LTC3870

RECOMMENDED FOR NEW DESIGNS

PolyPhase Step-Down Slave Controller for Digital Power System Management

Data Sheet Product Selection Table
Part Models
4
1ku List Price
Starting From $2.84
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Part Details

  • 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
LTC3870
PolyPhase Step-Down Slave Controller for Digital Power System Management
Load Transient Response of a 2-Phase Master (3880)/Slave (3870) Converter Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Technical Articles 1

Informational 1

Product Information 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
Buck Regulators with Digital Power System Management 1
LTC3886
LTC3886-1
60V Dual Output Step-Down Controller with Digital Power System Management
External Power Switch Buck Controllers 2
LTC3883
LTC3883-1
Single Phase Step-Down DC/DC Controller with Digital Power System Management
LTC3887
LTC3887-1
LTC3887-2
Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Multiple Output Buck Regulators 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 1

Models for the following parts are available in LTspice:

  • LTC3870
  • LTC3870-1

LTpowerCAD 3

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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
DC2089A-A

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

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Product Details

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.

eval board
schematic 2
schematic 3
schematic 4
schematic 5
schematic 6
DC2089A-B

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

Buy Now View Details

Product Details

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.

eval board
schematic 7
schematic 8
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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Product Details

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.
DC2089A-A
LTC3880EUJ/LTC3870EUFD RSENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A
DC2089A - Schematic
DC2089A-B
LTC3880EUJ/LTC3870EUFD DCR SENSE Demo Board | 7V ≤ VIN ≤ 14V; VOUT = 0.8V to 1.8V @ 80A
DC2089A-B Demo Board DC2089A-B Demo Board DC2089A-B Demo Board DC2089A-B Demo Board DC2089A - Schematic
DC2155A-B
LTC3886UKG/LTC3870UFD Demo Board (RSENSE) | 4 Phase Single Output PMBus Buck 18V≤VIN ≤54V, VOUT=12V at 48A, 150kHz
DC2155A-A-2155A-B Image DC2155A-B - Schematic

Latest Discussions

3 Years Ago
RE: LTC3870 spice model
5 Years Ago
RE: 4 Phase operation for LTC3886
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