LT3433 - High Voltage Step-Up/Step-Down DC/DC Converter
Features
- Automatic Step-Up and Step-Down Conversion
- Uses a Single Inductor
- Wide 4V to 60V Input Voltage Range
- VOUT from 3.3V to 20V
- Dual Internal 500mA Switches
- 100µA No-Load Quiescent Current
- Low Current Shutdown
- ±1% Output Voltage Accuracy
- 200kHz Operating Frequency
- Boosted Supply Pin to Saturate High Side Switch
- Frequency Foldback Protection
- Current Limit Foldback Protection
- Current Limit Unaffected by Duty Cycle
- 16-lead Thermally Enhanced TSSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT3433 is a 200kHz fixed-frequency current mode switching regulator that provides both step-up and stepdown regulation using a single inductor. The IC operates over a 4V to 60V input voltage range making it suitable for use in various wide input voltage range applications such as automotive electronics that must withstand both load dump and cold crank conditions.
Internal control circuitry monitors system conditions and converts from single switch buck operation to dual switch bridged operation when required, seamlessly changing between step-down and step-up voltage conversion.
Optional Burst Mode operation reduces no-load quiescent current to 100µA and maintains high efficiencies with light loads.
Current limit foldback and frequency foldback help prevent inductor current runaway during start-up. Programmable soft-start helps prevent output overshoot at start-up.
The LT3433 is available in a 16-lead thermally enhanced 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 |
|---|---|---|---|---|---|
| LT3433EFE#PBF | TSSOP-16 | FE | E | 05-08-1663 (BB) | Yes |
| LT3433EFE#TRPBF | TSSOP-16 | FE | E | 05-08-1663 (BB) | Yes |
| LT3433IFE#PBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT3433IFE#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 | |
|---|---|---|---|---|---|---|
| LT3433EFE#PBF | TSSOP-16 | E | $4.64 | $3.25 | Yes | |
| LT3433EFE#TRPBF | TSSOP-16 | E | $3.37 | Yes | ||
| LT3433IFE#PBF | TSSOP-16 | I | $5.36 | $3.75 | Yes | |
| LT3433IFE#TRPBF | TSSOP-16 | I | $3.87 | 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 |
|---|---|---|---|
| DC527A | LT3433EFE | Step-Up/Step-Down Converter, 4V to 60V Input, Vout=5V/400mA @ 12Vin, See Load Current Table | $125.00 | |
| 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 | |
|---|---|---|---|---|---|---|
| LT3433IFE#PBF | TSSOP-16 | I | $5.36 | $3.75 | Yes | |
| LT3433IFE#TRPBF | TSSOP-16 | I | $3.87 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- 12V Automotive Systems
- Wall Adapter Powered Systems
- Battery Power Voltage Buffering
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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:
LT3433
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.
