LT3519IMS#PBF

LED Driver IC Overview

The LT3519IMS#PBF is a fixed frequency step-up DC/DC converter designed to drive LEDs, manufactured by Analog Devices Inc. It features an internal 45V, 750mA low-side switch and integrated Schottky diode. The device supports a wide input voltage range from 3V to 30V with transient protection up to 40V. Operating at a fixed frequency of 400kHz, it offers flexible LED current sensing from 0V to 45V. The IC provides constant-current and constant-voltage regulation via floating LED current sense pins. It supports Boost, SEPIC, Buck-Boost, or Buck mode topologies and includes open LED protection.

LED Driver IC Feature Summary

• Integrates a 45V, 750mA low-side switch and Schottky diode for efficient power conversion.
• Supports multiple topologies including Boost, SEPIC, Buck-Boost, and Buck modes.
• Enables high-resolution dimming through external PWM providing up to 3000:1 True Color PWM control.
• Features floating LED current sense pins allowing flexible configuration for various LED driving applications.

LED Driver IC Applications

• LED lighting systems requiring constant-current regulation
• Automotive LED driver circuits
• Portable battery-powered LED illumination devices

LED Driver IC Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the IMS package variant matches the required 16-pin MSOP footprint for PCB layout. Ensure the component meets automotive qualification requirements if intended for vehicle applications. Cross-reference the datasheet revision to confirm pinout compatibility with existing designs.

LED Driver IC Selection Notes

Select this component when a fixed 400kHz switching frequency is required for EMI management. Choose the LT3519 for applications needing a 750mA internal switch current limit. Consider this part for designs utilizing SEPIC or Buck-Boost topologies due to its wide input voltage range. Verify that the 30V maximum input voltage aligns with the system supply constraints.

LED Driver IC Part Context

The LT3519 belongs to Linear Technology's family of LED driver ICs. It is distinct from higher-frequency variants like the LT3519EMS-2 which operates at 2.2MHz. The IMS#PBF designation specifies the standard tube packaging for the MSOP-16 package. This part is functionally similar to other LT3519 variants but differs in switching frequency and package type.

LED Driver IC Replacement Considerations

LT3519IMS (non-PBF version) for non-RoHS requirements. LT3519IMSTRPBF for tape-and-reel packaging instead of tubes. LT3519EMS-2#PBF if a higher 2.2MHz switching frequency is acceptable for smaller passive components.