LT8391A
Info : RECOMMENDED FOR NEW DESIGNS
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LT8391A

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 16
1ku List Price Starting From $3.80
Features
  • 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • Up to 95% Efficiency at 2MHz
  • 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
  • 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
Additional Details
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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

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

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Apr 11, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

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PCN

Apr 6, 2022

- 22_0068

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT8391AEFE#PBF

PRODUCTION

LT8391AEFE#TRPBF

PRODUCTION

LT8391AHFE#PBF

PRODUCTION

LT8391AHFE#TRPBF

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LT8391AJFE#WTRPBF

PRODUCTION

Apr 11, 2019

- 19_0067

arrow down

Notification of Wafer Fab Location Change for 0.35 BCD Process

LT8391AEFE#PBF

PRODUCTION

LT8391AEFE#TRPBF

PRODUCTION

LT8391AEUFD#PBF

PRODUCTION

LT8391AEUFD#TRPBF

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2575A

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

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DC2575A

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

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

Product Detail

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 fSW to fSW + 25% for reduced EMI. SSFM is not necessary in applications where EMI is not important.

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.

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