LTC3533 - 2A Wide Input Voltage Synchronous Buck-Boost DC/DC Converter

Features

  • Regulated Output with Input Voltages Above, Below or Equal to the Output
  • 1.8V to 5.5V (Input) and 5.25V (Output) Voltage Range
  • 0.8A Continuous Output Current: VIN > 1.8V
  • 2A Continuous Output Current: VIN > 3V
  • Single Inductor
  • Synchronous Rectification: Up to 96% Efficiency
  • Programmable Burst Mode Operation: IQ = 40µA
  • Output Disconnect in Shutdown
  • Programmable Frequency from 300kHz to 2MHz
  • <1µA Shutdown Current
  • Small Thermally Enhanced 14-Lead (3mm × 4mm × 0.75mm) DFN package

Typical Application

LTC3533 Typical Application
LTC3533 Typical Application

Description

The LTC3533 is a wide VIN range, highly efficient, fixed frequency, buck-boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for single cell lithium-ion/polymer or multi-cell alkaline/NiMH applications where the output voltage is within the input voltage range.

The LTC3533 features programmable Burst Mode operation, extended VIN and VOUT ranges down to 1.8V, and increased output current. Switching frequencies up to 2MHz are programmed with an external resistor. The Burst Mode threshold is programmed with a single resistor from the BURST pin to GND.

Other features include 1µA shutdown current, short circuit protection, programmable soft-start, current limit and thermal shutdown. The LTC3533 is housed in the thermally enhanced 14-lead (3mm × 4mm × 0.75mm) DFN package.

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
LTC3533EDE#PBF 4x3 DFN-14 DE E 05-08-1708 Yes
LTC3533EDE#TRPBF 4x3 DFN-14 DE E 05-08-1708 Yes


LTC3533 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
LTC3533EDE#PBF 4x3 DFN-14 E $5.07 $3.55 Yes
LTC3533EDE#TRPBF 4x3 DFN-14 E $3.61 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
DC999A LTC3533EDE Demo Board | High Efficiency Synchronous Buck-Boost Converter $150.00
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Click here to view our complete list of demo boards

Applications

  • GSM Modems
  • Handheld Instruments
  • Digital Cameras
  • Smart Phones
  • Media Players
  • Miniature Hard Disk Drive Power

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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

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
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice 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.

Models for the following parts are available in LTspice:
LTC3533

Technical Support