LT8393
Info : RECOMMENDED FOR NEW DESIGNS
searchIcon
cartIcon

LT8393

60VIN, 100VOUT Synchronous 4-Switch Buck-Boost LED Driver Controller with Low EMI

Show More showmore-icon

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 20
1ku List Price Starting From $4.17
Features
  • 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • Up to 95% Efficiency
  • Proprietary Peak-Buck Peak-Boost Current Mode
  • Wide VIN Range: 4V to 60V
  • Wide VOUT Range: 0V to 100V
  • ±4% LED Current Accuracy
  • 2000:1 External and 128:1 Internal PWM Dimming
  • 10V High Side PMOS PWM Switch Driver
  • No Top MOSFET Refresh Noise in Buck or Boost
  • Adjustable and Synchronizable: 350kHz to 2MHz
  • Flicker-Free Spread Spectrum for Low EMI
  • Open and Short LED Protection with Fault Reporting
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
show more Icon

The LT8393 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 350kHz to 2MHz fixed frequency operation, or internal 25% triangle spread spectrum operation for low EMI. With 4V to 60V input, 0V to 100V output, and seamless low noise transitions between operation regions, the LT8393 is ideal for LED driver and battery charger applications in automotive, industrial, and battery-powered systems.

The LT8393 provides both internal (up to 128:1) and external (up to 2000:1) LED current PWM dimming with 10V of high side PMOS gate drive. The CTRL pin provides 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 LT8393 retries, latches off, or keeps running.

APPLICATIONS

  • Automotive Head Lamps/Running Lamps
  • High Voltage LED Lighting
Part Models 20
1ku List Price Starting From $4.17

close icon
Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT8393EFE#PBF
  • HTML
  • HTML
LT8393EFE#TRPBF
  • HTML
  • HTML
LT8393EUFDM#PBF
  • HTML
  • HTML
LT8393EUFDM#TRPBF
  • HTML
  • HTML
LT8393HFE#PBF
  • HTML
  • HTML
LT8393HFE#TRPBF
  • HTML
  • HTML
LT8393HFE#WPBF
  • HTML
  • HTML
LT8393HFE#WTRPBF
  • HTML
  • HTML
LT8393HUFDM#PBF
  • HTML
  • HTML
LT8393HUFDM#TRPBF
  • HTML
  • HTML
LT8393HUFDM#WPBF
  • HTML
  • HTML
LT8393HUFDM#WTRPBF
  • HTML
  • HTML
LT8393JFE#PBF
  • HTML
  • HTML
LT8393JFE#TRPBF
  • HTML
  • HTML
LT8393JFE#WPBF
  • HTML
  • HTML
LT8393JFE#WTRPBF
  • HTML
  • HTML
LT8393JUFDM#PBF
  • HTML
  • HTML
LT8393JUFDM#TRPBF
  • HTML
  • HTML
LT8393JUFDM#WPBF
  • HTML
  • HTML
LT8393JUFDM#WTRPBF
  • HTML
  • HTML

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

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

LT8393EFE#PBF

PRODUCTION

LT8393EFE#TRPBF

PRODUCTION

LT8393HFE#PBF

PRODUCTION

LT8393HFE#TRPBF

PRODUCTION

LT8393HFE#WPBF

PRODUCTION

LT8393HFE#WTRPBF

PRODUCTION

LT8393JFE#PBF

PRODUCTION

LT8393JFE#TRPBF

PRODUCTION

LT8393JFE#WPBF

PRODUCTION

LT8393JFE#WTRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

arrow down

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

LT8393EFE#PBF

PRODUCTION

LT8393EFE#TRPBF

PRODUCTION

LT8393HFE#PBF

PRODUCTION

LT8393HFE#TRPBF

PRODUCTION

LT8393HFE#WPBF

PRODUCTION

LT8393HFE#WTRPBF

PRODUCTION

LT8393JFE#PBF

PRODUCTION

LT8393JFE#TRPBF

PRODUCTION

LT8393JFE#WPBF

PRODUCTION

LT8393JFE#WTRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC2865A

LT8393 | 60VIN, 100VOUT Synchronous 4-Switch Buck-Boost LED Driver with Low EMI

zoom

DC2865A

LT8393 | 60VIN, 100VOUT Synchronous 4-Switch Buck-Boost LED Driver with Low EMI

LT8393 | 60VIN, 100VOUT Synchronous 4-Switch Buck-Boost LED Driver with Low EMI

Product Detail

Demonstration circuit 2865A is a synchronous 4-switch buck-boost LED driver featuring the LT8393. This demonstration circuit drives a single string of LEDs up to 70V at 300mA. DC2865A runs from an input voltage of 9V to 18V as-built and is capable of 4VIN to 60VIN if UVLO is adjusted. It runs at 350kHz switching frequency and features spread spectrum modulation (SSFM) which spreads the switching frequency from fSW to fSW + 25%. Both analog and PWM dimming are featured. DC2865A features undervoltage lockout (UVLO) set at 7.9V with 1.4V hysteresis for turn-on.

The LT8393 has an adjustable switching frequency between 350kHz and 2MHz. The SYNC jumper also allows external frequency synchronization.

The LT8393 can be PWM dimmed for accurate brightness control with an external PWM signal and an internally- generated PWM signal. DC2865A has a jumper that can be set to switch between internally-generated PWM signal, externally-generated PWM signal, and no PWM signal (100% on). It can be analog dimmed with a control voltage on its CTRL pin.

When run with both PWM dimming and spread spectrum, the spread spectrum aligns itself with the PWM signal for flicker-free operation.

The LT8393 features both open LED and short LED (LED+ to GND) protection as well as a fault output flag.

Small ceramic input and output capacitors save space and cost. The open LED overvoltage protection uses the IC’s constant voltage regulation loop to regulate the output to approximately 70V if the LED string is opened.

The input and output EMI filters on the demo circuit reduce the EMI of this power converter. This is intended for automotive applications where CISPR25 Class 5 standards are observed. Additionally, gate resistors and grounded shield can be added on the demo circuit for further EMI reduction if necessary. In non-automotive applications, where EMI may not be as important, the input and output filter can be removed for higher efficiency.

The UVLO voltage, LED current, output voltage range, switching frequency, brightness control, and SSFM can all be adjusted with simple modifications to the demonstration circuit.

The LT8393 data sheet gives a complete description of the device, operation and applications information. The data sheet must be read in conjunction with the demo manual for DC2865A. The LT8393JFE is assembled in a 28-lead plastic TSSOP package with a thermally enhanced GND.

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.

Recently Viewed