LT8391A

RECOMMENDED FOR NEW DESIGNS

60V 2MHz Synchronous 4-Switch Buck-Boost LED Driver Controller

Data Sheet (Rev. A) Product Selection Table

Part Models: 16
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
Up to 95% Efficiency at 2MHz
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
No Top MOSFET Refresh Noise in Buck or Boost
Adjustable and Synchronizable: 600kHz to 2MHz
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 LT8391A 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 600kHz to 2MHz fixed frequency operation, or internal 25% 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 LT8391A is ideal for LED driver and battery charger applications in automotive, industrial, and battery-powered systems.

The LT8391A 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 LT8391A 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 Frequency LED Lighting

Part Models: 16
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
LT8391AEFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AEFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AEUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AEUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AHFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AHFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AHFE#WPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AHFE#WTRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AHUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AHUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AIFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AIFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AIUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AIUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AJFE#WPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8391AJFE#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
LT8391AEFE#PBF	PRODUCTION
LT8391AEFE#TRPBF	PRODUCTION
LT8391AHFE#PBF	PRODUCTION
LT8391AHFE#TRPBF	PRODUCTION
LT8391AHFE#WPBF	PRODUCTION
LT8391AHFE#WTRPBF	PRODUCTION
LT8391AIFE#PBF	PRODUCTION
LT8391AIFE#TRPBF	PRODUCTION
LT8391AJFE#WPBF	PRODUCTION
LT8391AJFE#WTRPBF	PRODUCTION
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
LT8391AEFE#PBF	PRODUCTION
LT8391AEFE#TRPBF	PRODUCTION
LT8391AEUFD#PBF	PRODUCTION
LT8391AEUFD#TRPBF	PRODUCTION
LT8391AHFE#PBF	PRODUCTION
LT8391AHFE#TRPBF	PRODUCTION
LT8391AHUFD#PBF	PRODUCTION
LT8391AHUFD#TRPBF	PRODUCTION
LT8391AIFE#PBF	PRODUCTION
LT8391AIFE#TRPBF	PRODUCTION
LT8391AIUFD#PBF	PRODUCTION
LT8391AIUFD#TRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice 1

LT8391A - LED Driver IC

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

LT8391AIFE Demo Board | 60V 2MHz Synchronous 1.5A Buck-Boost LED Driver

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Product Details

Demonstration circuit DC2575A is a 60V 2MHz synchronous buck-boost LED driver featuring the LT8391A. It accepts an input voltage from 4V to 60V and drives a single string of LEDs up to 16V at 1.5A. DC2575A runs at 2MHz switching frequency and features spread spectrum frequency modulation (SSFM) which can be enabled with a simple jumper. SSFM spreads the switching frequency from f_SW to f_SW + 25% for reduced EMI. SSFM is not necessary in applications where EMI is not important.

Resources

DC2575A - Schematics
9/6/2017

DC2575A - Demo Manual (Rev.A)
9/6/2017

DC2575A - Design Files
9/6/2017

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LT8391A

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Technical Articles 1

Analog Dialogue 1

Rarely Asked Question Page 1