Diodes Incorporated
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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.


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


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

Product Specifications

Product Parameters

AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Topologies (Buck) No
Topologies (Buck-Boost) No
Topologies (Boost) Yes
Topologies (Charge Pump) No
Minimum Input Voltage (V) 0.8
Maximum Input Voltage (V) 8
Maximum Output Voltage (V) Ext BJT
Maximum LED Current (A) Ext BJT
Switching Frequency Maximum (kHz) 200
Dimming (PWM) No
Dimming (Analog) No
Efficiency (%) 94
Operating Temperature Range (°C) -40 to 85
Quiescent Current Typ (mA) 0.2
AEC-Q100 Grade No

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