LTC3411

PRODUCTION

1.25A, 4MHz, Synchronous Step-Down DC/DC Converter

Viewing:

Overview

  • Small 10-Lead MSOP or DFN Package
  • Uses Tiny Capacitors and Inductor
  • High Frequency Operation: Up to 4MHz
  • High Switch Current: 1.6A
  • Low RDS(ON) Internal Switches: 0.110Ω
  • High Efficiency: Up to 95%
  • Stable with Ceramic Capacitors
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Short-Circuit Protected
  • Low Dropout Operation: 100% Duty Cycle
  • Low Shutdown Current: IQ ≤ 1μA
  • Low Quiescent Current: 60µA
  • Output Voltages from 0.8V to 5V
  • Selectable Burst Mode® Operation
  • Sychronizable to External Clock

The LTC3411 is a constant frequency, synchronous, step- down DC/DC converter. Intended for medium power applications, it operates from a 2.63V to 5.5V input voltage range and has a user configurable operating frequency up to 4MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. The output voltage is adjustable from 0.8V to 5V. Internal sychronous 0.11Ω power switches with 1.6A peak current ratings provide high efficiency. The LTC3411’s current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors.

The LTC3411 can be configured for automatic power saving Burst Mode operation to reduce gate charge losses when the load current drops below the level required for continuous operation. For reduced noise and RF interference, the SYNC/MODE pin can be configured to skip pulses or provide forced continuous operation.

To further maximize battery life, the P-channel MOSFET is turned on continuously in dropout (100% duty cycle) with a low quiescent current of 60μA. In shutdown, the device draws <1μA.

Applications

  • Notebook Computers
  • Digital Cameras
  • Cellular Phones
  • Handheld Instruments
  • Board Mounted Power Supplies

LTC3411
1.25A, 4MHz, Synchronous Step-Down DC/DC Converter
Figure 1. Step-Down 2.5V/1.25A Regulator 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

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
LTC3411A PRODUCTION 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter
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:

  • LTC3411
  • LTC3411A

LTpowerCAD 1


Design tools for the following parts are available in LTpowerCAD:

  • LTC3411
  • LTC3411A
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
DC441A

LTC3411EMS | 2.65V ≤ VIN ≤ 5.5V, VOUT = 1.8V/2.5V/3.3V @ 1.25A

Product Details

Demonstration circuit 441 is a constant-frequency stepdown converter, using the LTC3411 monolithic synchronous buck regulator. The DC441 has an input voltage range of 2.65V to 5.5V, and is capable of delivering up to 1.25A of output current. See the LTC3411A for input voltages down to 2.5V. The output voltage of the DC441 can be set to 1.8V, 2.5V or 3.3V using the appropriate jumper connection, or it can be set to an adjustable value down to 0.8V, the reference voltage of the LTC3411.

DC441A
LTC3411EMS | 2.65V ≤ VIN ≤ 5.5V, VOUT = 1.8V/2.5V/3.3V @ 1.25A
DC441A - Schematic

Latest Discussions

Recently Viewed