LTC3539/LTC3539-2 - 2A, 1MHz/2MHz Synchronous Step-Up DC/DC Converters

Features

  • Delivers 3.3V at 900mA From 2 Alkaline/NiMH Cells
  • Delivers 5V at 900mA From a Lithium-Polymer Battery
  • VIN Start-Up Voltage: 700mV
  • 1.5V to 5.25V VOUT Range
  • Up to 94% Efficiency
  • VIN > VOUT Operation
  • ±1.5% Feedback Voltage Tolerance
  • 1MHz (LTC3539) or 2MHz (LTC3539-2) Fixed Frequency Operation
  • Output Disconnect
  • Selectable Burst Mode® or PWM Operation
  • 10μA Quiescent Current
  • Logic Controlled Shutdown: <1μA
  • Requires Only 6 External Components
  • Low Profile (2mm × 3mm × 0.75mm) DFN Package

Typical Application

LTC3539 Typical Application
LTC3539 Typical Application

Description

The LTC®3539/LTC3539-2 are synchronous, 2A step-up DC/DC converters with output disconnect. Synchronous rectification enables high efficiency in the low profile 2mm × 3mm DFN package. Battery life is extended with a 700mV start-up voltage and operation down to 500mV once started.

A switching frequency of 1MHz (LTC3539) or 2MHz (LTC3539-2) minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The current mode PWM design is internally compensated, reducing external parts count. The LTC3539/LTC3539-2 feature a pin-enabled automatic Burst Mode operation at light load conditions. Anti-ring circuitry reduces EMI by damping the inductor in discontinuous mode. Additional features include a low shutdown current of under 1μA and thermal overload protection.

The LTC3539/LTC3539-2 are offered in a 2mm × 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
LTC3539EDCB-2#PBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LTC3539EDCB-2#TRMPBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LTC3539EDCB-2#TRPBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LTC3539EDCB#PBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LTC3539EDCB#TRMPBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LTC3539EDCB#TRPBF 2x3 DFN-8 DCB E 05-08-1718 Yes


LTC3539 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
LTC3539EDCB-2#PBF 2x3 DFN-8 E $3.57 Yes
LTC3539EDCB-2#TRMPBF 2x3 DFN-8 E $3.57 $2.55 Yes
LTC3539EDCB-2#TRPBF 2x3 DFN-8 E $3.57 $2.50 Yes
LTC3539EDCB#PBF 2x3 DFN-8 E $3.57 Yes
LTC3539EDCB#TRMPBF 2x3 DFN-8 E $3.57 $2.55 Yes
LTC3539EDCB#TRPBF 2x3 DFN-8 E $3.57 $2.50 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
DC1260A-A LTC3539EDCB Demo Board | 1MHz, 0.7V ≤ VIN ≤ 5.5V, VOUT = 1.8V/3.3V/5V @ 0.9A $100.00
DC1260A-B LTC3539EDCB-2 Demo Board | 2MHz, 0.7V ≤ VIN ≤ 5.5V, VOUT = 1.8V/3.3V/5V @ 0.9A $100.00
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Click here to view our complete list of demo boards

Applications

  • Medical Instruments
  • Portable Bar Code Scanners
  • Noise Canceling Headphones
  • Portable GPS Navigation
  • Handheld PCs

Product Notifications

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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 IV:
LTC3539
LTC3539-2

Technical Support