LTC6909 - 1 to 8 Output, Multiphase Oscillator with Spread Spectrum Modulation

LTC2935 - Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds

LTC2974 - 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement

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

Features

High Efficiency: Up to 95%
V_IN Range: 2.5V to 5.5V
High Frequency Operation: Up to 4MHz
Selectable Low Ripple (Typical 25mVp-p) Burst Mode® Operation: I_Q = 40μA
Stable with Ceramic Capacitors
Uses Tiny Capacitors and Inductor
Low R_DS(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: I_Q ≤ 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

Typical Application

Description

The LTC3565 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 (I_Q = 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

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

DFN-10, MS-10

Order Info

Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
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	Pins	Temp	Price (1-99)	Price (1k)^*	RoHS Data
LTC3565EDD#PBF	DFN	10	E	$2.86	$2.00	View
LTC3565EDD#TRPBF	DFN	10	E		$2.06	View
LTC3565EMSE#PBF	MSOP	10	E	$2.86	$2.00	View
LTC3565EMSE#TRPBF	MSOP	10	E		$2.06	View
LTC3565IDD#PBF	DFN	10	I	$3.29	$2.30	View
LTC3565IDD#TRPBF	DFN	10	I		$2.36	View
LTC3565IMSE#PBF	MSOP	10	I	$3.29	$2.30	View
LTC3565IMSE#TRPBF	MSOP	10	I		$2.36	View
Buy Now • Request 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	Design File Manual Schematic ltspice
Buy Now

Click here to view our complete list of demo boards

Applications

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

People Who Viewed This Product Also Viewed

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

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
- LTC3565 Demo Circuit - 1.25A, 4MHz, Synchronous Step-Down Converter (Li-Ion to 1.8V @ 1.25A)
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
LTC3565

Technical Support

For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.