiency
  • User adjustable output current
  • Single cell operation (0.9V minimum)
  • Low saturation voltage switching transistor
  • SOT23 package
  • Available also in Die form
  • Simple Application circuit

Product Specifications

Product Parameters

Topology Boost
Minimum Input Voltage 0.9 V
Maximum Input Voltage 2.2 V
Maximum Output Voltage 18 V
LED Current 0.32 A
Switching Frequency 350 kHz
Efficiency 85 %
Operating Temperature Range 0 to 85 °C
Quiescent Current Typ N/A mA

Related Content

Quality Documentation

Technical Documents

ICP Reports

Evaluation Boards and User Guides

Recommended Soldering Techniques



Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
ZXLD381FHTA Mouser Electronics Inc. 4640 7/8/2020 Buy Now United States
ZXLD381FHTA RS Components 3970 7/8/2020 Buy Now England
ZXLD381FHTA Digi-Key Electronics 21000 7/7/2020 Buy Now United States
ZXLD381FHTA Digi-Key Electronics 22793 7/7/2020 Buy Now United States
ZXLD381FHTA RS Components Ltd. 3970 7/7/2020 Buy Now Japan


Product Change Notices

PCN # Issue Date Subject
PCN-2415 2019-06-28 Device End of Life (EOL)