Diodes Incorporated
Back to Medium and Low Voltage DC-DC LED Drivers


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The ZXSC310 is a single or multi cell LED driver designed for LCD backlighting applications. The input voltage range of the device is between 0.8V and 8V. This means the ZXSC310 is compatible with single NiMH, NiCd or Alkaline cells, as well as multi-cell or LiIon batteries. The device features a shutdown control, resulting in a standby current less than 5µA, and an output capable of driving serial or parallel LEDs. The circuit generates constant power output, which are ideal for driving single or multiple LEDs over a wide range of operating voltages. These features make the device ideal for driving LEDs particularly in LCD backlight applications for Digital Still cameras and PDA’s. The ZXSC310 is a PFM DC-DC 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 conversion enabling high efficiency conversion with low input voltages. The drive output of the ZXSC310 LED driver 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 wider range of load currents; several circuit configurations are possible depending on battery life versus brightness considerations. The ZXSC310 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 LED backlight applications.


  • 94% efficiency
  • Minimum operating input voltage 0.8V
  • Maximum operating input voltage 8V
  • Standby current less than 5μA
  • Programmable output current
  • Series or parallel LED configuration
  • Low saturation voltage switching transistor
  • SOT25 package


  • LCD backlights:
  • Digital still camera
  • PDA
  • Mobile phone
  • LED flashlights and torches
  • White LED driving
  • Multiple LED driving

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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