LT3502/LT3502A - 1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm × 2mm DFN and MS10
Features
- 3V to 40V Input Voltage Range
- 500mA Output Current
- Switching Frequency: 2.2MHz (LT3502A), 1.1MHz (LT3502)
- 800mV Feedback Voltage
- Short-Circuit Robust
- Soft-Start
- Low Shutdown Current: <2μA
- Internally Compensated
- Internal Boost Diode
- Thermally Enhanced 2mm × 2mm 8-Lead DFN and 10-Lead MS10 Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT®3502/LT3502A are current mode PWM step-down DC/DC converters with an internal 500mA power switch, in tiny 8-lead 2mm × 2mm DFN and 10-lead MS10 packages. The wide input voltage range of 3V to 40V makes the LT3502/LT3502A suitable for regulating power from a wide variety of sources, including 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and capacitors, resulting in a very small solution. Constant frequency above the AM band avoids interfering with radio reception, making the LT3502A particularly suitable for automotive applications.
Cycle-by-cycle current limit and frequency foldback provide protection against shorted outputs. Soft-start and frequency foldback eliminates input current surge during start-up. DA current sense provides further protection in fault conditions. An internal boost diode reduces component count.
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 |
|---|---|---|---|---|---|
| LT3502AEDC#PBF | 2x2 DFN-8 | DC8 | E | 05-08-1719 | Yes |
| LT3502AEDC#TRMPBF | 2x2 DFN-8 | DC8 | E | 05-08-1719 | Yes |
| LT3502AEDC#TRPBF | 2x2 DFN-8 | DC8 | E | 05-08-1719 | Yes |
| LT3502AEMS#PBF | MS-10 | MS | E | 05-08-1661 | Yes |
| LT3502AEMS#TRPBF | MS-10 | MS | E | 05-08-1661 | Yes |
| LT3502AIDC#PBF | 2x2 DFN-8 | DC8 | I | 05-08-1719 | Yes |
| LT3502AIDC#TRMPBF | 2x2 DFN-8 | DC8 | I | 05-08-1719 | Yes |
| LT3502AIDC#TRPBF | 2x2 DFN-8 | DC8 | I | 05-08-1719 | Yes |
| LT3502AIMS#PBF | MS-10 | MS | I | 05-08-1661 | Yes |
| LT3502AIMS#TRPBF | MS-10 | MS | I | 05-08-1661 | Yes |
| LT3502EDC#PBF | 2x2 DFN-8 | DC8 | E | 05-08-1719 | Yes |
| LT3502EDC#TRMPBF | 2x2 DFN-8 | DC8 | E | 05-08-1719 | Yes |
| LT3502EDC#TRPBF | 2x2 DFN-8 | DC8 | E | 05-08-1719 | Yes |
| LT3502EMS#PBF | MS-10 | MS | E | 05-08-1661 | Yes |
| LT3502EMS#TRPBF | MS-10 | MS | E | 05-08-1661 | Yes |
| LT3502IDC#PBF | 2x2 DFN-8 | DC8 | I | 05-08-1719 | Yes |
| LT3502IDC#TRMPBF | 2x2 DFN-8 | DC8 | I | 05-08-1719 | Yes |
| LT3502IDC#TRPBF | 2x2 DFN-8 | DC8 | I | 05-08-1719 | Yes |
| LT3502IMS#PBF | MS-10 | MS | I | 05-08-1661 | Yes |
| LT3502IMS#TRPBF | MS-10 | MS | I | 05-08-1661 | 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 | |
|---|---|---|---|---|---|---|
| LT3502AEDC#PBF | 2x2 DFN-8 | E | $2.79 | Yes | ||
| LT3502AEDC#TRMPBF | 2x2 DFN-8 | E | $2.79 | $2.00 | Yes | |
| LT3502AEDC#TRPBF | 2x2 DFN-8 | E | $2.79 | $1.95 | Yes | |
| LT3502AEMS#PBF | MS-10 | E | $2.93 | $2.05 | Yes | |
| LT3502AEMS#TRPBF | MS-10 | E | $2.11 | Yes | ||
| LT3502AIDC#PBF | 2x2 DFN-8 | I | $3.34 | Yes | ||
| LT3502AIDC#TRMPBF | 2x2 DFN-8 | I | $3.34 | $2.39 | Yes | |
| LT3502AIDC#TRPBF | 2x2 DFN-8 | I | $3.34 | $2.34 | Yes | |
| LT3502AIMS#PBF | MS-10 | I | $3.51 | $2.46 | Yes | |
| LT3502AIMS#TRPBF | MS-10 | I | $2.52 | Yes | ||
| LT3502EDC#PBF | 2x2 DFN-8 | E | $2.79 | Yes | ||
| LT3502EDC#TRMPBF | 2x2 DFN-8 | E | $2.79 | $2.00 | Yes | |
| LT3502EDC#TRPBF | 2x2 DFN-8 | E | $2.79 | $1.95 | Yes | |
| LT3502EMS#PBF | MS-10 | E | $2.93 | $2.05 | Yes | |
| LT3502EMS#TRPBF | MS-10 | E | $2.11 | Yes | ||
| LT3502IDC#PBF | 2x2 DFN-8 | I | $3.34 | Yes | ||
| LT3502IDC#TRMPBF | 2x2 DFN-8 | I | $3.34 | $2.39 | Yes | |
| LT3502IDC#TRPBF | 2x2 DFN-8 | I | $3.34 | $2.34 | Yes | |
| LT3502IMS#PBF | MS-10 | I | $3.51 | $2.46 | Yes | |
| LT3502IMS#TRPBF | MS-10 | I | $2.52 | 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 |
|---|---|---|---|
| DC1089B | LT3502AEDC Demo Board | 7V to 40V input to 5V at 500mA | $75.00 | |
| DC1221A | LT3502EDC Demo Board | 1.1MHz, 500mA Step-Down Reg in DFN | $75.00 | |
| DC1221B | LT3502EDC Demo Board | 1.1MHz,500mA Step-Down Regulator | $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 | |
|---|---|---|---|---|---|---|
| LT3502AIDC#PBF | 2x2 DFN-8 | I | $3.34 | Yes | ||
| LT3502AIDC#TRMPBF | 2x2 DFN-8 | I | $3.34 | $2.39 | Yes | |
| LT3502AIDC#TRPBF | 2x2 DFN-8 | I | $3.34 | $2.34 | Yes | |
| LT3502AIMS#PBF | MS-10 | I | $3.51 | $2.46 | Yes | |
| LT3502AIMS#TRPBF | MS-10 | I | $2.52 | Yes | ||
| LT3502IDC#PBF | 2x2 DFN-8 | I | $3.34 | Yes | ||
| LT3502IDC#TRMPBF | 2x2 DFN-8 | I | $3.34 | $2.39 | Yes | |
| LT3502IDC#TRPBF | 2x2 DFN-8 | I | $3.34 | $2.34 | Yes | |
| LT3502IMS#PBF | MS-10 | I | $3.51 | $2.46 | Yes | |
| LT3502IMS#TRPBF | MS-10 | I | $2.52 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Automotive Systems
- Battery-Powered Equipment
- Wall Transformer Regulation
- Distributed Supply Regulation
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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:
LT3502
LT3502A
LTpowerCAD
The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
LT3502
LT3502A
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.
