LTC3526-2 - 500mA 2MHz Synchronous Step-Up DC/DC Converter in 2mm x 2mm DFN

Features

  • Delivers 3.3V at 100mA from a Single Alkaline/ NiMH Cell or 3.3V at 200mA from Two Cells
  • VIN Start-Up Voltage: 850mV
  • VIN Operating Range: 0.5V to 5V
  • 1.6V to 5.25V VOUT Range
  • Up to 94% Efficiency
  • Output Disconnect
  • 2MHz Fixed Frequency Operation
  • VIN > VOUT Operation
  • Integrated Soft-Start
  • Current Mode Control with Internal Compensation
  • Burst Mode® Operation with 9μA Quiescent Current (LTC3526-2)
  • Low Noise PWM Operation (LTC3526B-2)
  • Internal Synchronous Rectifier
  • Logic Controlled Shutdown (IQ < 1μA)
  • Anti-Ringing Control
  • Low Profile (2mm × 2mm × 0.75mm) DFN-6 Package

Typical Application

LTC3526-2 Typical Application
LTC3526-2 Typical Application

Description

The LTC3526-2/LTC3526B-2 are synchronous, fixed frequency step-up DC/DC converters with output disconnect. Synchronous rectification enables high efficiency in the low profile 2mm × 2mm DFN package. Battery life in single AA/AAA powered products is extended further with an 850mV start-up voltage and operation down to 500mV once started.

A switching frequency of 2MHz 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 LTC3526-2 features Burst Mode operation at light load conditions, while the LTC3526B-2 features continuous switching. Anti-ring circuitry eliminates EMI concerns by damping the inductor in discontinuous mode. Additional features include a low shutdown current of under 1μA and thermal shutdown.

The LTC3526-2/LTC3526B-2 are housed in a 6-pin 2mm × 2mm × 0.75mm DFN package.

For new designs, we recommend the LTC3526L-2/ LTC3526LB-2.

  Startup Voltage Frequency Burst Mode Notes
LTC3526 1V 1MHz Yes Not Recommended For New Designs
LTC3526B 1V 1MHz No Not Recommended For New Designs
LTC3526-2 1V 2MHz Yes Not Recommended For New Designs
LTC3526B-2 1V 2MHz No Not Recommended For New Designs
LTC3526L 0.85V 1MHz Yes  
LTC3526LB 0.85V 1MHz No  
LTC3526L-2 0.85V 2MHz Yes  
LTC3526LB-2 0.85V 2MHz No  

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
LTC3526BEDC-2#PBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3526BEDC-2#TRMPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3526BEDC-2#TRPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3526EDC-2#PBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3526EDC-2#TRMPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC3526EDC-2#TRPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes


LTC3526-2 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
LTC3526BEDC-2#PBF 2x2 DFN-6 E $2.50 Yes
LTC3526BEDC-2#TRMPBF 2x2 DFN-6 E $2.50 $1.80 Yes
LTC3526BEDC-2#TRPBF 2x2 DFN-6 E $2.50 $1.75 Yes
LTC3526EDC-2#PBF 2x2 DFN-6 E $2.50 Yes
LTC3526EDC-2#TRMPBF 2x2 DFN-6 E $2.50 $1.80 Yes
LTC3526EDC-2#TRPBF 2x2 DFN-6 E $2.50 $1.75 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

  • Medical Instruments
  • Flash-Based MP3 Players
  • Noise Canceling Headphones
  • Wireless Mice
  • Bluetooth Headsets

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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:
LTC3526
LTC3526-2
LTC3526B
LTC3526B-2
LTC3526L
LTC3526L-2
LTC3526LB
LTC3526LB-2

Technical Support