LT8391EFE#PBF

LED Driver IC Overview

The LT8391EFE#PBF is a synchronous four-switch buck-boost LED controller from Analog Devices Inc., designed for high-efficiency LED lighting applications. It operates with an input voltage range of 4 V to 60 V and supports output voltages up to 60 V. The device regulates LED current using a fixed frequency architecture ranging from 150 kHz to 650 kHz, housed in a TSSOP-28 package. It features a maximum supply current of 2.8 mA and includes PWM dimming capabilities along with open LED protection. The component functions across a temperature range of -40°C to +125°C.

LED Driver IC Feature Summary

• Synchronous four-switch buck-boost topology enables regulation when input voltage is above, below, or equal to the output voltage.
• Integrated spread spectrum modulation reduces electromagnetic interference (EMI) noise.
• Supports PWM dimming for precise brightness control and includes open LED protection circuitry.

LED Driver IC Applications

• High-power LED street lighting systems
• Industrial area lighting fixtures
• Automotive exterior lighting modules

LED Driver IC Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and tube packaging. Confirm that the TSSOP-28 package matches your PCB footprint requirements. Ensure the operating temperature range meets your environmental specifications. Check for any regional distribution restrictions or obsolescence notices directly from Analog Devices before finalizing procurement plans.

LED Driver IC Selection Notes

Select this controller when input voltage fluctuates significantly relative to the required LED string voltage. It is suitable for designs requiring EMI reduction through spread spectrum technology. Consider the 1.5 A output current capability and the 2.8 mA supply current for power budgeting. Verify compatibility with external components for the desired switching frequency setting within the 150 kHz to 650 kHz range.

LED Driver IC Part Context

The LT8391 belongs to the LT8391 series of buck-boost LED controllers. It is distinct from the LT8390, which offers different switching frequency ranges. The device serves as a dedicated driver IC rather than a general-purpose DC/DC converter, optimizing performance for constant current LED loads.

LED Driver IC Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult Analog Devices official resources for direct pin-compatible or functionally equivalent alternatives if this specific variant is unavailable.