LT3430 - High Voltage, 3A, 200kHz Step-Down Switching Regulator
Features
- Wide Input Range: 5.5V to 60V
- 3A Peak Switch Current over All Duty Cycles
- Constant Switching Frequency:
200kHz (LT3430)
100kHz (LT3430-1) - 0.1Ω Switch Resistance
- Current Mode
- Effective Supply Current: 2.5mA
- Shutdown Current: 30µA
- 1.2V Feedback Reference Voltage
- Easily Synchronizable
- Cycle-by-Cycle Current Limiting
- Small, 16-Pin Thermally Enhanced TSSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT3430/LT3430-1 are monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 3A, 0.1Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and excellent loop stability.
Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry* maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 30µA and a SYNC pin can be externally synchronized with a logic level input from 228kHz to 700kHz for the LT3430 or from 125kHz to 250kHz for the LT3430-1.
The LT3430/LT3430-1 are available in a thermally enhanced 16-pin TSSOP package.
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 |
|---|---|---|---|---|---|
| LT3430EFE-1#PBF | TSSOP-16 | FE | E | 05-08-1663 (BB) | Yes |
| LT3430EFE-1#TRPBF | TSSOP-16 | FE | E | 05-08-1663 (BB) | Yes |
| LT3430EFE#PBF | TSSOP-16 | FE | E | 05-08-1663 (BB) | Yes |
| LT3430EFE#TRPBF | TSSOP-16 | FE | E | 05-08-1663 (BB) | Yes |
| LT3430IFE-1#PBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT3430IFE-1#TRPBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT3430IFE#PBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT3430IFE#TRPBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | 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 | |
|---|---|---|---|---|---|---|
| LT3430EFE-1#PBF | TSSOP-16 | E | $7.07 | $4.95 | Yes | |
| LT3430EFE-1#TRPBF | TSSOP-16 | E | $5.07 | Yes | ||
| LT3430EFE#PBF | TSSOP-16 | E | $7.07 | $4.95 | Yes | |
| LT3430EFE#TRPBF | TSSOP-16 | E | $5.07 | Yes | ||
| LT3430IFE-1#PBF | TSSOP-16 | I | $8.13 | $5.69 | Yes | |
| LT3430IFE-1#TRPBF | TSSOP-16 | I | $5.81 | Yes | ||
| LT3430IFE#PBF | TSSOP-16 | I | $8.13 | $5.69 | Yes | |
| LT3430IFE#TRPBF | TSSOP-16 | I | $5.81 | 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 |
|---|---|---|---|
| DC1200A | LT3430EFE-1 Demo Board | 5.5V ≤ VIN ≤ 60V, VOUT = 3.3V @ 2A | Contact Factory | |
| DC471A | LT3430EFE | High Voltage Buck Converter, Vin = 7.5V to 60V, Vout = 5V @ 2A | $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 | |
|---|---|---|---|---|---|---|
| LT3430IFE-1#PBF | TSSOP-16 | I | $8.13 | $5.69 | Yes | |
| LT3430IFE-1#TRPBF | TSSOP-16 | I | $5.81 | Yes | ||
| LT3430IFE#PBF | TSSOP-16 | I | $8.13 | $5.69 | Yes | |
| LT3430IFE#TRPBF | TSSOP-16 | I | $5.81 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Industrial and Automotive Power Supplies
- Portable Computers
- Battery Chargers
- Distributed Power Systems
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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:
LT3430
LT3430-1
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:
LT3430
LT3430-1
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.
