Features and Benefits

  • Selectable Dual Mode Operation: 1:1.5 or 1:2
  • High Output Current: Up to 500mA
  • Low Noise Constant Frequency (1MHz/0.9MHz) Operation
  • VIN Range: 2.7V to 5.5V
  • Adjustable Output Voltage (LTC3203/LTC3203B)
  • User Selectable Fixed Output Voltages: 4.5V or 5V (LTC3203-1 and LTC3203B-1)
  • Automatic Burst Mode® Operation with IQ ~ 120µA (LTC3203/LTC3203-1)
  • Constant Freqency Operation at All Loads (LTC3203B/LTC3203B-1)
  • Soft-Start Limits Inrush Current at Turn-On
  • Short-Circuit/Thermal Protection
  • Shutdown Disconnects Load from Input
  • Shutdown Current: < 1µA
  • Available in a 10-pin (3mm × 3mm) DFN Package

Product Details

The LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 are low noise, high efficiency charge pump DC/DC converters capable of driving loads up to 500mA from a 2.7V to 5.5V input. Low external parts count (two flying capacitors and bypass capacitors at VIN and VOUT) make the LTC3203 family ideally suited for small, battery-powered applications.

Built-in soft-start circuitry prevents excessive inrush current during start-up. High switching frequency enables the use of small external capacitors. The LTC3203/LTC3203-1 feature Burst Mode operation at light load to achieve high efficiency whereas the LTC3203B/LTC3203B-1 operate at constant frequency to achieve lowest noise operation.

The LTC3203-1/LTC3203B-1 have a user selectable fixed output voltage of 4.5V or 5V to power LEDs or logic circuits. The FB pin of the LTC3203/LTC3203B can be used to program the desired output voltage. The parts are short-circuit and over temperature protected and are available in a low profile (3mm × 3mm) DFN package.


  • High Current LED Backlight Supply for Cellphones/PDAs
  • Cellphone Camera Light Supply
  • General Purpose 3.3V or Li-Ion to 5V Supply
  • USB ON THE GO(OTG) Devices

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (3)

Tools & Simulations


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Reference Designs (1)

Design Resources

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.