550mA 2MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN
Features and Benefits
- 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
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|
- Medical Instruments
- Flash-Based MP3 Players
- Noise Canceling Headphones
- Wireless Mice
- Bluetooth Headsets
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, 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.
Models for the following parts are available in LTspice:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.