Features and Benefits

  • Ultralow Power: 8μA Quiescent Current
  • Regulated Output Voltages: 3.3V ±4%, 5V ±4%, ADJ
  • VIN Range:
    • 1.8V to 4.4V (LTC3221-3.3)
    • 2.7V to 5.5V (LTC3221-5)
  • Output Current: Up to 60mA
  • No Inductors Needed
  • Very Low Shutdown Current: <1μA
  • Shutdown Disconnects Load from VIN
  • Burst Mode Control
  • Short-Circuit Protected
  • Solution Profi le < 1mm
  • Tiny 2mm × 2mm 6-Pin DFN Package

Product Details

The LTC3221 family are micropower charge pump DC/DC converters that produce a regulated output at up to 60mA. The input voltage range is 1.8V to 5.5V. Extremely low operating current (8μA typical at no load) and low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make them ideally suited for small, battery-powered applications.

The LTC3221 family includes fi xed 5V and 3.3V output versions plus an adjustable version. All parts operate as Burst Mode® switched capacitor voltage doublers to achieve ultralow quiescent current. The chips use a controlled current to supply the output and will survive a continuous short-circuit from VOUT to GND. The FB pin of the adjustable LTC3221 can be used to program the desired output voltage.

The LTC3221 family is available in a low profile (0.75mm) 2mm × 2mm 6-pin DFN package.


  • Low Power 2 AA Cell to 3.3V Supply
  • Memory Backup Supplies
  • Tire Pressure Sensors
  • General Purpose Low Power Li-Ion to 5V Supply
  • RF Transmitters
  • Glucose Meters

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


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.


Models for the following parts are available in LTspice:


Design Resources

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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Evaluation Boards Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.