Features and Benefits
- 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
The LT3790 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.
- Automotive, Telecom, Industrial Systems
- High Power Battery-Powered System
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The DC2123B is a 60V four-switch synchronous buck-boost controller that demonstrates the high power capability of the LT3790. The output is 24V and the maximum output current is 5A. The switching frequency is 200kHz and efficiency is as high as 98% for a 24V input.
The LT3790 is capable of high power operation. DC2123B can be altered for increased output power with higher minimum input voltage. If VIN remains always above 20V, IOUT can be increased to 12A+ (for 290W output) by changing RS2 to 4mΩ.
Documentation & Resources
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, 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.
Models for the following parts are available in LTspice:
LT3790 Companion Parts
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LT3790EFE#PBF||Material Declaration||Reliability Data||38-Lead TSSOP w/ EP|
|LT3790EFE#TRPBF||Material Declaration||Reliability Data||38-Lead TSSOP w/ EP|
|LT3790HFE#PBF||Material Declaration||Reliability Data||38-Lead TSSOP w/ EP|
|LT3790HFE#TRPBF||Material Declaration||Reliability Data||38-Lead TSSOP w/ EP|
|LT3790IFE#PBF||Material Declaration||Reliability Data||38-Lead TSSOP w/ EP|
|LT3790IFE#TRPBF||Material Declaration||Reliability Data||38-Lead TSSOP w/ EP|
|LT3790MPFE#PBF||Material Declaration||Reliability Data||38-Lead TSSOP w/ EP|
|LT3790MPFE#TRPBF||Material Declaration||Reliability Data||38-Lead TSSOP w/ EP|
|Wafer Fabrication Data||R526 Reliability Data|
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Sample & Buy
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Buy Now Pricing
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.