LTC3565 - 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter

Features

  • High Efficiency: Up to 95%
  • VIN Range: 2.5V to 5.5V
  • High Frequency Operation: Up to 4MHz
  • Selectable Low Ripple (Typical 25mVp-pBurst Mode® Operation: IQ = 40μA
  • Stable with Ceramic Capacitors
  • Uses Tiny Capacitors and Inductor
  • Low RDS(ON) Internal Switches: 0.15Ω
  • 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 0.6V to 5V
  • Synchronizable to External Clock
  • Supports Pre-Biased Outputs
  • Small 10-Lead (3mm × 3mm) DFN or MSOP Package
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LTC3565 Typical Application
LTC3565 Typical Application

Description

The LTC®3565 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 0.6V to 5.5V. Internal synchronous power switches provide high efficiency. The LTC3565’s current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors.

The LTC3565 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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

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

Part Number Package Code Temp Package
Drawing
RoHS
LTC3565EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3565EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3565EMSE#PBF MS-10E MSE E 05-08-1664 Yes
LTC3565EMSE#TRPBF MS-10E MSE E 05-08-1664 Yes
LTC3565IDD#PBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC3565IDD#TRPBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC3565IMSE#PBF MS-10E MSE I 05-08-1664 Yes
LTC3565IMSE#TRPBF MS-10E MSE I 05-08-1664 Yes


LTC3565 Package Drawing
LTC3565 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3565EDD#PBF 3x3 DFN-10 E $2.86 $2.00 Yes
LTC3565EDD#TRPBF 3x3 DFN-10 E $2.06 Yes
LTC3565EMSE#PBF MS-10E E $2.86 $2.00 Yes
LTC3565EMSE#TRPBF MS-10E E $2.06 Yes
LTC3565IDD#PBF 3x3 DFN-10 I $3.29 $2.30 Yes
LTC3565IDD#TRPBF 3x3 DFN-10 I $2.36 Yes
LTC3565IMSE#PBF MS-10E I $3.29 $2.30 Yes
LTC3565IMSE#TRPBF MS-10E I $2.36 Yes
Buy NowRequest Samples
* 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
DC1159A LTC3565EDD Demo Board | 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter $100.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3565IMSE#PBF MS-10E I $3.29 $2.30 Yes
LTC3565IMSE#TRPBF MS-10E I $2.36 Yes
Buy NowRequest Samples
* 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.

Applications

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

Product Notifications

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Design Tools

LTspice

LTspice® software 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

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
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice 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.

Models for the following parts are available in LTspice:
LTC3565

LTpowerCAD

The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

To open the project file for this circuit:

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

Design tools for the following parts are available in LTpowerCAD:
LTC3565

Technical Support