LTC3789 - High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
- Single Inductor Architecture Allows VIN Above, Below or Equal to the Regulated VOUT
- Programmable Input or Output Current
- Wide VIN Range: 4V to 38V
- 1% Output Voltage Accuracy: 0.8V < VOUT < 38V
- Synchronous Rectification: Up to 98% Efficiency
- Current Mode Control
- Phase-Lockable Fixed Frequency: 200kHz to 600kHz
- No Reverse Current During Start-Up
- Power Good Output Voltage Monitor
- Internal 5.5V LDO
- Quad N-Channel MOSFET Synchronous Drive
- VOUT Disconnected from VIN During Shutdown
- True Soft-Start and VOUT Short Protection, Even in Boost Mode
- Available in 28-Lead QFN (4mm × 5mm) and 28-Lead SSOP Packages
The LTC®3789 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The constant-frequency, current mode architecture allows a phase-lockable frequency of up to 600kHz, while an output current feedback loop provides support for battery charging. With a wide 4V to 38V (40V maximum) input and output range and seamless, low noise transitions between operating regions, the LTC3789 is ideal for automotive, telecom and battery-powered systems.
The operating mode of the controller is determined through the MODE/PLLIN pin. The MODE/PLLIN pin can select between pulse-skipping mode and forced continuous mode operation and allows the IC to be synchronized to an external clock. Pulse-skipping mode offers high efficiency and low ripple at light loads, while forced continuous mode operates at a constant frequency for noise-sensitive applications.
A PGOOD pin indicates when the output is within 10% of its designed set point. The LTC3789 is available in low profile 28-pin 4mm × 5mm QFN and narrow SSOP packages.
PackagingFor complete and up to date package information and drawings, please refer to our packaging page
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- 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||Pins||Temp||Price (1-99)||Price (1k)*||RoHS Data|
|Buy Now • Request Samples|
Demo BoardsLinear 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.
|DC1523A||LTC3789EGN Demo Board | 5V VIN 36V, VOUT = 12V @ 5A.||$200.00|
|DC1721A||LTC4000EGN/LTC3789EGN Demo Board u 14.6V, 5A Battery Charger with 6VIN to 36VIN Buck-Boost Converter.||$250.00|
|DC1757A||LTC3789EGN Buck-Boost Demo Board | VIN = 6V to 36V, VOUT = 12V @ 12A.||$200.00|
|DC1878A||LTC3789EGN Demo Board I Vin Range: 8V to 75V, VOUT: 12V @ 5A.||$200.00|
|DC1881A||LTC3789EUFD Buck-Boost Demo Board | VIN = 6V to 36V, VOUT = 12V @ 2.5A.||Contact Factory|
- Automotive Systems
- Distributed DC Power Systems
- High Power Battery-Operated Devices
- Industrial Control
People Who Viewed This Product Also Viewed
- LT8705 - 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller
- LTC3780 - High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
- LTC3115-1 - 40V, 2A Synchronous Buck-Boost DC/DC Converter
- LTC4000 - High Voltage High Current Controller for Battery Charging and Power Management
- LT3791 - 60V 4-Switch Synchronous Buck-Boost LED Driver Controller
- LT3791-1 - 60V 4-Switch Synchronous Buck-Boost Controller
- LT3796/LT3796-1 - 100V Constant-Current and Constant-Voltage Controller with Dual Current Sense
- LT3652 - Power Tracking 2A Battery Charger for Solar Power
- LTM4609 - 36VIN, 34VOUT High Efficiency Buck-Boost DC/DC μModule Regulator
- LTM4607 - 36Vin, 24Vout High Efﬁciency Buck-Boost DC/DC uModule
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
The LTpowerCAD II 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:
LTspice IV 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 IV
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 IV
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice IV 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 IV: