LTC3879

PRODUCTION

Fast, Wide Operating Range No RSENSE Step-Down Controller

Data Sheet Product Selection Table
Viewing:

Overview

  • Wide VIN Range: 4V to 38V
  • ±1% 0.6V Voltage Reference
  • Extremely Fast Transient Response
  • tON(MIN): 43ns
  • No RSENSE™ Valley Current Mode Control
  • Stable with Low ESR Ceramic COUT
  • Supports Smooth Start-Up in Pre-Biased Output
  • Optimized for High Step-Down Ratios
  • Adjustable Output Voltage Soft-Start or Tracking
  • Power Good Output Voltage Monitor
  • Dual N-Channel MOSFET Synchronous Drive
  • Adjustable Switching Frequency
  • Programmable Current Limit with Foldback
  • Output Overvoltage Protection
  • 16-Pin MSOP and 3mm × 3mm QFN Packages

The LTC3879 is a synchronous step-down switching regulator controller optimized for high switching frequency and fast transient response. The constant on-time valley current mode architecture allows for a wide input range, including very low duty factor operation. No external sense resistor or slope compensation is required. System flexibility is offered through a user-programmable soft-start pin and independent RUN pin. The voltage ramping soft-start function can be programmed with a capacitor or made to track an external reference source.

Operating frequency is set by an external resistor and compensated for variations in VIN to offer excellent line stability. Discontinuous mode operation provides high efficiency during light load conditions. A forced continuous control pin allows the user to reduce noise and RF interference. Safety features include output overvoltage protection and programmable current limit with foldback. The current limit is user programmable.

The LTC3879 allows operation from 4V to 38V at the input and from 0.6V to 90% VIN at the output. The LTC3879 is available in a small 16-pin thermally enhanced MSOP or 3mm × 3mm QFN packages.

Applications

  • Distributed Power Systems
  • Embedded Computing
  • Communications Infrastructure
LTC3879
Fast, Wide Operating Range No RSENSE Step-Down Controller
High Efficiency Step-Down Converter Efficiency vs Load Current Product Package 1 Product Package 2
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project
Ask a Question

Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Technical Articles 1

Data Sheet

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

Learn More
Add to myAnalog

Add media to the Resources section of myAnalog, to an existing project or to a new project.

Create New Project

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Modal heading
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project

Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3879
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.

Evaluation Kits

eval board
schematic 1
DC1345A

LTC3879EMSE Demo Board | 4.5V ≤ VIN ≤ 34, VOUT = 1.2V @ 12A

Buy Now View Details

Product Details

Demonstration circuit 1345 is a wide input voltage range, no Rsense step-down dc/dc converter featuring the LTC3879EMSE. Its output voltage is 1.2V with a load rating of 12A and the input voltage range is 4.5V to 34V.



eval board
schematic 2
DC1289A

LTC3879EUD Demo Board | No RSENSE, 4.5V ≤ VIN ≤ 14V, VOUT = 1.2V @ 15A

Buy Now View Details

Product Details

Demonstration circuit 1289 is a no RSENSE synchronous step-down DC/DC converter featuring the LTC3879EUD. Its output supplies 1.2V @ 15A and its input voltage range is from 4.5V to 14V.


The LTC3879 allows operation from 4V to 38V at the input and has an output voltage range of 0.6V to 0.9VIN.


 
DC1345A
LTC3879EMSE Demo Board | 4.5V ≤ VIN ≤ 34, VOUT = 1.2V @ 12A
DC1345A - Schematic
DC1289A
LTC3879EUD Demo Board | No RSENSE, 4.5V ≤ VIN ≤ 14V, VOUT = 1.2V @ 15A
DC1289A - Schematic

Latest Discussions

49 Weeks Ago
MOSFET Selections
2 Years Ago
LTC3879 Stability Issue
2 Years Ago
LTC3879 Compensation(Bandwidth,Gain Margin, Phase Margin etc.)
View related discussion on EngineerZone®

Recently Viewed