LTC3870
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3870

PolyPhase Step-Down Slave Controller for Digital Power System Management

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 4
1ku List Price Starting From $2.84
Features
  • LTC3880 Family Phase Extender Supporting LTC3880/3880-1, LTC3883/3883-1, LTC3886, LTC3887 Master Controllers
  • 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 of CCM/DCM Operation
  • Pin Programmable of Phase-Shift Control
  • Integrated Powerful N-Channel MOSFET Gate Drivers
  • Available in a 28-Pin (4mm × 5mm) QFN Package
Additional Details
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The LTC3870 is a PolyPhase® step-down slave controller specially designed for multiphase operation with the LTC3880 family 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 master controller. A peak current mode architecture provides the LTC3870 with excellent current sharing from phase to phase and from chip to chip.

Coherently working with the LTC3880 family, the LTC3870 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 master controller from 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
Part Models 4
1ku List Price Starting From $2.84

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Documentation

Documentation

Video

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3870EUFD#PBF
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LTC3870EUFD#TRPBF
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LTC3870IUFD#PBF
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LTC3870IUFD#TRPBF
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Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3870EUFD#PBF

PRODUCTION

LTC3870EUFD#TRPBF

PRODUCTION

LTC3870IUFD#PBF

PRODUCTION

LTC3870IUFD#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3870EUFD#PBF

PRODUCTION

LTC3870EUFD#TRPBF

PRODUCTION

LTC3870IUFD#PBF

PRODUCTION

LTC3870IUFD#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 3

reference details image

DC2155A-B

LTC3886UKG/LTC3870UFD Demo Board (RSENSE) | 4 Phase Single Output PMBus Buck 18V≤VIN ≤54V, VOUT=12V at 48A, 150kHz

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DC2155A-B

LTC3886UKG/LTC3870UFD Demo Board (RSENSE) | 4 Phase Single Output PMBus Buck 18V≤VIN ≤54V, VOUT=12V at 48A, 150kHz

LTC3886UKG/LTC3870UFD Demo Board (RSENSE) | 4 Phase Single Output PMBus Buck 18V≤VIN ≤54V, VOUT=12V at 48A, 150kHz

Product Detail

Demonstration circuit 2155A is available in two configurations. The DC2155A-A is a dual output synchronous step-down converter featuring the LTC3886, a dual-phase current mode controller. The DC2155A-B is a single output synchronous step-down converter that operates with four phases: two from the LTC3886 and two from LTC3870, a phase extender. Both versions have a PMBus interface and digital power system management functions.

reference details image

DC2089A-A

LTC3880EUJ/LTC3870EUFD RSENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A

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DC2089A-A

LTC3880EUJ/LTC3870EUFD RSENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A

LTC3880EUJ/LTC3870EUFD RSENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A

Product Detail

Demonstration circuit 2089A is a high current, high efficiency, poly-phase synchronous buck converter featuring the LTC3880EUJ, a dual-phase current mode controller, and the LTC3870EUFD, a dual-phase slave controller. The LTC3880 has the PMBus interface and power system management functions.


The input range of this board is from 7V to 14V, and the output voltage can be programmed from 0.8V to 1.8V. The output current is up to 80A for 4-phase operation. The DC2089A has two versions, the DC2089A-A uses a current sense resistor, while the DC2089A–B has DCR current sensing. The factory default setting for the output voltage is 1.0V.


You can use a PC to reconfigure the power management features of the LTC3880 such as: nominal VOUT, margin set points, OV/UV limits, temperature fault limits, sequencing parameters, the fault log, fault responses, GPIO and other functionality.

reference details image

DC2089A-B

LTC3880EUJ/LTC3870EUFD DCR SENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A

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DC2089A-B

LTC3880EUJ/LTC3870EUFD DCR SENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A

LTC3880EUJ/LTC3870EUFD DCR SENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A

Product Detail

Demonstration circuit 2089A is a high current, high efficiency, poly-phase synchronous buck converter featuring the LTC3880EUJ, a dual-phase current mode controller, and the LTC3870EUFD, a dual-phase slave controller. The LTC3880 has the PMBus interface and power system management functions.


The input range of this board is from 7V to 14V, and the output voltage can be programmed from 0.8V to 1.8V. The output current is up to 80A for 4-phase operation. The DC2089A has two versions, the DC2089A-A uses a current sense resistor, while the DC2089A–B has DCR current sensing. The factory default setting for the output voltage is 1.0V.


You can use a PC to reconfigure the power management features of the LTC3880 such as: nominal VOUT, margin set points, OV/UV limits, temperature fault limits, sequencing parameters, the fault log, fault responses, GPIO and other functionality.

Tools & Simulations

Tools & Simulations 2

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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