1. Products
  2. Power Management
  3. Switching Regulators
  4. Buck-Boost Regulators
  5. Internal Power Switch Buck-Boost Regulators
  6. LTC3443


Features and Benefits

  • Regulated Output with Input Above, Below or Equal to the Output
  • Single Inductor, No Schottky Diodes
  • High Efficiency: Up to 96%
  • 28µA Quiescent Current in Burst Mode® Operation
  • Up to 1.2A Continuous Output Current from a Single Lithium-Ion
  • True Output Disconnect in Shutdown
  • 2.4V to 5.5V Input Range
  • 2.4V to 5.25V Output Range
  • 600kHz Fixed Frequency Operation
  • Synchronizable Oscillator
  • Selectable Burst Mode or Fixed Frequency Operation
  • <1µA Quiescent Current in Shutdown
  • Small, Thermally Enhanced 12-Lead (4mm × 3mm × 0.8mm) DFN package

Product Details

The LTC3443 is a high efficiency, fixed frequency, buck-boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The part is pin for pin compatible with its predecessor, the LTC3441, with a lower operating frequency (600kHz), and a VC pin clamp circuit during Burst Mode operation. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for single Lithium Ion or multi-cell applications where the output voltage is within the battery voltage range.

The device includes two 0.10Ω N-channel MOSFET switches and two 0.11Ω P-channel switches. External Schottky diodes are optional, and can be used for a moderate efficiency improvement. The operating frequency is internally set to 600kHz and can be synchronized up to 1.2MHz. Quiescent current is only 28µA in Burst Mode operation, maximizing battery life in portable applications. Burst Mode operation is user controlled and can be enabled by driving the MODE/SYNC pin high. If the MODE/ SYNC pin is driven low or with a clock, then fixed frequency switching is enabled.

Other features include a 1µA shutdown, soft-start control, thermal shutdown and current limit. The LTC3443 is available in a thermally enhanced 12-lead (4mm × 3mm) DFN Package.


  • Handheld Computers
  • Handheld Instruments
  • MP3 Players
  • Digital Cameras

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
LTC3443EDE#PBF Material Declaration Reliability Data 12-Lead DFN (4mm x 3mm w/ EP)
LTC3443EDE#TRPBF Material Declaration Reliability Data 12-Lead DFN (4mm x 3mm w/ EP)
Wafer Fabrication Data R415 Reliability Data

Sample & Buy

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Lead Times

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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.