LTC3624/LTC3624-2 - 17V, 2A Synchronous Step-Down Regulator with 3.5μA Quiescent Current
Features
- Wide VIN Range: 2.7V to 17V
- Wide VOUT Range: 0.6V to VIN
- 95% Max Efficiency
- Low IQ: 3.5μA, Zero-Current Shutdown
- Constant Frequency (1MHz/2.25MHz)
- Fixed VOUT Options Available
- Low Dropout Operation (100% Duty Cycle) with Ultralow IQ
- 2A Rated Output Current
- ±1% Output Voltage Accuracy
- Current Mode Operation for Excellent Line and Load Transient Response
- Synchronizable to External Clock
- Pulse-Skipping, Forced Continuous, Burst Mode® Operation
- Internal Compensation and Soft-Start
- Overtemperature Protection
- Compact 8-Lead DFN (3mm × 3mm) Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3624/LTC3624-2 is a high efficiency 17V, 2A synchronous monolithic step-down regulator. The switching frequency is fixed to 1MHz (LTC3624) or 2.25MHz (LTC3624-2) with a ±40% synchronization range. The regulator features ultralow quiescent current and high efficiency over a wide VOUT range.
The step-down regulator operates from an input voltage range of 2.7V to 17V and provides an adjustable output range from 0.6V to VIN while delivering up to 2A of output current. A user-selectable mode input is provided to allow the user to trade off ripple noise for light load efficiency; Burst Mode operation provides the highest efficiency at light loads, while pulse-skipping mode provides the lowest voltage ripple. The MODE pin can also be used to sync the switching frequency to an external clock.
LTC3624/LTC3624-2 Options
| Part Number | Frequency | Vout |
| LTC3624 | 1MHz | Adjustable |
| LTC3624-3.3 | 1MHz | 3.3V |
| LTC3624-5 | 1MHz | 5V |
| LTC3624-2 | 2.25MHz | Adjustable |
| LTC3624-23.3 | 2.25MHz | 3.3 |
| LTC3624-25 | 2.25MHz | 5V |
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 |
|---|---|---|---|---|---|
| LTC3624EDD-2#PBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3624EDD-2#TRPBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3624EDD-23.3#PBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3624EDD-23.3#TRPBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3624EDD-25#PBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3624EDD-25#TRPBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3624EDD-3.3#PBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3624EDD-3.3#TRPBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3624EDD-5#PBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3624EDD-5#TRPBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3624EDD#PBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3624EDD#TRPBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3624EMSE-2#PBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LTC3624EMSE-2#TRPBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LTC3624EMSE-23.3#PBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LTC3624EMSE-23.3#TRPBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LTC3624EMSE-25#PBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LTC3624EMSE-25#TRPBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LTC3624EMSE-3.3#PBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LTC3624EMSE-3.3#TRPBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LTC3624EMSE-5#PBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LTC3624EMSE-5#TRPBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LTC3624EMSE#PBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LTC3624EMSE#TRPBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LTC3624HMSE-2#PBF | MS-12E | MSE | H | 05-08-1666 | Yes |
| LTC3624HMSE-2#TRPBF | MS-12E | MSE | H | 05-08-1666 | Yes |
| LTC3624HMSE-23.3#PBF | MS-12E | MSE | H | 05-08-1666 | Yes |
| LTC3624HMSE-23.3#TRPBF | MS-12E | MSE | H | 05-08-1666 | Yes |
| LTC3624HMSE-25#PBF | MS-12E | MSE | H | 05-08-1666 | Yes |
| LTC3624HMSE-25#TRPBF | MS-12E | MSE | H | 05-08-1666 | Yes |
| LTC3624HMSE-3.3#PBF | MS-12E | MSE | H | 05-08-1666 | Yes |
| LTC3624HMSE-3.3#TRPBF | MS-12E | MSE | H | 05-08-1666 | Yes |
| LTC3624HMSE-5#PBF | MS-12E | MSE | H | 05-08-1666 | Yes |
| LTC3624HMSE-5#TRPBF | MS-12E | MSE | H | 05-08-1666 | Yes |
| LTC3624HMSE#PBF | MS-12E | MSE | H | 05-08-1666 | Yes |
| LTC3624HMSE#TRPBF | MS-12E | MSE | H | 05-08-1666 | Yes |
| LTC3624IDD-2#PBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3624IDD-2#TRPBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3624IDD-23.3#PBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3624IDD-23.3#TRPBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3624IDD-25#PBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3624IDD-25#TRPBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3624IDD-3.3#PBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3624IDD-3.3#TRPBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3624IDD-5#PBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3624IDD-5#TRPBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3624IDD#PBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3624IDD#TRPBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3624IMSE-2#PBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LTC3624IMSE-2#TRPBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LTC3624IMSE-23.3#PBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LTC3624IMSE-23.3#TRPBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LTC3624IMSE-25#PBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LTC3624IMSE-25#TRPBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LTC3624IMSE-3.3#PBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LTC3624IMSE-3.3#TRPBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LTC3624IMSE-5#PBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LTC3624IMSE-5#TRPBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LTC3624IMSE#PBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LTC3624IMSE#TRPBF | MS-12E | MSE | I | 05-08-1666 | 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
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 |
|---|---|---|---|
| DC2005A | LTC3624 Demo Board (DFN) | Micropower Sync Buck, 2.7V ≤ VIN ≤ 17V, Vout = 1.2V/1.8V/2.5V/3.3V/5V/Adj @ 2A | $150.00 | |
| DC2359A | LTC3624 Demo Board (MSOP) | Micropower Sync Buck, 2.7V ≤ VIN ≤ 17V, Vout = 1.2V/1.8V/2.5V/3.3V/5V @ 2A | Contact Factory | |
| 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 pagesales office or authorized distributor.
Applications
- Battery Powered Equipment
- Portable Instrumentation
- Emergency Radios
- General Purpose Step-Down Supplies
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Product Notifications
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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
- LTC3624 Demo Circuit - High Efficiency Buck Regulator with Ultralow Quiescent Current (5.6-17V to 5V @ 2A)
- LTC3624-2 Demo Circuit - High Efficiency Buck Regulator with Ultralow Quiescent Current (5.6-17V to 5V @ 2A)
- LTC3624 Demo Circuit - High Efficiency Buck Regulator with Ultralow Quiescent Current (5.6-17V to 5V @ 2A)
- 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:
LTC3624
LTC3624-2
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:
LTC3624
LTC3624-2
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.
