LT3514EFE

Overview

The LT3514EFE is a triple step-down switching regulator manufactured by Analog Devices Inc. It features three independent buck converters housed in a 28-lead QFN package with an exposed pad. The device supports an input voltage range from 3.2V to 36V and provides adjustable output voltages starting at a minimum of 0.8V. Each channel delivers up to 2A of output current, enabling efficient power distribution for multi-rail systems. The integrated switch frequency is programmable between 350kHz and 2.2MHz, allowing optimization for size and efficiency. Operating junction temperatures range from -40°C to +125°C.

Feature Summary

• Integrates three independent high-efficiency synchronous buck regulators within a single compact package.
• Supports 100% duty cycle operation to minimize dropout voltage during low input-to-output differential conditions.
• Features a wide input voltage range accommodating various supply sources without external level shifting.
• Includes internal compensation and soft-start circuitry to simplify design implementation and ensure stable startup.

Applications

• Industrial control systems requiring multiple isolated or non-isolated voltage rails
• Automotive electronics operating under varying battery load conditions
• Telecommunications infrastructure equipment needing efficient power conversion
• Portable instrumentation powered by single-cell lithium-ion batteries

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm pinout compatibility and thermal performance characteristics. Ensure the procurement source provides valid RoHS compliance certificates matching the PBF designation. Cross-reference the manufacturer part number with the latest datasheet revision to confirm availability of updated material declarations and packaging specifications prior to finalizing orders.

Selection Notes

Select this component when designing systems requiring three distinct regulated outputs from a single unregulated source. The wide input range makes it suitable for automotive and industrial applications where supply voltage fluctuates significantly. Consider the thermal dissipation requirements of the QFN package relative to the total load current across all three channels to determine appropriate PCB copper area for heat sinking.

Part Context

The LT3514EFE belongs to the LT3514 family of triple buck regulators designed for space-constrained applications. It replaces discrete solutions using multiple individual controllers, reducing board area and component count. The family shares common control architecture but varies in package options such as TSSOP and QFN to suit different thermal and footprint requirements.

Replacement Considerations

LT3514EUFD#PBF offers identical electrical specifications in a QFN-28 package variant.

FAQ

Does the LT3514EFE support synchronous rectification?

Yes, the device integrates synchronous rectifiers for all three channels to maximize efficiency.

What is the minimum output voltage achievable on each channel?

Each channel can be adjusted down to a minimum output voltage of 0.8V.