1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. External Power Switch Buck Controllers
  6. LTC3701


Features and Benefits

  • Out-of-Phase Controllers Reduce Required Input Capacitance
  • True PLL for Frequency Locking or Frequency Adjustment
  • Operating Frequency Range: 300kHz to 750kHz
  • Wide VIN Range: 2.5V to 10V
  • Constant Frequency Current Mode Architecture
  • Low Dropout: 100% Duty Cycle
  • Power Good Output Voltage Monitor
  • Internal Soft-Start Circuitry
  • Selectable Burst Mode®/Pulse Skipping Operation at Light Loads
  • Output Overvoltage Protection
  • Low Quiescent Current: 460µA
  • 0.8V ±2% Voltage Reference
  • Small 16-Lead Narrow SSOP Package

Product Details

The LTC3701 is a 2-phase dual constant frequency current mode step-down DC/DC controller providing excellent load and line regulation. Power loss and noise due to ESR of the input capacitor are minimized by operating the two controller output stages out-of-phase.

The LTC3701 provides a 0.8V ±2% voltage reference and consumes only 460µA of quiescent current. To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle).

Switching frequency is internally set at 550kHz, allowing the use of small inductors and capacitors. For noise sensitive applications, the LTC3701 can be externally synchronized using its phase-locked loop. The frequency can also be externally set from 300kHz to 750kHz by applying a voltage to the PLLLPF pin. Burst Mode operation is inhibited during synchronization or when the EXTCLK/MODE pin is pulled low to reduce noise and RF interference.

The LTC3701 contains independent internal soft-start circuitry for each controller. Other features include a power good output voltage monitor and output overvoltage and short-circuit protection.

The LTC3701 is available in a small footprint 16-lead narrow SSOP package.


  • One or Two Lithium-Ion Powered Applications
  • Notebook and Handheld Computers
  • Personal Digital Assistants
  • Portable Instruments
  • Distributed DC Power Systems

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)

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Product Recommendations

LTC3701 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
LTC3701EGN#PBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
LTC3701EGN#TRPBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
Wafer Fabrication Data R421 Reliability Data

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Evaluation Boards

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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.