LT3840IFE

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DC DC Switching Controllers - LT3840IFE

The LT3840IFE is a family of high-performance synchronous step-down DC/DC controllers with an adjustable current limit. It supports a wide range of output voltages and is ideal for powering low voltage FPGAs, ASICs, and microprocessors. The LT3840IFE requires a minimum number of external components, including a high-side MOSFET, converter output capacitor and inductor. By integrating a high side switch driver, gate drivers, and complete DC/DC control loop on a single chip, it offers a cost-effective, space-saving solution for a variety of power requirements.

Application Field

The LT3840IFE contributes to the development of efficient and reliable power supplies, helping to improve performance, shorten time to market, reduce costs, and increase efficiency. It is capable of driving a wide range of output voltages from 0.8 to 15Volts and 50mA to 2A. The adjustable current limit allows the device to be used in a constant-current (boost and buck-boost) topologies. The LT3840IFE is suitable for a wide range of applications including automotive, ac/dc adapters, dc/dc converters for embedded systems, industrial/telecom systems, and consumer electronics.

Working Principle

The LT3840IFE is a synchronous buck DC/DC controller that operates in the Fixed Frequency Voltage Mode. It is designed to optimize the overall system efficiency and simplify design and layout. The LT3840IFT work by providing an adjustable voltage reference that needs to be optimized with the following external components: high side switch, output capacitor, and inductor. The high side switch is driven on/off through an internal gate driver, while the output voltage is regulated by an external loop and feedback capacitor. The enable pin is used to activate or inactivate the controller.

Conclusion

The LT3840IFE is a high-performance, synchronous step-down DC/DC controller with an adjustable current limit and a wide range of output voltages. It allows for the development of efficient power supplies, helping to improve performance, reduce costs and increase efficiency. The device can be used in a variety of applications and is ideal for automotive, AHC/DC adaptors, and embedded systems.

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