LTC3870-1

RECOMMENDED FOR NEW DESIGNS

PolyPhase Step-Down Slave Controller for Digital Power System Management

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Overview

  • LTC3887-1 Phase Extender
  • Operates with Power Blocks, DrMOS or External Gate Drivers and MOSFETs
  • Cascade with Multiple Chips for Very Large Current Applications
  • Accurate PolyPhase Current Sharing
  • EXTVCC Capable of 5V to 14V Input
  • Wide VIN Range: 4.5V to 60V
  • Wide Output Voltage Range : 0.5V to 14V
  • Wide SYNC Frequency Range: 100kHz to 1MHz
  • Pin Programmable CCM/DCM Operation
  • Pin Programmable Phase-Shift Control
  • Available in a 24-Pin (4mm × 4mm) QFN Package

The LTC3870-1 is a PolyPhase® step-down slave controller specially designed for multiphase operation with LTC's digital power system management DC/DC controllers. It provides a small and cost effective solution for supplying very large currents by cascading it with a LTC3887-1 controller. A peak current mode architecture provides the LTC3870-1 with excellent current sharing from phase to phase and from chip to chip.

Coherently working with the LTC3887-1, the LTC3870-1 does not require additional I2C addresses, and it supports all programmable features as well as fault protection. The constant switching frequency can be synchronized to an external clock from the LTC3887-1 over a range of 100kHz to 1MHz.

Onboard MOSFET Gate Drivers Package
LTC3870 Yes 4x5 QFN-28
LTC3870-1 No – Works with DrMOS and Power Blocks 4x4 QFN-24

Applications

  • High Power Distributed Power Systems
  • Telecom Systems
  • Industrial Applications
LTC3870-1
PolyPhase Step-Down Slave Controller for Digital Power System Management
Load Transient Response of a 2-Phase Master (3887-1)/Slave (3870-1) Converter Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Informational 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Switching Regulators & Controllers 1
LTC3887
LTC3887-1
LTC3887-2
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:

  • LTC3870
  • LTC3870-1
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.

Evaluation Kits

eval board
schematic 1
DC2454A

LTC3887EUJ-1/LTC3870EUF-1 Demo Board | Dual Phase PMBus Buck Controller with Slave Controller, 7V ≤ VIN ≤ 14V, 0.8V ≤ VOUT ≤ 1.8V @ 100A

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Product Details

Demonstration circuit 2454A is a high current, high efficiency, poly-phase synchronous buck converter featuring the LTC3887EUJ-1, a dual-phase current mode controller, and the LTC3870EUF-1, a dual-phase slave controller. The LTC3887-1 has the PMBus interface and the power system management functions.


 
DC2454A
LTC3887EUJ-1/LTC3870EUF-1 Demo Board | Dual Phase PMBus Buck Controller with Slave Controller, 7V ≤ VIN ≤ 14V, 0.8V ≤ VOUT ≤ 1.8V @ 100A
DC2454A - Schematic

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