LTC7860IMSE#PBF

Overview

The LTC7860IMSE#PBF is a high-efficiency synchronous buck controller designed for board-mount surge protection applications. It integrates a 140V-rated surge stopper with a DC/DC converter, enabling direct connection to input lines subject to transient voltage spikes. The device operates from an input voltage range of 3.5V to 60V and supports output voltages down to 1.2V. Key electrical parameters include a maximum switching frequency of 1MHz, a quiescent current of 1.5mA, and a shutdown supply current of 1µA. It utilizes a 16-lead MSOP package with exposed pad.

Feature Summary

• Integrated Surge Stopper: Combines high-voltage surge suppression with synchronous buck regulation in a single component.
• High Efficiency Operation: Optimized for minimal power loss during both normal operation and surge events.
• Flexible Control Interface: Supports external timing synchronization and adjustable switching frequencies up to 1MHz.
• Compact Form Factor: Delivers robust protection and regulation within a small surface-mount package.

Applications

• Automotive electronics requiring protection against load dump and transient voltage spikes
• Industrial control systems operating in electrically noisy environments
• Aerospace and avionics power distribution units needing reliable surge mitigation
• Telecommunications infrastructure equipment susceptible to line transients

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance before procurement. Confirm availability status as distribution channels may report limited stock or discontinuation. Ensure the ordering part number matches the exact package variant required for your PCB footprint. Cross-reference the datasheet revision date to confirm technical specifications align with your design requirements.

Selection Notes

Select this component when space constraints prevent separate surge protector and regulator implementations. Evaluate thermal performance requirements due to power dissipation during surge events. Consider the input voltage range compatibility with your system's nominal and peak operating voltages. Assess the need for external components such as inductors and capacitors based on desired ripple and transient response characteristics.

Part Context

The LTC7860 belongs to Analog Devices' family of high-voltage power management solutions tailored for harsh environments. It addresses the common engineering challenge of protecting sensitive downstream circuitry from severe input transients without sacrificing conversion efficiency. This integration simplifies bill-of-materials and reduces overall solution size compared to discrete approaches.

Replacement Considerations

Direct pin-to-pin replacements are not explicitly documented in public sources. Evaluate alternative Analog Devices surge controllers like the LTC7862 for similar functionality. Verify that any substitute maintains the 140V surge rating and compatible control interface signals.

FAQ

["What is the maximum input voltage rating for the LTC7860?","The device supports an input voltage range up to 60V for normal operation, with integrated surge handling capabilities rated for higher transient voltages up to 140V."]

["Does the LTC7860 support external clock synchronization?","Yes, the controller allows for external clock synchronization to optimize noise immunity and coordinate with other system components."]

["What package type does the LTC7860IMSE use?","It is housed in a 16-lead MSOP package with an exposed thermal pad for improved heat dissipation."]