LTC3442 - Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation

Features

  • Regulated Output with Input Voltages Above, Below, or Equal to the Output
  • Single Inductor, No Schottky Diodes Required
  • Manual or Programmable Automatic Burst Mode Operation
  • Programmable Average Input Current Limit
  • Up to 1.2A Continuous Output Current from a Single Lithium-Ion Cell
  • High Efficiency: Up to 95%
  • Output Disconnect in Shutdown
  • 2.4V to 5.5V Input Range
  • 2.4V to 5.25V Output Range
  • 35µA Quiescent Current in Burst Mode Operation
  • Programmable Frequency from 300kHz to 2MHz
  • <1µA Shutdown Current
  • Small, Thermally Enhanced 12-Lead (4mm × 3mm) DFN Package

Typical Application

LTC3442 Typical Application
LTC3442 Typical Application

Description

The LTC3442 is a highly efficient, fixed frequency, Buck-Boost DC/DC converter, which operates from input voltages above, below, and 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 a single Lithium-Ion or multicell alkaline applications where the output voltage is within the battery voltage range.

The device includes two 0.10 Ohm N-channel MOSFET switches and two 0.10 Ohm P-channel switches. Operating frequency and average input current limit can each be programmed with an external resistor. Quiescent current is only 35µA in Burst Mode operation, maximizing battery life in portable applications. Automatic Burst Mode operation allows the user to program the load current for Burst Mode operation, or to control it manually.

Other features include 1µA shutdown current, programmable soft-start, peak current limit and thermal shutdown. The LTC3442 is available in a low profile, thermally enhanced 12-lead (4mm × 3mm × 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
LTC3442EDE#PBF 4x3 DFN-12 DE/UE E 05-08-1695 Yes
LTC3442EDE#TRPBF 4x3 DFN-12 DE/UE E 05-08-1695 Yes


LTC3442 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
LTC3442EDE#PBF 4x3 DFN-12 E $4.70 $3.95 Yes
LTC3442EDE#TRPBF 4x3 DFN-12 E $4.05 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
DC799A LTC3442EDE Demo Board | Synchronous Buck-Boost, 2.4V ≤ VIN ≤ 5.25V, VOUT = 3.3V @ 1.2A $100.00
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Click here to view our complete list of demo boards

Applications

  • PDA/'SMART' Phones
  • Handheld Computers
  • MP3 Players
  • Handheld Instruments
  • Digital Cameras
  • Wireless Handsets
  • USB Peripherals

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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:
LTC3442

Technical Support