1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Buck Regulator Plus LDO
  6. LTC3700


Features and Benefits

  • Dual Output Regulator in Tiny 10-Pin MSOP
  • High Efficiency: Up to 94%
  • Wide VIN Range: 2.65V to 9.8V
  • Constant Frequency 550kHz Operation
  • 150mA LDO Regulator with Current Limit and Thermal Shutdown Protection
  • High Output Currents Easily Achieved
  • Burst Mode® Operation at Light Load
  • Low Dropout: 100% Duty Cycle
  • Current Mode Operation for Excellent Line and Load Transient Response
  • 0.8V Reference Allows Low Output Voltages
  • Low Quiescent Current: 260µA Total
  • Shutdown Mode Draws Only 10µA Supply Current
  • Common Power Good Output for Both Supplies

Product Details

The LTC3700 is a constant frequency current mode stepdown (buck) DC/DC controller with excellent AC and DC load and line regulation. The on-chip 150mA low dropout (LDO) linear regulator can be powered from the buck controller’s input supply, its own independent input supply or the buck regulator’s output. The buck controller incorporates an undervoltage lockout feature that shuts down the controller when the input voltage falls below 2.1V.

The buck regulator provides a ±2.5% output voltage accuracy. It consumes only 210µA of quiescent current in normal operation with the LDO consuming an additional 50µA. In shutdown, a mere 10µA (combined) is consumed.

For applications where efficiency is a prime consideration, the buck controller is configured for Burst Mode operation which enhances efficiency at low output current. To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High constant operating frequency of 550kHz allows the use of a small external inductor.

The LDO is protected by both current limit and thermal shutdown circuits.

The LTC3700 is available in a tiny 10-pin MSOP.


  • Notebook Computers
  • Portable Instruments
  • One or Two Li-Ion Battery-Powered Applications

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

LTC3700 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
LTC3700EMS#PBF Material Declaration Reliability Data 10-Lead MSOP
LTC3700EMS#TRPBF Material Declaration Reliability Data 10-Lead MSOP
Wafer Fabrication Data R402 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.