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
AEC-Q100 data available for specific packages
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 |
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 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 |
|---|---|---|---|
| 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 | |
| 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 | |
|---|---|---|---|---|---|---|
| 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 Now • Request Samples | ||||||
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:
- Step 1: If you have not installed LTpowerCAD on this computer, download and install LTpowerCAD
- Step 2: Once LTpowerCAD is installed, click on the link(s) below to open the project file
- Step 3: If LTpowerCAD does not automatically open after clicking the link above, you can open the project file by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTpowerCAD and open the project file by selecting 'Open Project' from the 'File' menu
Design tools for the following parts are available in LTpowerCAD:
LTC3603
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.
