LTC3867

RECOMMENDED FOR NEW DESIGNS

Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control

Data Sheet Product Selection Table
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Overview

  • VIN Range: 4V to 38V
  • VOUT Range: 0.6V to 14V
  • Nonlinear Control Architecture Minimizes Output Transient Excursions (Optional)
  • Programmable DCR Temperature Compensation
  • ±0.75% 0.6V Voltage Reference
  • Fixed Frequency Range of 200kHz to 1.2MHz
  • PLL Frequency Synchronization
  • RSENSE or DCR Current Sensing
  • Differential Remote Output Voltage Sense
  • Supports Smooth Start-Up into Pre-Biased Outputs
  • Programmable Soft-Start or VOUT Tracking
  • Hiccup Mode/Soft Recovery from Output Overcurrent
  • 24-Lead (4mm × 4mm) QFN Package

The LTC3867 is a current mode synchronous step-down switching regulator controller that drives all N-channel power MOSFET stages. Output voltage transient excursions are minimized by use of a nonlinear control architecture to eliminate clock latency issues.

The maximum current sense voltage is programmable from 30mV to 75mV, allowing the use of either a discrete sense resistor or the inductor DCR as the sensing element. Programmable DCR temperature compensation allows constant current limit regardless of inductor temperature. Programmable inductor temperature-based thermal shutdown protects the power components from thermal stress. Soft recovery from output shorts or overcurrent minimizes output overshoot.

The LTC3867 features a precision 0.6V reference and can regulate output voltages up to 14V from a wide 4V to 38V input supply range. The LTC3867 includes a high speed differential remote sense amplifier. Burst Mode® operation, continuous and pulse-skipping modes are supported. The LTC3867 is available in a 24-lead (4mm × 4mm) QFN package.

Applications

  • Automotive Systems
  • Telecom Systems
  • Industrial Equipment
  • Distributed DC Power Systems
LTC3867
Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control
High Efficiency Synchronous Step-Down Controller Efficiency and Power Loss Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Data Sheet

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

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
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Protection Switches & Controllers 2
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LTC4359
RECOMMENDED FOR NEW DESIGNS Ideal Diode Controller with Reverse Input Protection
Switching Regulators & Controllers 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

Models for the following parts are available in LTspice:

  • LTC3867

LTpowerCAD 4

Design tools for the following parts are available in LTpowerCAD:

  • LTC3867
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
DC1928A

LTC3867EUF Demo Board | 18V ≤ VIN ≤ 36V; VOUT = 12V @ 12A

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Product Details

Demonstration circuit 1928A is a single output synchronous buck converter featuring the LTC3867EUF in a 24-lead 4mm x 4mm QFN package. The input voltage range is from 18V to 36V.

eval board
schematic 2
DC1771A

LTC3867EUF Demo Board | 4.5 ≤ VIN ≤ 14V, VOUT = 1.5V @ 15A

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Product Details

Demonstration circuit 1771A is a single output synchronous buck converter featuring the LTC3867EUF with a 24-lead 4mm × 4mm QFN package. The input voltage range is from 4.5V to 14V and it provides 1.5V at 15A at the output. The DC1771A is configured with a sense resistor.


DCR sensing circuit is optional. Using the inductor’s DCR as the sense element instead of the on-board sense resistor saves cost and board space while improving full-load efficiency over 2%, though the sense resistor provides a more accurate current limit.
DC1928A
LTC3867EUF Demo Board | 18V ≤ VIN ≤ 36V; VOUT = 12V @ 12A
DC1928A - Schematic
DC1771A
LTC3867EUF Demo Board | 4.5 ≤ VIN ≤ 14V, VOUT = 1.5V @ 15A
DC1771A - Schematic

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