LTC3874-1

RECOMMENDED FOR NEW DESIGNS

PolyPhase Step-Down Synchronous Slave Controller with Sub-Milliohm DCR Sensing

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Overview

  • Phase Extender for High Phase Count Voltage Rails
  • Operates with Power Blocks, DrMOS or External Gate Drivers and MOSFETs
  • Accurate Phase-to-Phase Current Sharing
  • Sub-Milliohm DCR Current Sensing
  • Phase-Lockable Fixed Frequency 250kHz to 1MHz
  • Immediate Response to Master IC's Fault
  • Up to 12-Phase Operation
  • Wide VIN Range: 4.5 to 38V
  • VOUT Range :
    • Up to 3.5V (LOWDCR Pin High)
    • Up to 5.5V (LOWDCR Pin Low)
  • Proprietary Current Mode Control Loop
  • Programmable CCM/DCM Operation
  • Programmable Phase Shift Control n 24-Lead (4mm × 4mm) QFN Package

The LTC3874-1 is a dual PolyPhase® current mode synchronous step-down slave controller. It enables high current, multiphase applications when paired with a companion master controller by extending the phase count. Compatible master controllers include the LTC3884-1, LTC3774, LTC3875, LTC3877 and LTC3866. The LTC3874-1 employs a unique architecture that enhances the signal-to-noise ratio of the current sense signal, allowing the use of submilliohm DC resistance power inductors to maximize efficiency while reducing switching jitter. Its peak current mode architecture allows for accurate phase-to-phase current sharing even for dynamic loads.

Effectively working with a master controller, the LTC3874-1 supports all the programmable features as well as fault protection.

Applications

  • High Current Distributed Power Systems
  • Telecom, Datacom and Storage Systems
  • Intelligent Energy Efficient Power Regulation
LTC3874-1
PolyPhase Step-Down Synchronous Slave Controller with Sub-Milliohm DCR Sensing
High Efficiency, 4-Phase 1.8V/120A Step-Down Supply 4-Phase Efficiency and Power Loss vs Output Current, SubMilliohm DCR vs Traditional DCR Package Image 1
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Documentation

Data Sheet 1

Reliability Data 1

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
LTC2975
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Input Current and Energy Measurement
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3874
  • LTC3874-1
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.

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