LTC3564 - 2.25MHz, 1.25A Synchronous Step-Down Regulator


  • 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

LTC3564 Typical Application
LTC3564 Typical Application


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.


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
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

LTC3564 Package Drawing
LTC3564 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
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
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* 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
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
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Click here to view our complete list of demo boards


  • Cellular Telephones
  • Wireless and DSL Modems
  • Digital Still Cameras
  • Media Players
  • Portable Instruments
  • Point of Load Regulation

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Design Tools


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

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