1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. LTC1627


Features and Benefits

  • High Efficiency: Up to 96%
  • Constant Frequency 350kHz Operation
  • 2.65V to 8.5V VIN Range
  • VOUT from 0.8V to VIN, IOUT to 500mA
  • No Schottky Diode Required
  • Synchronizable Up to 525kHz
  • Selectable Burst Mode Operation
  • Low Dropout Operation: 100% Duty Cycle
  • Precision 2.5V Undervoltage Lockout
  • Secondary Winding Regulation
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Low Quiescent Current: 200µA
  • Shutdown Mode Draws Only 15µA Supply Current
  • ±1.5% Reference Accuracy
  • Available in 8-Lead SO Package

Product Details

The LTC1627 is a monolithic current mode synchronous buck regulator using a fixed frequency architecture. The operating supply range is from 8.5V down to 2.65V, making it suitable for one or two lithium-ion battery-powered applications. Burst Mode operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation, which extends operating time in battery-operated systems.

The operating frequency is internally set at 350kHz, allowing the use of small surface mount inductors. For switching noise sensitive applications it can be externally synchronized up to 525kHz. The SYNC/FCB control pin guarantees regulation of secondary windings regardless of load on the main output by forcing continuous operation. Burst Mode operation is inhibited during synchronization or when the SYNC/FCB pin is pulled low to reduce noise and RF interference. Soft-start is provided by an external capacitor.

Optional bootstrapping enhances the internal switch drive for single lithium-ion cell applications. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode, saving components and board space. The LTC1627 comes in an 8-lead SO package.


  • Cellular Telephones
  • Portable Instruments
  • Wireless Modems
  • RF Communications
  • Distributed Power Systems
  • Scanners
  • Single and Dual Cell Lithium

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

LTC1627 Companion Parts

Recommended Related Parts

Recommended Suggested Oscillator

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
LTC1627CS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LTC1627CS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LTC1627IS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LTC1627IS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
Wafer Fabrication Data R384 Reliability Data

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Sample & Buy

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Buy Now Pricing

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List Pricing

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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.