Features and Benefits

  • Up to 96% Efficiency
  • True Output Load Disconnect
  • Inrush Current Limiting and Internal Soft-Start
  • Low Voltage Start-Up: 0.85V
  • Automatic Burst Mode® Operation with IQ ~ 20µA
  • Continuous Switching at Light Loads (LTC3429B)
  • Internal Synchronous Rectifier
  • Current Mode Control with Internal Compensation
  • Short-Circuit Protection
  • 500kHz Fixed Frequency Switching
  • Input Range: 0.5V to 4.4V
  • Output Range: 2.5V to 4.3V (Up to 5V with Schottky)
  • Shutdown Current: <1µA
  • Antiringing Control Minimizes EMI
  • Tiny External Components
  • Low Profile (1mm) SOT-23 Package

Product Details

The LTC3429/LTC3429B are high efficiency synchronous, fixed frequency, step-up DC/DC converters with true output load disconnect, inrush current limiting and softstart in a low profile 6-lead ThinSOTTM package. These devices are capable of supplying 100mA from a single AA cell input or 250mA from a 2-cell AA with a 3.3V output.

A switching frequency of 500kHz minimizes overall solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. Current mode PWM control with internal compensation reduces external parts count thereby saving critical board real estate. The LTC3429 shifts automatically to power saving Burst Mode operation at light loads while the LTC3429B features continuous switching at light loads. Antiringing control circuitry reduces EMI concerns by damping the inductor in discontinuous mode.

The devices also feature low shutdown current of under 1µA. The true output disconnect feature allows the output to be completely discharged in shutdown. It also limits the inrush of current during start-up, minimizing surge currents seen by the input supply.


  • MP3 Players
  • Digital Cameras
  • LCD Bias Supplies
  • Handheld Instruments
  • Wireless Handsets
  • GPS Receivers

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 (2)

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Product Recommendations

LTC3429 Companion Parts

Recommended Related Parts

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.

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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.