Features and Benefits
- High Efficiency: Up to 96%
- Very Low Quiescent Current: Only 20μA
- 1.25A Output Current
- 2.5V to 5.5V Input Voltage Range
- 2.25MHz Constant Frequency Operation
- No Schottky Diode Required
- Low Dropout Operation: 100% Duty Cycle
- 0.6V Reference Allows Low Output Voltages
- Shutdown Mode Draws ≤ 1μA Supply Current
- Current Mode Operation for Excellent Line and
- Load Transient Response
- Overtemperature Protected
- Low Profile (1mm) ThinSOT™ and 6-Lead (2mm × 3mm) DFN Packages
The LTC3564 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 20μA, dropping to ≤1μA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3564 ideally suited for single Li-Ion battery-powered or 3.3V to 5V input voltage applications. 100% duty cycle provides low drop- out operation, extending battery life in portable systems. Automatic Burst Mode® operation increases efficiency at light loads, further extending battery runtime.
Switching frequency is internally set at 2.25MHz, allowing the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The LTC3564 is available in low profile (1mm) ThinSOT and 6-Lead (2mm × 3mm) DFN packages.
- Cellular Telephones
- Wireless and DSL Modems
- Digital Still Cameras
- Media Players
- Portable Instruments
- Point of Load Regulation
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Demonstration circuit DC1343A is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture featuring LTC3564 in the 2×3 DFN-6 package. The demo board features a 2.5V to 5.5V input voltage range and provides a jumper-selectable 1.2V/1.5V/1.8V output at 1.25A. Its high switching frequency of 2.25MHz allows the use of small surface mount inductors and capacitors.
Demonstration circuit DC1158A is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture featuring LTC3564 in the ThinSOT package. The demo board features a 2.5V to 5.5V input voltage range and provides a jumper-selectable 1.2V/1.5V/1.8V output at 1.25A. Its high switching frequency of 2.25MHz allows the use of small surface mount inductors and capacitors.
Tools & Simulations
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, 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.
Models for the following parts are available in LTspice:
Technical Articles (1)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.