LT3790 - 60V Synchronous 4-Switch Buck-Boost Controller
Features
- 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
- Synchronous Switching: Up to 98.5% Efficiency
- Wide VIN Range: 4.7V to 60V
- 2% Output Voltage Accuracy: 1.2V ≤ VOUT < 60V
- 6% Output Current Accuracy: 0V ≤ VOUT < 60V
- Input and Output Current Regulation with Current Monitor Outputs
- No Top FET Refresh in Buck or Boost
- VOUT Disconnected from VIN During Shutdown
- C/10 Charge Termination and Output Shorted Flags
- Capable of 100W or greater per IC
- Easy Parallel Capability to Extend Output Power
- 38-Lead TSSOP with Exposed Pad
Typical Application
Description
The LT®3790 is a synchronous 4-switch buck-boost voltage/ current regulator controller. The LT3790 can regulate output voltage, output current, or input current with input voltages above, below, or equal to the output voltage. The constant-frequency, current mode architecture allows its frequency to be adjusted or synchronized from 200kHz to 700kHz. No top FET refresh switching cycle is needed in buck or boost operation. With 60V input, 60V output capability and seamless transitions between operating regions, the LT3790 is ideal for voltage regulator, battery/ super-capacitor charger applications in automotive, industrial, telecom, and even battery-powered systems.
The LT3790 provides input current monitor, output current monitor, and various status flags, such as C/10 charge termination and shorted output flag.
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 |
|---|---|---|---|---|---|
| LT3790EFE#PBF | TSSOP-38 | FE | E | 05-08-1772 | Yes |
| LT3790EFE#TRPBF | TSSOP-38 | FE | E | 05-08-1772 | Yes |
| LT3790HFE#PBF | TSSOP-38 | FE | H | 05-08-1772 | Yes |
| LT3790HFE#TRPBF | TSSOP-38 | FE | H | 05-08-1772 | Yes |
| LT3790IFE#PBF | TSSOP-38 | FE | I | 05-08-1772 | Yes |
| LT3790IFE#TRPBF | TSSOP-38 | FE | I | 05-08-1772 | Yes |
| LT3790MPFE#PBF | TSSOP-38 | FE | MP | 05-08-1772 | Yes |
| LT3790MPFE#TRPBF | TSSOP-38 | FE | MP | 05-08-1772 | 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 | |
|---|---|---|---|---|---|---|
| LT3790EFE#PBF | TSSOP-38 | E | $6.79 | $4.75 | Yes | |
| LT3790EFE#TRPBF | TSSOP-38 | E | $4.81 | Yes | ||
| LT3790HFE#PBF | TSSOP-38 | H | $7.86 | $5.50 | Yes | |
| LT3790HFE#TRPBF | TSSOP-38 | H | $5.56 | Yes | ||
| LT3790IFE#PBF | TSSOP-38 | I | $7.50 | $5.25 | Yes | |
| LT3790IFE#TRPBF | TSSOP-38 | I | $5.31 | Yes | ||
| LT3790MPFE#PBF | TSSOP-38 | MP | $21.07 | $14.75 | Yes | |
| LT3790MPFE#TRPBF | TSSOP-38 | MP | $14.81 | 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 |
|---|---|---|---|
| DC2123A | LT3790 Demo Board | Sync Buck-Boost, 12V ≤ VIN ≤ 57V, Vout = 24V @ Up to 5A | Contact Factory | |
| DC2123B | LT3790 Demo Board | Sync Buck-Boost, 8V ≤ VIN ≤ 56V, Vout = 24V at up to 5A | $200.00 | |
| Buy Now | |||
Applications
- Automotive, Telecom, Industrial Systems
- High Power Battery-Powered System
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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:
LT3790
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:
LT3790
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.
