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
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LT3502 Typical Application
LT3502 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


LT3502 Package Drawing
LT3502 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
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 NowRequest Samples
* 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
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
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data 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 NowRequest Samples
* 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.

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:

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