LT3477EUF#PBF

LED Driver IC Overview

The LT3477EUF#PBF is a current-mode DC/DC step-up converter manufactured by Analog Devices Inc. It features an internal 3A switch rated for 42V and dual rail-to-rail current sense amplifiers. The device supports multiple topologies including Boost, Flyback, Inverting, and SEPIC. Input voltage ranges from 2.5V to 25V, with a maximum output voltage of 42V. Switching frequency is adjustable between 200kHz and 3.5MHz. Output current capability is specified at 2.66A. The component operates within a temperature range of -40°C to +85°C and is housed in a 20-pin QFN package.

LED Driver IC Feature Summary

• Integrates dual rail-to-rail current sense amplifiers for precise control
• Combines traditional voltage feedback with unique current feedback loops
• Supports operation as both constant-current and constant-voltage source
• Enables accurate input current limiting capabilities

LED Driver IC Applications

• Boost conversion for white LED strings with PWM dimming
• General-purpose LED driver circuits requiring wide input voltage range
• Backplane distributed power systems
• Applications requiring precise input current limitation

LED Driver IC Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the QFN-20 package dimensions match the design footprint requirements. Ensure the operating temperature range of -40°C to +85°C meets the environmental constraints of the target application. Cross-reference the datasheet for thermal pad connection guidelines to ensure proper heat dissipation during high-current operation.

LED Driver IC Selection Notes

Select this component when a single-chip solution is required for boost or SEPIC topologies with integrated current sensing. The dual current sense amplifiers allow for flexible configuration as either constant current or constant voltage sources. Consider the 2.66A output current limit and 42V switch rating for load requirements. The adjustable switching frequency up to 3.5MHz allows for optimization of external component size versus efficiency trade-offs.

LED Driver IC Part Context

The LT3477 belongs to the LT3477 series of switching regulators. It is distinct from the LTC3577, which is a portable PMIC, and the LT3474, which is a buck LED driver. The LT3477 is specifically designed for step-up and complex topology applications involving LED driving and general DC/DC conversion with integrated current management features.

LED Driver IC Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.