LT3663 - 1.2A Step-Down Switching Regulator with Output Current Limit

Features

  • Wide Input Range:
    Operation from 7.5V to 36V
    Overvoltage Lockout Protects Circuit through 60V Transients
  • Programmable Output Current Limit (0.4A to 1.2A)
  • 3.3V and 5V Fixed Output Voltage Options
  • Integrated Boost Diode
  • Fixed Frequency, Peak Current Mode Control
    LT3663 fSW = 1.5MHz
    LT3663-X fSW = 1MHZ
  • Low Switch VCESAT: 275mV at 1A
  • Internally Compensated
  • Thermal Protection
  • Thermally Enhanced 8-Pin 2mm × 3mm DFN and
  • MSOP Packages
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LT3663 Typical Application
LT3663 Typical Application

Description

The LT3663 is a current mode step-down switching regulator with programmable output current limit. The current limit accurately controls the system power dissipation and reduces the size of the power path components.

The wide operating input voltage range of 7.5V to 36V (60V transient) suits the LT3663 to a variety of input sources, including unregulated 12V wall adapters, 24V industrial supplies, and automotive power.

The LT3663 includes a low current shutdown mode, input overvoltage and undervoltage lockout, and thermal shutdown. Internal compensation and boost diode minimize the number of external exponents. 3.3V and 5V fixed output voltage versions are available.

The LT3663 is available in 8-lead DFN and MSOP packages with exposed pads for low thermal resistance.

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
LT3663EDCB-3.3#PBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LT3663EDCB-3.3#TRMPBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LT3663EDCB-3.3#TRPBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LT3663EDCB#PBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LT3663EDCB#TRMPBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LT3663EDCB#TRPBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LT3663EMS8E-3.3#PBF MS-8E MS8E E 05-08-1662 Yes
LT3663EMS8E-3.3#TRPBF MS-8E MS8E E 05-08-1662 Yes
LT3663EMS8E-5#PBF MS-8E MS8E E 05-08-1662 Yes
LT3663EMS8E-5#TRPBF MS-8E MS8E E 05-08-1662 Yes
LT3663EMS8E#PBF MS-8E MS8E E 05-08-1662 Yes
LT3663EMS8E#TRPBF MS-8E MS8E E 05-08-1662 Yes
LT3663HMS8E-3.3#PBF MS-8E MS8E H 05-08-1662 Yes
LT3663HMS8E-3.3#TRPBF MS-8E MS8E H 05-08-1662 Yes
LT3663HMS8E-5#PBF MS-8E MS8E H 05-08-1662 Yes
LT3663HMS8E-5#TRPBF MS-8E MS8E H 05-08-1662 Yes
LT3663HMS8E#PBF MS-8E MS8E H 05-08-1662 Yes
LT3663HMS8E#TRPBF MS-8E MS8E H 05-08-1662 Yes
LT3663IDCB#PBF 2x3 DFN-8 DCB I 05-08-1718 Yes
LT3663IDCB#TRMPBF 2x3 DFN-8 DCB I 05-08-1718 Yes
LT3663IDCB#TRPBF 2x3 DFN-8 DCB I 05-08-1718 Yes
LT3663IMS8E-3.3#PBF MS-8E MS8E I 05-08-1662 Yes
LT3663IMS8E-3.3#TRPBF MS-8E MS8E I 05-08-1662 Yes
LT3663IMS8E-5#PBF MS-8E MS8E I 05-08-1662 Yes
LT3663IMS8E-5#TRPBF MS-8E MS8E I 05-08-1662 Yes
LT3663IMS8E#PBF MS-8E MS8E I 05-08-1662 Yes
LT3663IMS8E#TRPBF MS-8E MS8E I 05-08-1662 Yes


LT3663 Package Drawing
LT3663 Package Drawing
LT3663 Package Drawing
LT3663 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
LT3663EDCB-3.3#PBF 2x3 DFN-8 E $3.57 Yes
LT3663EDCB-3.3#TRMPBF 2x3 DFN-8 E $3.57 $2.55 Yes
LT3663EDCB-3.3#TRPBF 2x3 DFN-8 E $3.57 $2.50 Yes
LT3663EDCB#PBF 2x3 DFN-8 E $3.57 Yes
LT3663EDCB#TRMPBF 2x3 DFN-8 E $3.57 $2.55 Yes
LT3663EDCB#TRPBF 2x3 DFN-8 E $3.57 $2.50 Yes
LT3663EMS8E-3.3#PBF MS-8E E $3.71 $2.60 Yes
LT3663EMS8E-3.3#TRPBF MS-8E E $2.66 Yes
LT3663EMS8E-5#PBF MS-8E E $3.71 $2.60 Yes
LT3663EMS8E-5#TRPBF MS-8E E $2.66 Yes
LT3663EMS8E#PBF MS-8E E $3.71 $2.60 Yes
LT3663EMS8E#TRPBF MS-8E E $2.66 Yes
LT3663HMS8E-3.3#PBF MS-8E H $4.73 $3.31 Yes
LT3663HMS8E-3.3#TRPBF MS-8E H $3.37 Yes
LT3663HMS8E-5#PBF MS-8E H $4.73 $3.31 Yes
LT3663HMS8E-5#TRPBF MS-8E H $3.37 Yes
LT3663HMS8E#PBF MS-8E H $4.73 $3.31 Yes
LT3663HMS8E#TRPBF MS-8E H $3.37 Yes
LT3663IDCB#PBF 2x3 DFN-8 I $4.20 Yes
LT3663IDCB#TRMPBF 2x3 DFN-8 I $4.20 $2.99 Yes
LT3663IDCB#TRPBF 2x3 DFN-8 I $4.20 $2.94 Yes
LT3663IMS8E-3.3#PBF MS-8E I $4.37 $3.06 Yes
LT3663IMS8E-3.3#TRPBF MS-8E I $3.12 Yes
LT3663IMS8E-5#PBF MS-8E I $4.37 $3.06 Yes
LT3663IMS8E-5#TRPBF MS-8E I $3.12 Yes
LT3663IMS8E#PBF MS-8E I $4.37 $3.06 Yes
LT3663IMS8E#TRPBF MS-8E I $3.12 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
DC1419A LT3663EDCB DEMO BOARD | Adj Current Limit, 7.5V ≤ VIN ≤ 36/60V, Vout = 3.3V or 5V @ 0.6A to 1.2A $75.00
DC1570A-A LT3663EDCB-3.3 Demo Board | Adj Current Limit, 7.5V ≤ VIN ≤ 36/60V, Vout = 3.3V @ 0.6A to 1.2A $75.00
DC1570A-B LT3663EDCB-5 Demo Board | Adj Current Limit, 7.5V ≤ VIN ≤ 36/60V, Vout = 5V @ 0.6A to 1.2A $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
LT3663HMS8E-3.3#PBF MS-8E H $4.73 $3.31 Yes
LT3663HMS8E-3.3#TRPBF MS-8E H $3.37 Yes
LT3663HMS8E-5#PBF MS-8E H $4.73 $3.31 Yes
LT3663HMS8E-5#TRPBF MS-8E H $3.37 Yes
LT3663HMS8E#PBF MS-8E H $4.73 $3.31 Yes
LT3663HMS8E#TRPBF MS-8E H $3.37 Yes
LT3663IMS8E-3.3#PBF MS-8E I $4.37 $3.06 Yes
LT3663IMS8E-3.3#TRPBF MS-8E I $3.12 Yes
LT3663IMS8E-5#PBF MS-8E I $4.37 $3.06 Yes
LT3663IMS8E-5#TRPBF MS-8E I $3.12 Yes
LT3663IMS8E#PBF MS-8E I $4.37 $3.06 Yes
LT3663IMS8E#TRPBF MS-8E I $3.12 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

  • Distributed Supply Regulation
  • Automotive Battery Regulation
  • Industrial Supplies
  • Wall Transformer 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:
LT3663
LT3663-3.3
LT3663-5

Technical Support