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The ZXSC300 is a single or multi cell LED driver designed for applications where step-up voltage conversion from very low input voltages is required. These applications mainly operate from single 1.5V or 1.2V battery cells. The circuit generates constant current pulses that are ideal for driving single or multiple LEDs over a wide range of operating voltages. The ZXSC300 is a PFM controller IC that drives an external Zetex switching transistor with a very low saturation resistance. These transistors are the best switching devices available for this type of switching conversion enabling high efficiency conversion with input voltages below 1V. The drive output of the ZXSC controller generates a dynamic drive signal for the switching transistor. The circuit can start up under full load and operates down to an input voltage of 0.8 volts. The solution configuration ensures optimum efficiency over a wide range of load currents, several circuit configurations are possible depending on battery life versus brightness considerations. The ZXSC300 is offered in the SOT25 package which, when combined with a SOT23 switching transistor, generates a high efficiency small size circuit solution. The IC and discrete combination offers the ultimate cost vs performance solution for single cell LED driving applications.


  • LED flashlights and torches
  • LED backlights
  • White LED driving
  • Multiple LED driving
  • Solar Equipment


  • 94% efficiency
  • Minimum operating input voltage 0.8V
  • Fixed output current
  • Low saturation voltage switching transistor
  • SOT25 package

Product Specifications

Product Parameters

Topology Boost
Minimum Input Voltage 0.8 V
Maximum Input Voltage 8 V
Maximum Output Voltage Ext BJT V
LED Current Ext BJT A
Switching Frequency 200 kHz
Efficiency 94 %
Operating Temperature Range -40 to 85 °C
Quiescent Current Typ 0.2 mA

Related Content

Quality Documentation

Technical Documents

Application Notes

Design tool model software

ICP Reports

Recommended Soldering Techniques


Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
ZXSC300E5TA Arrow Electronics 2997 1/19/2020 Buy Now United States
ZXSC300E5TA Mouser Electronics Inc. 2362 1/19/2020 Buy Now United States
ZXSC300E5TA Digi-Key Electronics 3885 1/18/2020 Buy Now United States
ZXSC300E5TA RS Components 3777 1/18/2020 Buy Now England
ZXSC300E5TA RS Components Ltd. 3777 1/18/2020 Buy Now Japan