LTC3411A

PRODUCTION

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

Data Sheet (Rev. E) Product Selection Table
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Overview

  • Uses Tiny Capacitors and Inductor
  • High Frequency Operation: Up to 4MHz
  • Low RDS(ON) Internal Switches: 0.15Ω
  • High Efficiency: Up to 96%
  • Selectable Low Ripple (25mVP-P) Burst Mode® Operation: IQ = 40µA
  • 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
  • Output Voltages from 0.8V to 5V
  • Synchronizable to External Clock
  • Supports Prebiased Outputs
  • Small 10-Lead 3mm × 3mm DFN or MSOP Package

The LTC3411A is a constant frequency, synchronous step-down DC/DC converter. Intended for medium power applications, it operates from a 2.5V 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 1mm or less in height. The output voltage is adjustable from 0.8V to 5.5V. Internal synchronous power switches provide high efficiency. The LTC3411A’s current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors.

The LTC3411A can be configured for automatic power saving Burst Mode operation (IQ = 40µA) 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). In shutdown, the device draws <1µA.

Applications

  • Notebook Computers
  • Digital Cameras
  • Cellular Phones
  • Handheld Instruments
  • Board Mounted Power Supplies
LTC3411A
1.25A, 4MHz, Synchronous Step-Down DC/DC Converter
Step-Down 2.5V/1.25A Regulator Efficiency and Power Loss vs Output Current Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Oscillators 1
LTC6908
Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
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
LTC4365
RECOMMENDED FOR NEW DESIGNS Overvoltage, Undervoltage and Reverse Supply Protection Controller
Supervisory Circuits & Reset ICs 1
LTC2935
PRODUCTION Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
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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
schematic 1
DC1176A

LTC3411AEDD Demo Board | 2.5V ≤ VIN ≤ 5.5V, VOUT = 1.8V/2.5V/3.3V @ 1.25A

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Product Details

Demonstration circuit 1176 is a step-down converter, using the LTC3411A monolithic synchronous buck regulator. The DC1176 has an input voltage range of 2.5V to 5.5V, and is capable of delivering up to 1.25A of output current. The output voltage of the DC1176 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 LTC3411A.
DC1176A
LTC3411AEDD Demo Board | 2.5V ≤ VIN ≤ 5.5V, VOUT = 1.8V/2.5V/3.3V @ 1.25A
DC1176A - Schematic

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