LTC1517-3.3 Micropower, Regulated 3.3V Charge Pump in a 5-Pin SOT-23 Package

Product Details

The LTC1517-3.3 is a micropower charge pump DC/DC converter that produces a regulated 3.3V output. The input voltage range is 2V to 4.4V, allowing a single cell lithium battery to produce a regulated 3.3V output over the entire life of the battery. Extremely low operating current (typically 6µA with no load) and low external parts count (one 0.1µF flying capacitor and two small bypass capacitors at VIN and VOUT) make the part ideally suited for small, light load battery-powered applications. The total printed circuit board area of the application circuit shown below is only 0.045in2.

The part operates as a Burst Mode switched-capacitor voltage doubler to produce a regulated output. The part has thermal shutdown capability and can survive a continuous short circuit from VOUT to GND. The device is available in a 5-pin SOT-23 package.


  • Cellular Telephones
  • Battery-Operated Equipment
  • Local Power Supplies
  • Handheld Instruments
  • PCMCIA Supplies

Features and Benefits

  • Ultralow Power: Icc = 6µA Typ
  • Short-Circuit/Thermal Protected
  • 3.3V ±4% Regulated Output
  • VIN Range: 2V to 4.4V
  • Output Current:
    • 8mA (VIN ≥ 2V)
    • 15mA (VIN ≥ 2.5V)
  • No Inductors
  • Ultrasmall Application Circuit (0.045in2)
  • 700kHz Switching Frequency
  • Available in 5-Pin SOT-23