Overview

Features and Benefits

  • Side 1 Output Is Compliant with Intel Mobile VID Specifications (Includes 5-Bit DAC)
  • 0.9V to 2.0V Output Voltage with 25mV/50mV Steps
  • Two Sides Run Out-of-Phase to Minimize CIN
  • Precision Internal 0.8V ±1% Reference
  • Two Independent PWM Controllers in One Package
  • All N-Channel External MOSFET Architecture
  • No External Current Sense Resistor
  • 550kHz Switching Frequency Minimizes External Component Size
  • Very Fast Transient Response
  • Up to 25A Output Current per Channel
  • Low Shutdown Current: < 100µA
  • Small 28-Pin SSOP Package

Product Details

The LTC1703 is a dual switching regulator controller optimized for high efficiency with low input voltages. It includes two complete, on-chip, independent switching regulator controllers. Each is designed to drive a pair of external N-channel MOSFET devices in a voltage mode feedback, synchronous buck configuration. The LTC1703 includes digital output voltage adjustment on side 1 that conforms to the Intel Mobile VID specification. It uses a constant-frequency, true PWM design switching at 550kHz, minimizing external component size and cost and optimizing load transient performance. The synchronous buck architecture automatically shifts to discontinuous and then to Burst Mode® operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents.

The LTC1703 features an onboard reference trimmed to 1% and delivers better than 1.5% regulation at the converter outputs. An optional latching FAULT mode protects the load if the output rises 15% above the intended voltage. Each channel can be enabled independently; with both channels disabled, the LTC1703 shuts down and supply current drops below 100µA.

Applications

  • Mobile Pentium® III Processor Systems
  • Microprocessor Core and I/O Supplies
  • Multiple Logic Supply Generator
  • High Efficiency Power Conversion

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.

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTspice

Models for the following parts are available in LTspice:

LTC1703

Product Recommendations

LTC1703 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.

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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