LT3570IFE#PBF

Overview

The LT3570IFE#PBF is a monolithic high voltage LED driver featuring an integrated N-channel power switch. It operates from input voltages up to 60V and supports constant current regulation for driving multiple series-connected LEDs. The device incorporates a 1.2MHz fixed-frequency current mode control architecture, enabling the use of small external components. Key electrical parameters include a maximum switching frequency of 1.2MHz, an internal switch rated for 1.5A continuous current, and a shutdown supply current of typically 4µA. It offers programmable dimming via an analog or PWM input pin.

Feature Summary

• Integrated high-voltage N-channel power switch eliminates the need for external MOSFETs
• Fixed 1.2MHz switching frequency allows for compact passive component selection
• Supports both analog and PWM dimming methods for flexible brightness control
• Includes thermal shutdown and cycle-by-cycle current limiting protection

Applications

• Automotive exterior lighting systems including headlamps and taillamps
• Industrial area lighting fixtures requiring high voltage inputs
• Portable battery-powered lighting equipment with step-up topologies
• Signage and display backlighting driven by high-side configurations

Procurement Notes

Verify the suffix PBF indicates lead-free RoHS-compliant packaging. Confirm the IFE package code corresponds to the 16-lead TSSOP footprint with exposed pad. Ensure the operating temperature range matches your specific environmental requirements before finalizing procurement orders.

Selection Notes

Select this component when a single-chip solution is required for high-voltage LED strings without external switching transistors. Consider the 1.5A switch limit when determining the maximum number of series LEDs based on forward voltage drops. Evaluate the 1.2MHz frequency against EMI constraints and inductor size requirements for the target application.

Part Context

This part belongs to Analog Devices' LT3570 family of high-voltage LED drivers. It shares functional similarities with other members like the LT3571 but differs in specific pinouts and internal switch ratings. The IFE variant specifically denotes the plastic surface-mount package type used in modern automated assembly processes.

Replacement Considerations

Direct replacements must match the 60V input rating and 1.5A switch capability. Verify pin compatibility for the 16-lead TSSOP package. Cross-reference datasheets for equivalent dimming control interfaces and thermal performance characteristics to ensure seamless integration into existing designs.