LTC3875

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. D) Product Selection Table
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Overview

  • 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

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
LTC3875
Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation
LTC3875 Application Circuit LTC3875 Pin Configuration LTC3875 Pin Configuration LTC3875 Performance Graph
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 4

Application Note 1

Technical Articles 2

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2977
RECOMMENDED FOR NEW DESIGNS 8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement
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Tools & Simulations

LTspice 4

Models for the following parts are available in LTspice:

  • LTC3875

LTpowerCAD 2

Design tools for the following parts are available in LTpowerCAD:

  • LTC3875
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
DC2055A

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

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Product Details

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.

eval board
schematic 2
DC2000A

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

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Product Details

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.


 


eval board
schematic 3
DC2142A

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

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Product Details

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.

eval board
schematic 4
DC2225A

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

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Product Details

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.
DC2055A
LTC3875EUJ Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A
DC2055A - Schematic
DC2000A
LTC3875EUJ Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1 = 1.0V @ 30A, VOUT2 = 1.5V @ 30A
DC2000A - Schematic
DC2142A
LTC3875EUJ/LTC3874IUFD Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A
DC2142A
DC2225A
LTC3875EUJ Demo Board | 4-Phase Synchronous Buck Solution, LTC3875 (×2), 4.5V ≤ VIN ≤ 14V; VOUT = 1V @ 160A
DC2225A - Schematic

Latest Discussions

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