LT8391AHUFD#PBF

LED Driver IC Overview

The LT8391AHUFD#PBF is a synchronous 4-switch buck-boost LED controller from Analog Devices. It regulates LED current when input voltage is above, below, or equal to output voltage. Key parameters include a 60V maximum input and output voltage range, operating frequency of 600 kHz to 2 MHz, and 1.5 A output current capability. It features PWM dimming, open LED protection, and operates within -40°C to +125°C. The device is housed in a QFN-28 package.

LED Driver IC Feature Summary

• Synchronous 4-switch buck-boost topology for flexible input-output voltage relationships
• Supports analog and PWM dimming for precise light control
• Integrated open LED protection circuitry
• Regulates output current via external sense resistor

LED Driver IC Applications

• LED lighting systems
• Display backlights
• Indicator circuits

LED Driver IC Procurement Notes

Verify the specific suffix (EUFD vs HUFD) against official Analog Devices documentation to confirm temperature grade and packaging details. Ensure compatibility with required switching frequencies and thermal management solutions for the QFN-28 package. Cross-reference pinouts and electrical characteristics with the latest datasheet before integration.

LED Driver IC Selection Notes

Select this component for applications requiring wide input voltage ranges relative to LED string voltage. Consider the 2 MHz switching frequency for smaller passive components. Evaluate thermal performance due to the QFN-28 package. Confirm that the 1.5 A current rating meets load requirements and that PWM dimming interface matches system control logic.

LED Driver IC Part Context

This part belongs to the LT8391A series of LED driver controllers. It is functionally related to the LT8390, which is a general-purpose synchronous buck-boost DC/DC controller rather than a dedicated LED driver. Both share similar topologies but differ in application-specific features like dimming and protection.

LED Driver IC Replacement Considerations

LT8391AEUFD#PBF is a variant within the same family. Verify if the 'E' suffix indicates a different temperature range or qualification status compared to the 'H' suffix. Consult official substitution guides for direct pin-compatible alternatives.