LTC1703

PRODUCTION

Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID

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Overview

  • 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

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
LTC1703
Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID
Dual Output Mobile Pentium III Processor Supply Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 4

Technical Articles 2

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC1703
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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.

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