LTC3525 - 400mA Micropower Synchronous Step-Up DC/DC Converter with Output Disconnect
Features
- Up to 95% Efficiency
- Output Disconnect and Inrush Current Limit
- Fixed Output Voltages of 3V, 3.3V or 5V
- Delivers 65mA at 3V from a 1V Input
- Delivers 60mA at 3.3V from a 1V Input, or 140mA at 3.3V from a 1.8V Input
- Delivers 175mA at 5V from a 3V Input
- Burst Mode® Operation: IQ = 7μA
- Only Three External Components
- VIN > VOUT Operation
- <1μA Shutdown Current
- Antiringing Control
- Short-Circuit and Overtemperature Protection
- Very Low Profile of 1mm
- Tiny 6-Lead SC70 Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3525-3/LTC3525-3.3/LTC3525-5 are high efficiency synchronous step-up DC/DC converters with output disconnect that can start up with an input as low as 0.85V. They offer a compact, high efficiency alternative to charge pumps in single cell or dual cell alkaline or Li-Ion applications. Only three small external components are required. The LTC3525 is offered in fixed output voltages of 3V, 3.3V or 5V.
The device includes a 0.5Ω N-channel MOSFET switch and a 0.8Ω P-channel synchronous rectifier. Peak switch current ranges from 150mA to 400mA, depending on load, providing enhanced efficiency. Quiescent current is an ultralow 7μA, maximizing battery life in portable applications.
Other features include <1μA shutdown current, antiringing control and thermal shutdown. The LTC3525 is available in a tiny 6-Lead SC70 package.
| List of LTC3525 Options | |||
| PART NAME | INPUT START-UP VOLTAGE | OUTPUT VOLTAGE | VOUT STATUS IN SHUTDOWN MODE |
| LTC3525-3 | 0.85V | 3V | Output Disconnect |
| LTC3525-3.3 | 0.85V | 3.3V | Output Disconnect |
| LTC3525-5 | 0.85V | 5V | Output Disconnect |
| LTC3525D-3.3 | 0.85V | 3.3V | Pass Through Mode |
| LTC3525L-3 | 0.7V | 3V | Output Disconnect |
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 |
|---|---|---|---|---|---|
| LTC3525ESC6-3.3#TRMPBF | SC-70 | SC6 | E | 05-08-1638 | Yes |
| LTC3525ESC6-3.3#TRPBF | SC-70 | SC6 | E | 05-08-1638 | Yes |
| LTC3525ESC6-3#TRMPBF | SC-70 | SC6 | E | 05-08-1638 | Yes |
| LTC3525ESC6-3#TRPBF | SC-70 | SC6 | E | 05-08-1638 | Yes |
| LTC3525ESC6-5#PBF | SC-70 | SC6 | E | 05-08-1638 | Yes |
| LTC3525ESC6-5#TRMPBF | SC-70 | SC6 | E | 05-08-1638 | Yes |
| LTC3525ESC6-5#TRPBF | SC-70 | SC6 | E | 05-08-1638 | Yes |
| LTC3525ISC6-3.3#PBF | SC-70 | SC6 | I | 05-08-1638 | Yes |
| LTC3525ISC6-3.3#TRMPBF | SC-70 | SC6 | I | 05-08-1638 | Yes |
| LTC3525ISC6-3.3#TRPBF | SC-70 | SC6 | I | 05-08-1638 | Yes |
| LTC3525ISC6-3#PBF | SC-70 | SC6 | I | 05-08-1638 | Yes |
| LTC3525ISC6-3#TRMPBF | SC-70 | SC6 | I | 05-08-1638 | Yes |
| LTC3525ISC6-3#TRPBF | SC-70 | SC6 | I | 05-08-1638 | Yes |
| LTC3525ISC6-5#PBF | SC-70 | SC6 | I | 05-08-1638 | Yes |
| LTC3525ISC6-5#TRMPBF | SC-70 | SC6 | I | 05-08-1638 | Yes |
| LTC3525ISC6-5#TRPBF | SC-70 | SC6 | I | 05-08-1638 | Yes |
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 | |
|---|---|---|---|---|---|---|
| LTC3525ESC6-3.3#TRMPBF | SC-70 | E | $2.57 | $1.83 | Yes | |
| LTC3525ESC6-3.3#TRPBF | SC-70 | E | $2.57 | $1.81 | Yes | |
| LTC3525ESC6-3#TRMPBF | SC-70 | E | $2.57 | $1.83 | Yes | |
| LTC3525ESC6-3#TRPBF | SC-70 | E | $2.57 | $1.81 | Yes | |
| LTC3525ESC6-5#PBF | SC-70 | E | $2.57 | Yes | ||
| LTC3525ESC6-5#TRMPBF | SC-70 | E | $2.57 | $1.83 | Yes | |
| LTC3525ESC6-5#TRPBF | SC-70 | E | $2.57 | $1.81 | Yes | |
| LTC3525ISC6-3.3#PBF | SC-70 | I | $2.86 | Yes | ||
| LTC3525ISC6-3.3#TRMPBF | SC-70 | I | $2.86 | $2.00 | Yes | |
| LTC3525ISC6-3.3#TRPBF | SC-70 | I | $2.86 | $2.00 | Yes | |
| LTC3525ISC6-3#PBF | SC-70 | I | $2.86 | Yes | ||
| LTC3525ISC6-3#TRMPBF | SC-70 | I | $2.86 | $2.00 | Yes | |
| LTC3525ISC6-3#TRPBF | SC-70 | I | $2.86 | $2.00 | Yes | |
| LTC3525ISC6-5#PBF | SC-70 | I | $2.86 | Yes | ||
| LTC3525ISC6-5#TRMPBF | SC-70 | I | $2.86 | $2.00 | Yes | |
| LTC3525ISC6-5#TRPBF | SC-70 | I | $2.86 | $2.00 | Yes | |
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|
| DC879A-A | LTC3525-3.3 Demo Board | Micropower Synchronous Step-Up, 1V to 3.2VIN, 3.3VOUT @ 140mA | $75.00 | |
| DC879A-B | LTC3525-5 Demo Board | Micropower Synchronous Step-Up, 1V to 4.5VIN, 5VOUT @ 175mA | $75.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3525ISC6-3.3#PBF | SC-70 | I | $2.86 | Yes | ||
| LTC3525ISC6-3.3#TRMPBF | SC-70 | I | $2.86 | $2.00 | Yes | |
| LTC3525ISC6-3.3#TRPBF | SC-70 | I | $2.86 | $2.00 | Yes | |
| LTC3525ISC6-3#PBF | SC-70 | I | $2.86 | Yes | ||
| LTC3525ISC6-3#TRMPBF | SC-70 | I | $2.86 | $2.00 | Yes | |
| LTC3525ISC6-3#TRPBF | SC-70 | I | $2.86 | $2.00 | Yes | |
| LTC3525ISC6-5#PBF | SC-70 | I | $2.86 | Yes | ||
| LTC3525ISC6-5#TRMPBF | SC-70 | I | $2.86 | $2.00 | Yes | |
| LTC3525ISC6-5#TRPBF | SC-70 | I | $2.86 | $2.00 | Yes | |
| Buy Now • Request Samples | ||||||
Applications
- MP3 Players
- Portable Instruments
- Glucose Meters
- Digital Cameras
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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
- LTC3525-3 Demo Circuit - Compact, High Efficiency Boost for Single Cell Alkaline (1-1.6V to 3V @ 65mA)
- LTC3525-3.3 Demo Circuit - Single Alkaline or NiMH to 3.3V Converter (1-1.6V to 3.3V @ 60mA)
- LTC3525-3.3 Demo Circuit - Compact, High Efficiency Boost for Two Cell Alkaline or NiMH (1.8-3.2V to 3.3V @ 140mA)
- LTC3525-5 Demo Circuit - Compact, High Efficiency Boost for Single Cell Li-Ion (3-4.2V to 5V @ 175mA)
- 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:
LTC3525-3
LTC3525-3.3
LTC3525-5
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
