LT3791HFE-1#PBF

Overview

The LT3791HFE-1#PBF is a synchronous four-switch buck-boost controller designed for high-power LED driving and wide-input voltage regulation. It supports an input voltage range of 4.7 V to 60 V and delivers up to 10 A output current. The device operates at switching frequencies between 200 kHz and 700 kHz, with a typical quiescent current of 3 mA. It features ±2% output voltage accuracy and ±6% LED current accuracy across the 0 V to 60 V output range. The component is housed in a 38-pin TSSOP package with an exposed pad and functions within a temperature range of -40°C to +150°C.

Feature Summary

• Four-switch single-inductor architecture enables seamless transition between buck, pass-through, and boost modes regardless of input versus output voltage relationships.
• Integrated True Color PWM dimming and analog dimming capabilities ensure precise color control and smooth brightness adjustment for LED applications.
• Rail-to-rail current sensing monitors both input and LED currents with dedicated monitor outputs for accurate system feedback and protection.

Applications

• High-power LED string drivers requiring input voltages above, below, or equal to output levels
• Automotive exterior lighting systems such as headlamps and running lights
• Battery charging circuits utilizing wide input voltage ranges
• Industrial general lighting fixtures demanding high efficiency

Procurement Notes

Verify the specific suffix designation against official Analog Devices documentation to confirm functional variations, as different suffixes may indicate distinct electrical characteristics or packaging options. Ensure compatibility with the required thermal management solutions due to the power density of the 38-pin TSSOP-EP package. Cross-reference the datasheet revision history for any updates regarding material declarations or pinout configurations prior to finalizing procurement orders.

Selection Notes

Select this controller when the application demands a single-stage solution capable of handling wide dynamic input ranges without mode-hopping glitches. The integrated four-switch topology eliminates the need for external bootstrap diodes or complex gate drive circuits associated with three-switch designs. Consider the 38-pin TSSOP-EP package for its thermal dissipation capabilities in high-current scenarios exceeding standard surface-mount limitations.

Part Context

This component belongs to the LT3791 family of synchronous buck-boost controllers manufactured by Analog Devices Inc. It serves as a specialized power management IC for applications where traditional buck or boost converters cannot maintain regulation due to fluctuating input voltages. The device represents a evolution in LED driver technology, offering higher integration than previous generations while maintaining robust fault protection mechanisms.

Replacement Considerations

Public confirmed substitute part numbers include LT3791EFE#PBF and LT3791EFE-1#PBF. Verify pin compatibility and thermal performance requirements when transitioning between these variants to ensure system integrity.