LTC3441 - High Current Micropower Synchronous Buck-Boost DC/DC Converter

Features

  • Regulated Output with Input Above, Below or Equal to the Output
  • Single Inductor, No Schottky Diodes
  • High Efficiency: Up to 95%
  • 25µA Quiescent Current in Burst Mode® Operation
  • Up to 1.2A Continuous Output Current from a Single Lithium-Ion
  • True Output Disconnect in Shutdown
  • 2.4V to 5.5V Input Range
  • 2.4V to 5.25V Output Range
  • 1MHz Fixed Frequency Operation
  • Synchronizable Oscillator
  • Selectable Burst Mode or Fixed Frequency Operation
  • <1µA Quiescent Current in Shutdown
  • Small, Thermally Enhanced 12-Lead (4mm x 3mm) DFN package

Typical Application

LTC3441 Typical Application
LTC3441 Typical Application

Description

The LTC3441 is a high efficiency, fixed frequency, buck-boost DC/DC converter that operates efficiently 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 lithium ion or multi-cell applications where the output voltage is within the battery voltage range.

The device includes two 0.10 Ohm N-channel MOSFET switches and two 0.11 Ohm P-channel switches. External Schottky diodes are optional, and can be used for a moderate efficiency improvement. The operating frequency is internally set to 1MHz and can be synchronized up to 1.7MHz. Quiescent current is only 25µA in Burst Mode operation, maximizing battery life in portable applications. Burst Mode operation is user controlled and can be enabled by driving the MODE/SYNC pin high. If the MODE/ SYNC pin is driven low or with a clock, then fixed frequency switching is enabled.

Other features include a 1µA shutdown, soft-start control, thermal shutdown and current limit. The LTC3441 is available in a thermally enhanced 12-lead (4mm x 3mm) DFN package.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

4x3 DFN-12

LTC3441 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3441EDE DFN 12 E $5.07 $3.55 View
LTC3441EDE#PBF DFN 12 E $5.07 $3.55 View
LTC3441EDE#TR DFN 12 E $3.65 View
LTC3441EDE#TRPBF DFN 12 E $3.65 View
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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
DC625A LTC3441EDE | 1MHz, 1A, Synchronous Buck-Boost Converter, 2.5 to 5.5Vin, 3.3Vout @ 1A $150.00
DC773A LTC3441EDE | Synchronous 1 MHz Luxeon III White LED Driver, Vin = 3V - 4.2V $150.00
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Click here to view our complete list of demo boards

Applications

  • Handheld Computers
  • Handheld Instruments
  • MP3 Players
  • Digital Cameras

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Design Tools

LTspiceIV

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Models for the following parts are available in LTspice IV:
LTC3441

Technical Support