LT8391EUFD#PBF

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Analog Devices Inc./Maxim Integrated

60V SYNCHRONOUS 4-SWITCH BUCK-BOOST LED CONTROLLER WITH SPREAD SPECTRUM

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LT8391EUFD#PBF

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Analog Devices Inc./Maxim Integrated

60V SYNCHRONOUS 4-SWITCH BUCK-BOOST LED CONTROLLER WITH SPREAD SPECTRUM

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Description Specifications Series Pricing CAD Documents

Description

General part information

LT8391 Series

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 FrequencyMax Output PowerLT8391Adjustable 150kHz - 650kHz450W+LT8391A2MHz50W+APPLICATIONSAutomotive Head Lamps/Running LampsHigh Frequency LED Lighting

Technical Specifications

Parameters and characteristics for this part

Specification	LT8391EUFD#PBF

Applications	Lighting
Dimming	PWM, Analog
Frequency (Max)	650 kHz
Frequency (Min)	150 kHz
Grade	Automotive
Internal Switch(s)	No
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Package / Case	28-WFQFN Exposed Pad
Package Length	4 mm
Package Name	28-QFN
Package Width	5 mm
Topology	Step-Up (Boost), Step-Down (Buck)
Type	DC DC Controller
Voltage - Output	60 V
Voltage - Supply (Max)	60 V
Voltage - Supply (Min)	4 V

LT8391 Series

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

Part	Number of Outputs	Voltage - Supply (Max)	Grade	Voltage - Output	Dimming	Package Width	Package Name	Package Length	Voltage - Supply (Min)	Type	Internal Switch(s)	Topology	Operating Temperature (Max)	Operating Temperature (Min)	Package / Case	Frequency (Min)	Frequency (Max)	Applications	Mounting Type	Package Features	Voltage - Output (Min)	Voltage - Output (Max)	Qualification
Analog Devices Inc./Maxim Integrated LT8391IUFD#TRPBF	1	60 V	Automotive	60 V	Analog PWM	5 mm	28-QFN	4 mm	4 V	DC DC Controller	No	Step-Down (Buck) Step-Up (Boost)	125 °C	-40 °C	28-WFQFN Exposed Pad	150 kHz	650 kHz	Lighting	Surface Mount
Analog Devices Inc./Maxim Integrated LT8391AEFE#TRPBF	1	60 V	Automotive	60 V	Analog PWM	4.4 mm	28-TSSOP 28-TSSOP-EP	0.173 in	4 V	DC DC Controller	No	Step-Down (Buck) Step-Up (Boost)	125 °C	-40 °C		600 kHz	2 MHz	Lighting	Surface Mount	Exposed Pad
Analog Devices Inc./Maxim Integrated LT8391DJUFDM#WTRPBF	1	60 V	Automotive		Analog PWM	5 mm	28-QFN	4 mm	4 V	DC DC Controller	No	Step-Down (Buck) Step-Up (Boost)	150 °C	-40 °C	28-WFQFN Exposed Pad	150 kHz	650 kHz	Lighting	Surface Mount Wettable Flank		0 V	60 V	AEC-Q100
Analog Devices Inc./Maxim Integrated LT8391EFE#TRPBF	1	60 V	Automotive	60 V	Analog PWM	4.4 mm	28-TSSOP 28-TSSOP-EP	0.173 in	4 V	DC DC Controller	No	Step-Down (Buck) Step-Up (Boost)	125 °C	-40 °C		150 kHz	650 kHz	Lighting	Surface Mount	Exposed Pad
Analog Devices Inc./Maxim Integrated LT8391HUFD#PBF	1	60 V	Automotive	60 V	Analog PWM	5 mm	28-QFN	4 mm	4 V	DC DC Controller	No	Step-Down (Buck) Step-Up (Boost)	150 °C	-40 °C	28-WFQFN Exposed Pad	150 kHz	650 kHz	Lighting	Surface Mount
Analog Devices Inc./Maxim Integrated LT8391IUFD#PBF	1	60 V	Automotive	60 V	Analog PWM	5 mm	28-QFN	4 mm	4 V	DC DC Controller	No	Step-Down (Buck) Step-Up (Boost)	125 °C	-40 °C	28-WFQFN Exposed Pad	150 kHz	650 kHz	Lighting	Surface Mount
Analog Devices Inc./Maxim Integrated LT8391IFE#PBF	1	60 V	Automotive	60 V	Analog PWM	4.4 mm	28-TSSOP 28-TSSOP-EP	0.173 in	4 V	DC DC Controller	No	Step-Down (Buck) Step-Up (Boost)	125 °C	-40 °C		150 kHz	650 kHz	Lighting	Surface Mount	Exposed Pad
Analog Devices Inc./Maxim Integrated LT8391HFE#TRPBF	1	60 V	Automotive	60 V	Analog PWM	4.4 mm	28-TSSOP 28-TSSOP-EP	0.173 in	4 V	DC DC Controller	No	Step-Down (Buck) Step-Up (Boost)	150 °C	-40 °C		150 kHz	650 kHz	Lighting	Surface Mount	Exposed Pad
Analog Devices Inc./Maxim Integrated LT8391AIFE#PBF	1	60 V	Automotive	60 V	Analog PWM	4.4 mm	28-TSSOP 28-TSSOP-EP	0.173 in	4 V	DC DC Controller	No	Step-Down (Buck) Step-Up (Boost)	125 °C	-40 °C		600 kHz	2 MHz	Lighting	Surface Mount	Exposed Pad
Analog Devices Inc./Maxim Integrated LT8391EFE#PBF	1	60 V	Automotive	60 V	Analog PWM	4.4 mm	28-TSSOP 28-TSSOP-EP	0.173 in	4 V	DC DC Controller	No	Step-Down (Buck) Step-Up (Boost)	125 °C	-40 °C		150 kHz	650 kHz	Lighting	Surface Mount	Exposed Pad

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LT8391EUFD#PBF | Datasheet

R570 Reliability Data