LT3796IFE

Updated: 2026-09-11

Overview

The LT3796IFE is a monolithic synchronous buck-boost switching regulator IC manufactured by Analog Devices. It is designed to provide efficient power conversion across a wide range of input voltages, making it suitable for applications where the input supply may vary above or below the desired output voltage. The device operates over an input voltage range of 4V to 40V and can deliver output voltages from 1.25V to 40V. Its synchronous rectification architecture enables high efficiency (up to 98%) across various operating conditions, reducing power losses and thermal dissipation.

Structure and Working Principle

The LT3796IFE integrates four power MOSFETs in a single package, configured in an H-bridge topology that enables both buck and boost operation. The internal control logic automatically transitions between buck, boost, and buck-boost modes as needed to maintain regulation. The IC uses a constant-frequency current mode control scheme with a programmable switching frequency (100kHz to 1MHz). This allows designers to optimize efficiency and minimize external component size. The device includes comprehensive protection features such as overcurrent protection, thermal shutdown, and input/output overvoltage protection.

Key Features

Key features of the LT3796IFE include its wide 4V to 40V input voltage range, making it suitable for automotive and industrial applications where input voltages may vary significantly. The synchronous rectification eliminates the need for external Schottky diodes, improving efficiency and reducing component count. The device offers adjustable switching frequency (100kHz to 1MHz) for optimization of efficiency or external component size. Additional features include programmable soft-start, power good indicator, and synchronization capability. The thermally enhanced TSSOP package ensures reliable operation in demanding environments.

Application Areas

The LT3796IFE is commonly used in industrial power systems, automotive electronics, and telecommunications equipment where stable power conversion from variable input sources is required. Typical applications include battery-powered systems, LED drivers, and distributed power systems. In automotive applications, it is used for powering infotainment systems, ADAS modules, and other electronics from the vehicle's battery system. Industrial applications include factory automation equipment, test and measurement instruments, and renewable energy systems where input voltages may fluctuate widely.

Maintenance and Precautions

Proper PCB layout is critical when using the LT3796IFE to minimize switching noise and ensure thermal performance. The power components should be placed close to the IC with short, wide traces. Adequate copper area should be provided for heat dissipation. The device requires appropriate input and output capacitors to ensure stable operation. When operating at high switching frequencies or high currents, attention must be paid to component selection to minimize losses. Thermal vias should be used under the IC package to transfer heat to the PCB's ground plane.

B2B Procurement Guide

When procuring LT3796IFE in volume, buyers should verify the manufacturer's lead time and minimum order quantities. Analog Devices typically offers this part through authorized distributors with volume pricing tiers. Consider ordering evaluation boards for design verification. For long-term projects, discuss lifecycle status with suppliers as power ICs may undergo revisions. Check for alternative packaging options if thermal requirements differ from standard TSSOP. Some distributors offer value-added services like programming or testing for large orders.