LTC3603 - 2.5A, 15V Monolithic Synchronous Step-Down Regulator

Features

  • Wide Input Voltage Range: 4.5V to 15V
  • 2.5A Output Current
  • Low RDS(ON) Internal Switches: 45mΩ and 85mΩ
  • Programmable Frequency: 300kHz to 3MHz
  • Low Quiescent Current: 75μA
  • 0.6V ±1% Reference Allows Precise,
  • Low Output Voltage
  • 99% Maximum Duty Cycle
  • Adjustable Burst Mode® Clamp
  • Synchronizable to External Clock
  • Power Good Output Voltage Monitor
  • Overtemperature Protection
  • Overvoltage Protection
  • Available in 16-Lead Thermally Enhanced MSOP and 4mm × 4mm QFN Packages
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LTC3603 Typical Application
LTC3603 Typical Application

Description

The LTC3603 is a high efficiency, monolithic synchronous step-down DC/DC converter utilizing a constant-frequency, current mode architecture. It operates from an input voltage range of 4.5V to 15V and provides an adjustable regulated output voltage from 0.6V to 14.5V while delivering up to 2.5A of output current. The internal synchronous power switch with 45mΩ on-resistance increases efficiency and eliminates the need for an external Schottky diode. The switching frequency can either be set by an external resistor or synchronized to an external clock. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

The LTC3603 can be configured for either Burst Mode operation or forced continuous operation. Forced continuous operation reduces noise and RF interference, while Burst Mode operation provides the highest efficiency at light loads. In Burst Mode operation, external control of the burst clamp level allows the output voltage ripple to be adjusted according to the requirements of the application.

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
LTC3603EMSE#PBF MS-16E MSE E 05-08-1667 Yes
LTC3603EMSE#TRPBF MS-16E MSE E 05-08-1667 Yes
LTC3603EUF#PBF 4x4 QFN-20 UF E 05-08-1710 Yes
LTC3603EUF#TRPBF 4x4 QFN-20 UF E 05-08-1710 Yes
LTC3603IMSE#PBF MS-16E MSE I 05-08-1667 Yes
LTC3603IMSE#TRPBF MS-16E MSE I 05-08-1667 Yes
LTC3603IUF#PBF 4x4 QFN-20 UF I 05-08-1710 Yes
LTC3603IUF#TRPBF 4x4 QFN-20 UF I 05-08-1710 Yes


LTC3603 Package Drawing
LTC3603 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
LTC3603EMSE#PBF MS-16E E $4.64 $3.25 Yes
LTC3603EMSE#TRPBF MS-16E E $3.31 Yes
LTC3603EUF#PBF 4x4 QFN-20 E $4.64 $3.25 Yes
LTC3603EUF#TRPBF 4x4 QFN-20 E $3.31 Yes
LTC3603IMSE#PBF MS-16E I $5.46 $3.82 Yes
LTC3603IMSE#TRPBF MS-16E I $3.88 Yes
LTC3603IUF#PBF 4x4 QFN-20 I $5.46 $3.82 Yes
LTC3603IUF#TRPBF 4x4 QFN-20 I $3.88 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
DC1442A LTC3603EUF Demo Board (QFN) | 2.5A, 15V, Monolithic Synchronous Step-Down Regulator $100.00
DC1445A LTC3603EMSE Demo Board (MSOP) | 2.5A, 15V, Monolithic Synchronous Step-Down Regulator $100.00
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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
LTC3603IMSE#PBF MS-16E I $5.46 $3.82 Yes
LTC3603IMSE#TRPBF MS-16E I $3.88 Yes
LTC3603IUF#PBF 4x4 QFN-20 I $5.46 $3.82 Yes
LTC3603IUF#TRPBF 4x4 QFN-20 I $3.88 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

  • Point-of-Load Supplies
  • Portable Instruments
  • Communications Infrastructure

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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:
LTC3603

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

To open the project file for this circuit:

Design tools for the following parts are available in LTpowerCAD:
LTC3603

Technical Support