LTC3561 - 1A, 4MHz, Synchronous Step-Down DC/DC Converter
Features
- Uses Tiny Capacitors and Inductor
- High Frequency Operation: Up to 4MHz
- High Switch Current: 1.4A
- Low Rds(ON) Internal Switches: 0.110Ω
- High Efficiency: Up to 95%
- VIN: 2.63V to 5.5V
- 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: 240µA
- Output Voltages from 0.8V to 5V
- Low Noise Pulse-Skipping Operation
- Small 8-Pin DFN Package
Typical Application
Description
The LTC3561 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 synchronous 0.11Ω power switches with 1.4A peak current ratings provide high efficiency. The LTC3561’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). The no-load quiescent current is only 240µA. 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
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 |
|---|---|---|---|---|---|---|
| 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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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.Click here to view our complete list of demo boards
Applications
- Wireless LAN Power
- Notebook Computers
- Digital Cameras
- Cellular Phones
- 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
- 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.
