LT3790IFE

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The LT3790IFE is a highly integrated single-channel synchronous buck controller that provides high efficiency and accurate current sensing with optimised external components. It operates with an input voltage of 4.5V to 100V and is capable of supplying up to 8A of output current. Its output voltage is adjustable from 0.8V to VIN, or it can be set to 1.25V to 4.3V utilizing an internal regulator. The LT3790IFE enables easy switching frequency control with an external resistor, as well as synchronization and margin control with an external circuit. Complete protection features and enable/disable capabilities provide a flexible and secure power solution.

Application Field

The LT3790IFE is designed for a variety of low-power, high-efficiency applications such as a point-of-load (POL) regulator, a distributed power system, a power supply for switch mode power supplies (SMPS) and AC to DC converters, a battery charger, and a general-purpose switching regulator. The device supports a wide input voltage range of 4.5V to 100V, enabling it to be used in a variety of applications.

Working Principle

The LT3790IFE is a synchronous buck controller that regulates the output voltage of a DC-DC converter by supplying a series of pulses to the gate of a low-side MOSFET. The control circuitry operates in multiple different modes. In continuous conduction mode, the LT3790IFE provides peak current mode control, enabling fast transient response and excellent load regulation. In discontinuous conduction mode, the frequency can be set to reduce ripple current. The device also has a built-in frequency foldback mode which reduces the switching frequency during light loads to further enhance efficiency.

The LT3790IFE supports a wide range of input voltages and is capable of achieving up to 95% efficiency. It has multiple built-in protection features such as over-voltage protection, over-current protection and thermal shutdown. The device also includes an on-board synchronous rectifier driver, enabling higher efficiency and smaller rectifier size. The LT3790IFE is a complete solution for high-efficiency power supply design and can be used in a variety of applications.

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