1. Products
  2. Power Management
  3. Inductorless (Charge Pump) DC/DC Converters
  4. Regulated Step-Down Charge Pumps
  5. LTC3250


Features and Benefits

  • 2.7V to 5.5V Input Voltage Range
  • No Inductors
  • Li-Ion (3.6V) to 1.5V with 81% Efficiency
  • Low Noise Constant Frequency Operation
  • Output Voltages: 1.5V ±4%, 1.2V ±4%
  • Output Current: 250mA
  • Shutdown Disconnects Load from VIN
  • Low Operating Current: IQ = 35µA
  • Low Shutdown Current: ISD <1µA
  • Oscillator Frequency = 1.5MHz
  • Soft-Start Limits Inrush Current at Turn-On
  • Short-Circuit and Overtemperature Protected
  • Low Profile (1mm) ThinSOT Package

Product Details

The LTC3250-1.5/LTC3250-1.2 are charge pump step-down DC/DC converters that produce a 1.5V or 1.2V regulated output from a 2.7V to 5.5V input. The parts use switched capacitor fractional conversion to achieve typical efficiency two times higher than that of a linear regulator. No inductors are required.

A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators.* High frequency operation (fOSC = 1.5MHz) simplifies filtering to further reduce conducted noise. The part also uses Burst Mode® operation to improve efficiency at light loads.

Low operating current (35µA with no load, <1µA in shutdown) and low external parts count (three small ceramic capacitors) make the LTC3250-1.5/LTC3250-1.2 ideally suited for space constrained battery powered applications. The parts are short-circuit and over-temperature protected, and are available in a low profile (1mm) 6-pin ThinSOT package.

*U.S. Patent #6, 411, 531


  • Handheld Computers
  • Cellular Phones
  • Digital Cameras
  • Handheld Medical Instruments
  • Low Power DSP Supplies

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 (1)

Tools & Simulations


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Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC3250ES6-1.2#TRMPBF Material Declaration Reliability Data 6-Lead TSOT-23
LTC3250ES6-1.2#TRPBF Material Declaration Reliability Data 6-Lead TSOT-23
LTC3250ES6-1.5#TRMPBF Material Declaration Reliability Data 6-Lead TSOT-23
LTC3250ES6-1.5#TRPBF Material Declaration Reliability Data 6-Lead TSOT-23
Wafer Fabrication Data R415 Reliability Data

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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.