LTC3875
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3875

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
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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Documentation

Documentation

Video

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3875EUH#PBF
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LTC3875EUJ#PBF
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LTC3875EUJ#WPBF
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LTC3875EUJ#WTRPBF
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LTC3875IUH#PBF
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LTC3875IUH#TRPBF
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LTC3875IUJ#PBF
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LTC3875IUJ#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

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

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

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.

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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

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

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.

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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

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

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.


 


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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

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

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.

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.

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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