LT8391
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LT8391

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

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LTspice LT8391 Demo Circuit - High Efficiency 50W Buck-Boost LED Driver (4-60V to 25V LED @ 2A) Download 6.27 KB LTspice LT8391 - LED Driver IC Download 5.35 KB
Part Models 18
1ku List Price Starting From $3.80
Features
  • 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • Synchronous Switching: Up to 98% Efficiency
  • Proprietary Peak-Buck Peak-Boost Current Mode
  • Wide VIN Range: 4V to 60V
  • Wide VOUT 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
Additional Details
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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
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file View Data Sheet (Rev.B)
Documentation View All Documentation
LTspice LT8391 Demo Circuit - High Efficiency 50W Buck-Boost LED Driver (4-60V to 25V LED @ 2A) Download 6.27 KB LTspice LT8391 - LED Driver IC Download 5.35 KB
Part Models 18
1ku List Price Starting From $3.80
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LT8391

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UPDATED 03/02/2016
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LT8391: 60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum Data Sheet (Rev.B)

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UPDATED 09/01/2016
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LT8391: スペクトラム拡散機能付き、60V、4スイッチ同期整流式 昇降圧LEDコントローラ データシート

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UPDATED 03/23/2018
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UPDATED 02/26/2016
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Design Note 548: 60V Buck-Boost LED Driver with Up to 98% Efficiency Has Internal PWM Dimming and Spread Spectrum redirect icon

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UPDATED 02/26/2016
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设计要点 548: 效率高达 98% 的 60V 降压-升压型 LED 驱动器具有内部 PWM 调光和扩展频谱 redirect icon

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DN-548: 内部 PWM 調光およびスペクトラム拡散機能を持つ最大効率 98% の 60V 昇降圧 LEDドライバ redirect icon

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Documentation

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.

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LT8391IFE#PBF 28-Lead TSSOP w/ EP external-link
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LT8391JFE#PBF 28-Lead TSSOP w/ EP external-link
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LT8391JFE#TRPBF 28-Lead TSSOP w/ EP external-link
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Notification of Wafer Fab Location Change for 0.35 BCD Process

LT8391EFE#PBF

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Software & Part Ecosystem

Software & Part Ecosystem

Parts Product Life Cycle Description

Surge Stopper, Overvoltage, and Overcurrent Protection1
LT4363
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High Voltage Surge Stopper with Current Limit

Evaluation Kit

Evaluation Kits 1

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DC2345A

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

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DC2345A

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

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DC2345A
LT8391EFE Demo Board | Sync Buck-Boost LED Driver, 4V ≤ VIN ≤ 60V, VLED = 25V @ 2A
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Product Detail

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

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DC2345A - Demo Manual Download

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DC2345A - Design Files Download

1.98 M

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DC2345A - Schematic Download

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Evaluation Kits1

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DC2345A

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

Tools & Simulations 1

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.

spice tool Lt Spice

LT8391 Demo Circuit - High Efficiency 50W Buck-Boost LED Driver (4-60V to 25V LED @ 2A) Download

6.27 K

spice tool Lt Spice

LT8391 - LED Driver IC Download

5.35 K

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