1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Digitally Programmable Regulators
  6. LTC1705


Features and Benefits

  • Three Regulated Outputs: Core, I/O and CLK in One Package
  • Integrated Intel Mobile 5-Bit VID DAC
  • No External Current Sense Resistors
  • All N-Channel External MOSFET Architecture
  • 550kHz Switching Frequency Minimizes External Component Size and Cost
  • Integrated 150mA LDO Linear Regulator
  • Excellent DC Accuracy: 1.25% for Core, 2% for I/O and CLK Supplies
  • PGOOD Flag Monitors All Three Outputs
  • High Efficiency Over Wide Load Current Range
  • Low Shutdown Current: < 100µA
  • Switchers Run Out-of-Phase to Minimize CIN
  • Small 28-Pin Narrow SSOP Package

Product Details

The LTC1705 is a complete power supply controller for Intel Mobile Pentium processors. It includes two switching regulator controllers, each designed to drive a pair of N-channel MOSFETs in a voltage mode feedback, synchronous buck configuration, to provide the core and I/O supplies. The core controller includes a 5-bit DAC that conforms to the Intel Mobile VID specification. The IC also includes a low dropout linear regulator (LDO) that delivers up to 150mA of output current to provide the CLK supply. The LTC1705 uses a constant-frequency 550kHz PWM architecture, minimizing external component size and cost, as well as optimizing load transient performance. It provides better than 1.25% DC accuracy at its core output, and 2% at I/0 and CLK outputs. The high performance feedback loops allow the circuit to keep total output regulation within ±5% under all transient conditions. An open-drain PGOOD flag indicates that all three outputs are within ±10% of their regulated values. A shutdown circuit disables all three outputs if the RUN/SS pin is pulled to ground. In this mode, the LTC1705 supply current drops to below 100µA.


  • Complete Power Supply Controller for Intel Mobile Pentium® Processors
  • Intel Mobile Pentium Core, I/O, Clock Supplies
  • Multiple Logic Supply Generator

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)

Product Recommendations

LTC1705 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
LTC1705EGN#PBF Material Declaration Reliability Data 28-Lead SSOP (Narrow 0.15 Inch)
LTC1705EGN#TRPBF Material Declaration Reliability Data 28-Lead SSOP (Narrow 0.15 Inch)
Wafer Fabrication Data R384 Reliability Data

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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.