1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. LTC3670


Features and Benefits

  • Triple Output Supply from a Single 2.5V to 5.5V Input
  • 400mA Buck DC/DC Plus Dual 150mA LDOs in One IC
  • Outputs Regulate Down to 0.8V
  • ±2.5% Reference Accuracy
  • Constant-Frequency 2.25MHz Operation
  • Independent Enable Pin for Each Output
  • Internal Soft-Start for Each Output
  • See datasheet for additional features

Product Details

The LTC3670 is a triple power supply composed of a 400mA synchronous buck regulator and two 150mA low dropout linear regulators (LDOs). The input supply range of 2.5V to 5.5V is especially well-suited for single-cell Lithium-Ion and Lithium-Ion/Polymer applications, and for powering low voltage ASICs and SoCs from 3V, 3.3V or 5V rails. Regulated output voltages are programmed via external resistors. Each output has its own enable pin for maximum flexibility.

The 400mA buck regulator features constant-frequency 2.25MHz operation, allowing small surface mount inductors and capacitors to be used. Burst Mode operation maintains high efficiency in light-load and no-load conditions. Internal control-loop compensation simplifies application design.

The LTC3670 is available in a 0.75mm profile, 3mm × 2mm 12-lead DFN package.


  • Handheld Products
  • Portable Instruments
  • Single-Cell Li-Ion/Li-Polymer Powered Devices
  • DMB/DVB-H Multimedia Cell Phones
  • Multivoltage Power for Digital Logic, I/O, FPGAs, CPLDs, ASICs, SoCs, CPUs and RF Chipsets

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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Product Recommendations

LTC3670 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.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
LTC3670EDDB#TRMPBF Material Declaration Reliability Data 12-Lead DFN (3mm x 2mm w/ EP)
LTC3670EDDB#TRPBF Material Declaration Reliability Data 12-Lead DFN (3mm x 2mm w/ EP)
Wafer Fabrication Data R415 Reliability Data

Sample & Buy

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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.