LTC3875
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LTC3875

Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation

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LTspice LTC3875 - Step-Down (Buck) Regulators Download 6.5 KB LTspice LTC3874/LTC3875 Demo Circuit - High Efficiency, 4-Phase Step-Down Supply with Sub-Milliohm Inductor DCR Sensing (4.5-14V to 1V @ 120A) Download 14.00KB LTspice LTC3875 Demo Circuit - Four-Phase 1.0V, 120A Buck Converter with Ultralow Inductor DCR Sensing (4.5-14V to 1V @ 120A) Download 13.00KB LTspice LTC3875 Demo Circuit - Dual Phase 1.0V, 60A Power System with Ultralow Inductor DCR Sensing (4.5-14V to 1V @ 60A) Download 7.00KB LTspice LTC3875 Demo Circuit - High Efficiency Dual Output Step-Down Converter with Ultralow Inductor DCR Sensing and Fast Transient (4.5-14V to 1V @ 30A & 1.5V @ 30A) Download 8.00KB
Part Models 12
1ku List Price Starting From $4.15
Features
  • Low Value DCR Current Sensing
  • Programmable DCR Temperature Compensation
  • ±0.5% 0.6V Output Voltage Accuracy
  • Dual True Remote Sensing Differential Amplifiers
  • Phase-Lockable Fixed Frequency 250kHz to 720kHz
  • Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • Dual N-Channel MOSFET Synchronous Drive
  • Wide VIN Range: 4.5V to 38V Operation
  • Output Voltage Range with Low DCR: 0.6V to 3.5V, without Low DCR: 0.6V to 5V
  • Adjustable Soft-Start Current Ramping or Tracking
  • Foldback Output Current Limiting
  • Clock Input and Output for Up to 12-Phase Operation
  • Short-Circuit Soft Recovery
  • Output Overvoltage Protection
  • Power Good Output Voltage Monitor
  • 40-Lead QFN Packages
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LTC3875 is a dual output current mode synchronous step-down DC/DC controller that drives all N-channel power MOSFET stages. It employs a unique architecture that enhances the signal-to-noise ratio of the current sense signal, allowing the use of very low DC resistance (DCR) power inductors to maximize efficiency in high current applications. This feature also reduces the switching jitter commonly found in low DCR applications with current mode control.

The LTC3875 features two high speed differential amplifiers which can be used to compensate for the voltage drop from the LTC3875 to the load. Its DCR temperature compensated adjustable over current trip points from 10mV to 30mV limits the maximum output current precisely over temperature.

A unique thermal balancing function adjusts per phase current to minimize the thermal stress for multichip single output applications. The LTC3875 is available in the 40- lead 6mm × 6mm (0.5mm pitch) and 40-lead 5mm × 5mm (0.4mm pitch) QFN packages.

APPLICATIONS

  • Servers and Instruments
  • Telecom Systems
  • DC Power Distribution Systems
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file View Data Sheet (Rev.D)
Documentation View All Documentation
LTspice LTC3875 - Step-Down (Buck) Regulators Download 6.5 KB LTspice LTC3874/LTC3875 Demo Circuit - High Efficiency, 4-Phase Step-Down Supply with Sub-Milliohm Inductor DCR Sensing (4.5-14V to 1V @ 120A) Download 14.00KB LTspice LTC3875 Demo Circuit - Four-Phase 1.0V, 120A Buck Converter with Ultralow Inductor DCR Sensing (4.5-14V to 1V @ 120A) Download 13.00KB LTspice LTC3875 Demo Circuit - Dual Phase 1.0V, 60A Power System with Ultralow Inductor DCR Sensing (4.5-14V to 1V @ 60A) Download 7.00KB LTspice LTC3875 Demo Circuit - High Efficiency Dual Output Step-Down Converter with Ultralow Inductor DCR Sensing and Fast Transient (4.5-14V to 1V @ 30A & 1.5V @ 30A) Download 8.00KB
Part Models 12
1ku List Price Starting From $4.15
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LTC3875

Documentation

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Data Sheet

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UPDATED 12/14/2015
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LTC3875: Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation Data Sheet (Rev.D)

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UPDATED 03/05/2014
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LTC3875: 値の小さいDCRによる検出と温度補償の機能を備えたデュアル2相同期整流式コントローラ データシート

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User Guide

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UPDATED 04/01/2016
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DC2225A - Demo Manual redirect icon

583.00K

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UPDATED 06/05/2014
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DC2142A - Demo Manual redirect icon

759.00K

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UPDATED 03/10/2016
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DC2055A - Demo Manual redirect icon

913.00K

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UPDATED 02/27/2014
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DC2000A - Demo Manual redirect icon

545.00K

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Reliability Data

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UPDATED 03/26/2018
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R526 Reliability Data redirect icon

365.77 K

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Technical Articles

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UPDATED 07/01/2015
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4-Phase Power Supply Delivers 120A in Tiny Footprint, Features Ultralow DCR Sensing for High Efficiency redirect icon

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UPDATED 01/01/2014
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High Efficiency PolyPhase Power Supply Delivers 30A per Phase with Ultralow Inductor DCR Sensing and Fast Transient Response redirect icon

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UPDATED 01/01/2014
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超低インダクタDCRによる検出機能と高速トランジェント応答性能を備えた位相当たり30Aを供給する高効率のPolyPhase 電源 redirect icon

Application Note

3

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UPDATED 09/01/2019
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AN-140: Basic Concepts of Linear Regulator and Switching Mode Power Supplies redirect icon

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UPDATED 09/01/2019
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AN-140：线性调节器和开关模式电源的基本概念 redirect icon

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UPDATED 09/01/2019
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AN-140: リニア・レギュレータとスイッチング電源の基本概念 redirect icon

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Documentation

Technical Documents 9
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Data Sheet 1

LTC3875: Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation Data Sheet (Rev.D)

Reliability Data 1

R526 Reliability Data

User Guide 4

DC2225A - Demo Manual
DC2142A - Demo Manual
DC2055A - Demo Manual
DC2000A - Demo Manual

Application Note 1

AN-140: Basic Concepts of Linear Regulator and Switching Mode Power Supplies

Technical Articles 2

4-Phase Power Supply Delivers 120A in Tiny Footprint, Features Ultralow DCR Sensing for High Efficiency
High Efficiency PolyPhase Power Supply Delivers 30A per Phase with Ultralow Inductor DCR Sensing and Fast Transient Response

Video

2

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Video

2017-09-18

LTC3875 Video Product Brief

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2017-09-18

LTC3874 Video Product Brief

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3875EUH#PBF 40-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3875EUH#TRPBF 40-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3875EUJ#PBF 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3875EUJ#TRPBF 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3875EUJ#WPBF 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3875EUJ#WTRPBF 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3875IUH#PBF 40-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3875IUH#TRPBF 40-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3875IUJ#PBF 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3875IUJ#TRPBF 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3875IUJ#WPBF 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3875IUJ#WTRPBF 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

Software & Part Ecosystem

Parts Product Life Cycle Description

Digital Power System Managers1
LTC2977
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RECOMMENDED FOR NEW DESIGNS

8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement

Evaluation Kits 4

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DC2055A

LTC3875EUJ Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A

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DC2055A

LTC3875EUJ Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A

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DC2055A
LTC3875EUJ Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A
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Product Detail

Demonstration circuit 2055A is a high efficiency, high density, 4-phase synchronous buck converter with a 4.5V to 14V input range. It can supply 120A maximum load current at a 1.0V output. This demo board has two LTC3875EUJ controllers. The LTC3875 is a feature-rich dual-phase synchronous buck controller with very low DCR current sensing capability, on-chip drivers and remote output voltage sensing. This board is set up with 0.32mΩ DCR inductor. The temperature compensation function can guarantee accurate current limit over a wide temperature range with DCR sensing.

Resources

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DC2055A - Demo Manual Download

913.00K

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PDF

DC2055A - Schematic Download

187.00K

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DC2055A - Design Files Download

2.00M

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DC2225A

LTC3875EUJ Demo Board | 4-Phase Synchronous Buck Solution, LTC3875 (×2), 4.5V ≤ VIN ≤ 14V; VOUT = 1V @ 160A

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DC2225A

LTC3875EUJ Demo Board | 4-Phase Synchronous Buck Solution, LTC3875 (×2), 4.5V ≤ VIN ≤ 14V; VOUT = 1V @ 160A

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DC2225A
LTC3875EUJ Demo Board | 4-Phase Synchronous Buck Solution, LTC3875 (×2), 4.5V ≤ VIN ≤ 14V; VOUT = 1V @ 160A
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Product Detail

Demonstration circuit 2225A is a high efficiency, high density, 4-phase synchronous buck converter with a 4.5V to 14V input voltage range. It can supply up to 160A of load current with a 1.0V output. This demo board has two each LTC3875EUJ feature-rich dual phase current mode synchronous buck controllers with very low DCR current sensing capability, on-chip drivers and remote output voltage sensing. This board is set up with 0.32mΩ DCR output inductors. The temperature compensation function offers an option for accurate current limit over a wide temperature range with DCR sensing. To shut down the converter, set the RUN pin voltage below 1V (SW1: OFF). Use JP1 jumper to select Burst Mode® operation, pulse skipping mode or forced continuous mode operation at light load.

Resources

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DC2225A - Design Files Download

1.00M

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DC2225A - Schematic Download

167.00K

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PDF

DC2225A - Demo Manual Download

583.00K

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DC2000A

LTC3875EUJ Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1 = 1.0V @ 30A, VOUT2 = 1.5V @ 30A

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DC2000A

LTC3875EUJ Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1 = 1.0V @ 30A, VOUT2 = 1.5V @ 30A

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DC2000A
LTC3875EUJ Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1 = 1.0V @ 30A, VOUT2 = 1.5V @ 30A
Buy Now View Details

Product Detail

Demonstration circuit 2000A is a high efficiency, high density, synchronous buck converter with a 4.5V to 14V input range. It can supply 30A maximum load current at a 1.0V output and at a 1.5V output separately. The demo board includes a LTC3875EUJ controller. The LTC3875 is a feature-rich dual phase synchronous buck controller with very low DCR current sensing capability, on-chip drivers and remote output voltage sensing. This board is set up with a 0.32mΩ DCR inductor. The temperature compensation function can guarantee accurate current limit over a wide temperature range with DCR sensing.


 


Resources

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PDF

DC2000A - Demo Manual Download

545.00K

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PDF

DC2000A - Schematic Download

144.00K

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DC2000A - Design Files Download

1.00M

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DC2142A

LTC3875EUJ/LTC3874IUFD Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A

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DC2142A

LTC3875EUJ/LTC3874IUFD Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A

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Download

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Print
DC2142A
LTC3875EUJ/LTC3874IUFD Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A
Buy Now View Details

Product Detail

Demonstration circuit 2142A is a high efficiency, high density, 4-phase synchronous buck converter with a 4.5V to 14V input range. It can supply 120A maximum load current at a 1.0V output. This demo board incorporates the LTC3875EUJ and LTC3874IUFD master/slave controllers.

Resources

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ZIP

DC2142A - Design Files Download

6.00M

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PDF

DC2142A - Demo Manual Download

759.00K

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PDF

DC2142A - Schematic Download

140.00K

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Evaluation Kits4

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DC2055A

LTC3875EUJ Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A
evaluation kit item images

DC2225A

LTC3875EUJ Demo Board | 4-Phase Synchronous Buck Solution, LTC3875 (×2), 4.5V ≤ VIN ≤ 14V; VOUT = 1V @ 160A
evaluation kit item images

DC2000A

LTC3875EUJ Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1 = 1.0V @ 30A, VOUT2 = 1.5V @ 30A
evaluation kit item images

DC2142A

LTC3875EUJ/LTC3874IUFD Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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LTC3875 - Step-Down (Buck) Regulators Download

6.5 K

spice tool Lt Spice

LTC3874/LTC3875 Demo Circuit - High Efficiency, 4-Phase Step-Down Supply with Sub-Milliohm Inductor DCR Sensing (4.5-14V to 1V @ 120A) Download

14.00K

spice tool Lt Spice

LTC3875 Demo Circuit - Four-Phase 1.0V, 120A Buck Converter with Ultralow Inductor DCR Sensing (4.5-14V to 1V @ 120A) Download

13.00K

spice tool Lt Spice

LTC3875 Demo Circuit - Dual Phase 1.0V, 60A Power System with Ultralow Inductor DCR Sensing (4.5-14V to 1V @ 60A) Download

7.00K

spice tool Lt Spice

LTC3875 Demo Circuit - High Efficiency Dual Output Step-Down Converter with Ultralow Inductor DCR Sensing and Fast Transient (4.5-14V to 1V @ 30A & 1.5V @ 30A) Download

8.00K

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