LT8391AIFE#PBF

LED Driver IC Overview

The LT8391AIFE#PBF is a synchronous 4-switch buck-boost LED controller manufactured by Analog Devices Inc. It regulates LED current regardless of whether the input voltage is above, below, or equal to the output voltage. The device operates within an input voltage range of 4 V to 60 V and supports a switching frequency from 600 kHz to 2 MHz. It features a 28-TSSOP-EP package and includes PWM dimming capabilities along with open LED protection. The maximum supply current is 2.8 mA, and it functions across a temperature range of -40°C to +125°C.

LED Driver IC Feature Summary

• Synchronous 4-switch buck-boost topology for flexible input-output voltage relationships
• Integrated PWM dimming control for brightness adjustment
• Open LED protection mechanism to ensure system safety

LED Driver IC Applications

• LED lighting driver circuits
• Display backlight power supplies
• Indicator light systems

LED Driver IC Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or certified partners. Confirm that the received part matches the LT8391AIFE#PBF marking and package type. Check for physical damage to the TSSOP-EP leads. Ensure storage conditions comply with moisture sensitivity levels specified in the datasheet to maintain reliability before soldering.

LED Driver IC Selection Notes

Select this controller when input voltage fluctuates significantly relative to the required LED forward voltage. It is suitable for applications requiring high efficiency across wide input ranges. Consider the 28-TSSOP-EP package for surface-mount assembly. Evaluate thermal performance requirements based on the operating environment and expected load currents.

LED Driver IC Part Context

This component belongs to the LT8391A series of LED controllers. It shares functional similarities with other buck-boost drivers but is distinct in its specific pinout and control interface. Related variants include the LT8391AEUFD#PBF in a QFN-28 package and the LT8390AIFE#PBF, which serves as a general-purpose switching regulator rather than a dedicated LED driver.

LED Driver IC FAQ

What is the supported switching frequency range?

The LT8391AIFE#PBF supports a programmable switching frequency ranging from 600 kHz to 2 MHz.

How does the controller handle input voltages lower than the LED string voltage?

It utilizes a synchronous 4-switch buck-boost topology to regulate current even when the input voltage is below the output voltage.