LT8391AHFE#PBF

LED Driver IC Overview

The LT8391AHFE#PBF is a synchronous 4-switch buck-boost LED controller from Analog Devices Inc. It regulates LED current when the input voltage is above, below, or equal to the output voltage. The device operates with an input voltage range of 4 V to 60 V and supports a switching frequency of 2 MHz. It features a maximum output current capability of 10 A and includes spread spectrum modulation for EMI reduction. The component is housed in a 28-lead TSSOP package with an exposed pad, designed for surface mount installation.

LED Driver IC Feature Summary

• Synchronous four-switch buck-boost topology enables regulation across wide input-to-output voltage differentials
• Integrated spread spectrum modulation reduces electromagnetic interference peaks
• High switching frequency allows for the use of small external passive components

LED Driver IC Applications

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

LED Driver IC Procurement Notes

Verify the specific suffix #PBF indicates tube packaging when reviewing procurement documents. Confirm that the AHFE variant corresponds to the 2 MHz switching frequency specification rather than the standard 600 kHz version. Ensure the 28-TSSOP exposed pad footprint matches the target PCB layout requirements before finalizing orders.

LED Driver IC Selection Notes

Select this component when designing LED drivers requiring operation with input voltages both higher and lower than the LED string voltage. The 2 MHz frequency is suitable for applications prioritizing compact board size over ultra-low standby power consumption. Consider thermal management capabilities due to the high current handling requirements inherent in the synchronous buck-boost architecture.

LED Driver IC Part Context

This part belongs to the LT8391 family of LED controllers. It shares architectural similarities with the LT8391HFE but differs in switching frequency specifications. The LT8391 series provides a robust solution for complex LED driving scenarios where traditional buck or boost converters cannot maintain regulation across varying line conditions.

LED Driver IC Replacement Considerations

LT8391HFE#PBF serves as a functional alternative within the same family, though it operates at a 600 kHz switching frequency instead of 2 MHz. Designers must verify that the change in frequency does not impact the required inductor and capacitor values in the existing circuit design.