LT8391 60 V Synchronous 4-Switch Buck-Boost LED Controller

Analog Devices’ step-up/step-down controllers for LED driver and battery charger applications in automotive, industrial, and battery-powered systems

Image of Linear Technology's LT8391 LED ControllerPower by Linear/Analog Devices’ LT8391 is a 60 V synchronous 4-switch buck-boost LED controller. This device allows for adjustable and synchronizable 150 kHz to 650 kHz fixed frequency operation for the LT8391 and 600 kHz to 2 MHz fixed frequency operation for the LT8391A. With 4 V to 60 V input, 0 V to 60 V output, and seamless low noise transitions between operation regions.

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 100 mV full scale. Fault protection is provided to detect an open or short LED condition, during which the controller retries, latches off, or keeps running. The LT8391 is ideal for LED driver and battery charger applications in automotive, industrial, and battery-powered systems.

Image of Linear Technology's LT8391 LED Controller's Schematic
  Image of Linear Technology's LT8391 LED Controller's Efficiency vs VIN
Features
  • 4-switch output
  • Single inductor architecture allows VIN above, below, or equal to VOUT
  • Wide VIN range: 4 V to 60 V
  • Wide VOUT range: 0 V to 60 V (51 V LED)
  • Synchronous switching: up to 98% efficiency
  • Proprietary peak-buck, peak-boost current mode
  • ±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: 150 kHz to 650 kHz (LT8391)
  • Adjustable and synchronizable: 600 kHz to 2 MHz (LT8391A)
  • 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 (4 mm x 5 mm)
Applications
 
  • High powered LED lighting
  • Automotive lead lamps
 
  • Running lights

LT8391 LED Controller Eval Boards

ImageManufacturer Part NumberDescriptionCurrent - Output / ChannelVoltage - OutputAvailable QuantityView Details
DC2345A datasheet linkDEMO BOARD FOR LT8391EFEDC2345ADEMO BOARD FOR LT8391EFE2A25V2 - Immediate
137 - Factory Stock
DC2345A product page link
DC2575A datasheet linkLT8391AIFE DEMO BOARD 60V, 2MHZDC2575ALT8391AIFE DEMO BOARD 60V, 2MHZ1.5A16V1 - Immediate
190 - Factory Stock
DC2575A product page link

LT8391 LED Controller ICs

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
LT8391AEFE#PBF datasheet link60V SYNCHRONOUS 4-SWITCH BUCK-BOLT8391AEFE#PBF60V SYNCHRONOUS 4-SWITCH BUCK-BO146 - Immediate
400 - Factory Stock
LT8391AEFE#PBF product page link
LT8391AEUFD#PBF datasheet link60V 2MHZ SYNCHRONOUS 4-SWITCH BULT8391AEUFD#PBF60V 2MHZ SYNCHRONOUS 4-SWITCH BU156 - Immediate
511 - Factory Stock
LT8391AEUFD#PBF product page link
LT8391AHFE#PBF datasheet link60V SYNCHRONOUS 4-SWITCH BUCK-BOLT8391AHFE#PBF60V SYNCHRONOUS 4-SWITCH BUCK-BO50 - Immediate
2850 - Factory Stock
LT8391AHFE#PBF product page link
LT8391AHUFD#PBF datasheet link60V SYNCHRONOUS 4-SWITCH BUCK-BOLT8391AHUFD#PBF60V SYNCHRONOUS 4-SWITCH BUCK-BO73 - Immediate
1752 - Factory Stock
LT8391AHUFD#PBF product page link
LT8391AIFE#PBF datasheet link60V SYNCHRONOUS 4-SWITCH BUCK-BOLT8391AIFE#PBF60V SYNCHRONOUS 4-SWITCH BUCK-BO37 - Immediate
1900 - Factory Stock
LT8391AIFE#PBF product page link
LT8391AIUFD#PBF datasheet link60V SYNCHRONOUS 4-SWITCH BUCK-BOLT8391AIUFD#PBF60V SYNCHRONOUS 4-SWITCH BUCK-BO73 - Immediate
657 - Factory Stock
LT8391AIUFD#PBF product page link
LT8391EFE#PBF datasheet linkIC LED DRIVER CTRLR 28-TSSOPLT8391EFE#PBFIC LED DRIVER CTRLR 28-TSSOP480 - Immediate
1000 - Factory Stock
LT8391EFE#PBF product page link
LT8391EUFD#PBF datasheet linkIC LED DRIVER CTRLR 28-QFNLT8391EUFD#PBFIC LED DRIVER CTRLR 28-QFN557 - Immediate
438 - Factory Stock
LT8391EUFD#PBF product page link
LT8391HFE#PBF datasheet link60V SYNCHRONOUS 4-SWITCH BUCK-BOLT8391HFE#PBF60V SYNCHRONOUS 4-SWITCH BUCK-BO50 - Immediate
LT8391HFE#PBF product page link
LT8391HUFD#PBF datasheet link60V SYNCHRONOUS 4-SWITCH BUCK-BOLT8391HUFD#PBF60V SYNCHRONOUS 4-SWITCH BUCK-BO73 - Immediate
1387 - Factory Stock
LT8391HUFD#PBF product page link
LT8391IFE#PBF datasheet linkIC LED DRIVER CTRLR 28-TSSOPLT8391IFE#PBFIC LED DRIVER CTRLR 28-TSSOP150 - Immediate
2500 - Factory Stock
LT8391IFE#PBF product page link
LT8391IUFD#PBF datasheet linkIC LED DRIVER CTRLR 28-QFNLT8391IUFD#PBFIC LED DRIVER CTRLR 28-QFN300 - Immediate
4088 - Factory Stock
LT8391IUFD#PBF product page link
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Published: 2018-07-10