Power Management Switching Regulator Step-Down (Buck) Regulators Micropower Buck Regulators
Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck

LTC2934 - Ultra-Low Power Adjustable Supervisor with Power-Fail Output

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

LTC3563 - 500mA, Synchronous Step-Down DC/DC Converter with Selectable Output Voltage

Features

  • High Efficiency: Up to 96%
  • Pin Selectable Output Voltage: 1.28V/1.87V
  • Low Ripple (<20mVP-P) Burst Mode® Operation:
      IQ = 26µA
  • Very Low Quiescent Current: Only 26µA
  • 2.5V to 5.5V Input Voltage Range
  • 2.25MHz Constant Frequency Operation
  • Low Dropout Operation: 100% Duty Cycle
  • No Schottky Diode Required
  • Internal Soft-Start Limits Inrush Current
  • Shutdown Mode Draws <1µA Supply Current
  • ±2% Output Voltage Accuracy
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Overtemperature Protected
  • Available in 2mm × 2mm 6-Lead DFN

Typical Application

LTC3563 Typical Application
LTC3563 Typical Application

Description

The LTC3563 is a high efficiency monolithic synchronous buck converter using a constant frequency, current mode architecture. A voltage select input allows the user to program the output voltage to 1.28V or 1.87V. Supply current during operation is only 26µA, dropping to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3563 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Internal power switches are optimized to provide high efficiency and eliminate the need for an external Schottky diode.

The switching frequency is internally set at 2.25MHz, allowing the use of small surface mount inductors and capacitors. The LTC3563 is specifically designed to work well with ceramic output capacitors, achieving very low output voltage ripple and a small PCB footprint.

The LTC3563 is configured for the power saving Burst Mode Operation.

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
LTC3563EDC#PBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3563EDC#TRMPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3563EDC#TRPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes


LTC3563 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
(1-99)		 Price
(1k)*		 RoHS
LTC3563EDC#PBF 2x2 DFN-6 E $2.29 Yes
LTC3563EDC#TRMPBF 2x2 DFN-6 E $2.29 $1.65 Yes
LTC3563EDC#TRPBF 2x2 DFN-6 E $2.29 $1.60 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.

Click here to view our complete list of demo boards

Applications

  • Cellular Telephones
  • Wireless and DSL Modems
  • Digital Cameras
  • MP3 Players
  • PDAs and Other Handheld Devices

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Design Tools

LTspice

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

Models for the following parts are available in LTspice:
LTC3563

Technical Support