LT8391

RECOMMENDED FOR NEW DESIGNS

60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum

Data Sheet (Rev. B) Product Selection Table

Part Models: 18
1ku List Price: Starting From $3.80

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Part Details

4-Switch Single Inductor Architecture Allows V_IN Above, Below or Equal to V_OUT
Synchronous Switching: Up to 98% Efficiency
Proprietary Peak-Buck Peak-Boost Current Mode
Wide V_IN Range: 4V to 60V
Wide V_OUT Range: 0V to 60V (51V LED)
±3% LED Current Accuracy
2000:1 External and 128:1 Internal PWM Dimming
High Side PMOS PWM Switch Driver

Integrated Bootstrap Diodes
No Top MOSFET Refresh Noise in Buck or Boost
Adjustable and Synchronizable: 150kHz to 650kHz
Flicker-Free Spread Spectrum for Low EMI
Open and Short LED Protection with Fault Reporting
Available in 28-Lead TSSOP with Exposed Pad and 28-Lead QFN (4mm × 5mm)
AEC-Q100 Qualified for Automotive Applications

The LT8391 is a synchronous 4-switch buck-boost LED controller that regulates LED current from input voltage above, below, or equal to the output voltage. The proprietary peak-buck peak-boost current mode control scheme allows adjustable and synchronizable 150kHz to 650kHz fixed frequency operation, or internal ±15% triangle spread spectrum operation for low EMI. With 4V to 60V input, 0V to 60V output, and seamless low noise transitions between operation regions, the LT8391 is ideal for LED driver and battery charger applications in automotive, industrial, and battery-powered systems.

The LT8391 provides both internal (up to 128:1) and external (up to 2000:1) LED current PWM dimming with a high-side PMOS switch. Two CTRL pins provide flexible 20:1 analog dimming with ±3% LED current accuracy at 100mV full scale. Fault protection is provided to detect an open or short LED condition, during which the LT8391 retries, latches off, or keeps running.


	Switching Frequency	Max Output Power
LT8391	Adjustable 150kHz - 650kHz	450W+
LT8391A	2MHz	50W+

APPLICATIONS

Automotive Head Lamps/Running Lamps
High Power LED Lighting

Part Models: 18
1ku List Price: Starting From $3.80

Documentation

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT8391EFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391EFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391EUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391HFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391HFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391HFE#WPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391HFE#WTRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391HUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391HUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391IFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391IFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391JFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391JFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391JFE#WPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391JFE#WTRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LT8391EFE#PBF	PRODUCTION
LT8391EFE#TRPBF	PRODUCTION
LT8391HFE#PBF	PRODUCTION
LT8391HFE#TRPBF	PRODUCTION
LT8391HFE#WPBF
LT8391HFE#WTRPBF
LT8391IFE#PBF	PRODUCTION
LT8391IFE#TRPBF	PRODUCTION
LT8391JFE#PBF	PRODUCTION
LT8391JFE#TRPBF	PRODUCTION
LT8391JFE#WPBF
LT8391JFE#WTRPBF
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process
		PCN19_0067_Form Material_Report Delta Qualification Matrix Qualification Results Summary Detailed Parts List Other
LT8391EFE#PBF	PRODUCTION
LT8391EFE#TRPBF	PRODUCTION
LT8391EUFD#PBF	PRODUCTION
LT8391EUFD#TRPBF	PRODUCTION
LT8391HFE#PBF	PRODUCTION
LT8391HFE#TRPBF	PRODUCTION
LT8391HUFD#PBF	PRODUCTION
LT8391HUFD#TRPBF	PRODUCTION
LT8391IFE#PBF	PRODUCTION
LT8391IFE#TRPBF	PRODUCTION
LT8391IUFD#PBF	PRODUCTION
LT8391IUFD#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT8391
LT8391A
LT8391D

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.

Evaluation Kits

LT8391EFE Demo Board | Sync Buck-Boost LED Driver, 4V ≤ VIN ≤ 60V, VLED = 25V @ 2A

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Product Details

Demonstration circuit 2345A is a 60V synchronous 4-switch buck-boost LED controller with spread spectrum featuring the LT8391 LED driver. It accepts an input voltage from 4V to 60V and drives a single string of LEDs up to 25V at 2A. DC2345A runs at 400kHz switching frequency without spread spectrum, but spread spectrum frequency modulation (SSFM) can be enabled with a simple jumper. SSFM spreads the switching frequency to fsw ±15% for reduced EMI.

Resources

DC2345A - Demo Manual
748.00K

DC2345A - Design Files
1.98 M

DC2345A - Schematic
40.00K

Latest Discussions

1 Years Ago

LT8391

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Technical Articles 1

Solutions Bulletin & Brochure 1

Rarely Asked Question Page 1

Analog Dialogue 1