LTC3867 - Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control

Features

  • 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

Typical Application

LTC3867 Typical Application
LTC3867 Typical Application

Description

The LTC®3867 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

QFN-24

LTC3867 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3867EUF#PBF QFN 24 E $3.79 $2.65 View
LTC3867EUF#TRPBF QFN 24 E $2.71 View
LTC3867IUF#PBF QFN 24 I $4.26 $2.98 View
LTC3867IUF#TRPBF QFN 24 I $3.04 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1771A LTC3867EUF Demo Board | 4.5 ≤ VIN ≤ 14V, VOUT = 1.5V @ 15A. $125.00
DC1928A LTC3867EUF Demo Board | 18V ≤ Vin ≤ 36V; Vout = 12V @ 12A. Contact Factory
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Click here to view our complete list of demo boards

Applications

  • Automotive Systems
  • Telecom Systems
  • Industrial Equipment
  • Distributed DC Power Systems

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Design Tools

LTspiceIV

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

Models for the following parts are available in LTspice IV:
LTC3867

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