LTC3564 - 2.25MHz, 1.25A Synchronous Step-Down Regulator
Features
- 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
Typical Application
Description
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.
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 |
|---|---|---|---|---|---|
| LTC3564EDCB#TRMPBF | 2x3 DFN-6 | DCB | E | 05-08-1715 | Yes |
| LTC3564EDCB#TRPBF | 2x3 DFN-6 | DCB | E | 05-08-1715 | Yes |
| LTC3564ES5#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC3564ES5#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC3564IDCB#TRMPBF | 2x3 DFN-6 | DCB | I | 05-08-1715 | Yes |
| LTC3564IDCB#TRPBF | 2x3 DFN-6 | DCB | I | 05-08-1715 | Yes |
| LTC3564IS5#PBF | SOT-23 | S5 | I | 05-08-1635 | Yes |
| LTC3564IS5#TRMPBF | SOT-23 | S5 | I | 05-08-1635 | Yes |
| LTC3564IS5#TRPBF | SOT-23 | S5 | I | 05-08-1635 | Yes |
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 | |
|---|---|---|---|---|---|---|
| LTC3564EDCB#TRMPBF | 2x3 DFN-6 | E | $2.79 | $2.00 | Yes | |
| LTC3564EDCB#TRPBF | 2x3 DFN-6 | E | $2.79 | $1.95 | Yes | |
| LTC3564ES5#TRMPBF | SOT-23 | E | $2.79 | $2.00 | Yes | |
| LTC3564ES5#TRPBF | SOT-23 | E | $2.79 | $1.95 | Yes | |
| LTC3564IDCB#TRMPBF | 2x3 DFN-6 | I | $3.20 | $2.29 | Yes | |
| LTC3564IDCB#TRPBF | 2x3 DFN-6 | I | $3.20 | $2.24 | Yes | |
| LTC3564IS5#PBF | SOT-23 | I | $3.20 | Yes | ||
| LTC3564IS5#TRMPBF | SOT-23 | I | $3.20 | $2.29 | Yes | |
| LTC3564IS5#TRPBF | SOT-23 | I | $3.20 | $2.24 | Yes | |
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|
| DC1158A | LTC3564ES5 Demo Board (TSOT) | 2.25MHz, 2.5V ≤ VIN ≤ 5.5V, Vout = 1.2V/1.5V/1.8V @ 1.25A | $75.00 | |
| DC1343A | LTC3564DCB6 Demo Board (DFN) | 2.25MHz, 2.5V ≤ VIN ≤ 5.5V, Vout = 1.2V/1.5V/1.8V @ 1.25A | Contact Factory | |
| Buy Now | |||
Applications
- Cellular Telephones
- Wireless and DSL Modems
- Digital Still Cameras
- Media Players
- Portable Instruments
- Point of Load Regulation
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Design Tools
LTspice
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LTC3564
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.
