Power Management Switching Regulator Step-Down (Buck) Regulators Micropower Buck
Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck

LTC3561A - 1A, 4MHz, Synchronous Step-Down DC/DC Converter

Features

  • Uses Tiny Capacitors and Inductor
  • High Frequency Operation: Up to 4MHz
  • Low RDS(ON) Internal Switches: 0.15Ω
  • High Efficiency: Up to 96%
  • 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: 330μA
  • Output Voltages from 0.8V to 5V
  • VIN: 2.5V to 5.5V
  • Small 8-Lead 3mm × 3mm DFN Package

Typical Application

LTC3561A Typical Application
LTC3561A Typical Application

Description

The LTC3561A 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 LTC3561A’s current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors.

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

Packaging

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

DFN-8

LTC3561A Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3561AEDD#PBF DFN 8 E $2.50 $1.75 View
LTC3561AEDD#TRPBF DFN 8 E $1.81 View
LTC3561AIDD#PBF DFN 8 I $2.87 $2.01 View
LTC3561AIDD#TRPBF DFN 8 I $2.06 View
LTC3561EDD DFN 8 E $3.57 $2.50 View
LTC3561EDD#PBF DFN 8 E $3.57 $2.50 View
LTC3561EDD#TR DFN 8 E $2.56 View
LTC3561EDD#TRPBF DFN 8 E $2.56 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 demo boards are offered free of charge to qualified customers. Contact your local sales office or distributor to request 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
DC1072B LTC3561AEDD Demo Board | 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter $100.00
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Click here to view our complete list of demo boards

Applications

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

Simulate

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. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As". After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Related models available in LTspice IV
LTC3561
LTC3561A

Technical Support