LT3791IFE-1#PBF

Overview

The LT3791IFE-1#PBF is a synchronous four-switch buck-boost controller designed for high-power LED driving and voltage regulation. It supports an input voltage range of 4.7V to 60V and regulates output voltages up to 60V, or drives LED strings up to 52V. The device operates with a switching frequency between 200 kHz and 700 kHz and features a 38-pin TSSOP-EP package. It provides ±2% output voltage accuracy and ±6% LED current accuracy, ensuring stable performance across wide operating temperature ranges from -40°C to +125°C.

Feature Summary

• Synchronous four-switch single-inductor architecture enables seamless transition between buck, boost, and buck-boost modes without top MOSFET refresh cycles
• Integrated True Color PWM dimming and analog dimming capabilities for precise light control
• Rail-to-rail current sensing with monitor outputs for accurate input and LED current monitoring
• Automatic disconnection of output from input during shutdown mode

Applications

• High-power LED string drivers in automotive headlamps and running lights
• Industrial lighting systems requiring wide input voltage tolerance
• Battery charging applications with variable source voltages
• General-purpose power supplies needing step-up/step-down regulation

Procurement Notes

Verify the specific suffix '#PBF' indicates lead-free RoHS compliance and tube packaging when sourcing. Confirm the 'IFE-1' designation aligns with the required pinout and functional specifications for your design. Ensure compatibility with the 38-TSSOP-EP thermal pad requirements for proper heat dissipation. Cross-reference the manufacturer's latest datasheet revision to confirm any updates to electrical characteristics or recommended operating conditions prior to final procurement.

Selection Notes

Select this component when designing systems that require operation with input voltages both above and below the target output level. It is suitable for applications demanding high efficiency through synchronous rectification and precise current regulation for LED strings. Consider the 38-pin package size and thermal management needs associated with the exposed pad. Evaluate the need for integrated dimming controls and fault protection features inherent to this controller family.

Part Context

This part belongs to the LT3791 series of synchronous buck-boost controllers manufactured by Analog Devices Inc. (formerly Linear Technology). The '-1' suffix typically denotes specific internal configuration or accuracy variants within the family. It is designed as a successor to earlier linear technology regulators, offering improved integration for complex power conversion tasks in demanding environments.

Replacement Considerations

Public confirmed substitute part numbers include LT3791EFE-1#PBF and LT3791IFE-1#TRPBF. Verify pin compatibility and thermal performance when substituting between tube and tape-and-reel packaging options.