LTC3862EUH#PBF

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LTC3862EUH#PBF Application Field and Working Principle

LTC3862EUH#PBF is an advanced, high-efficiency, synchronous step-down switching controller with a user-selectable maximum current limit for automatic output power control. It is suitable for DC/DC conversion and power supply control of a wide range of applications such as cellular phones, gaming systems, and advanced embedded systems.

Application Field

LTC3862EUH#PBF is mostly used in the area of power management. It is designed to be used in different types of converters and applications, including point-of-load, distributed power systems, buck, boost and other switch mode converters/power systems. As a result, it has become an ideal choice for applications where robust load transient response, high-efficiency, and low power dissipation are required. The device is capable of supporting a wide range of output voltage, output current, and switching frequency, making it an adaptable device for different types of applications.The device features an internal feature called Adaptive On-Time Control, which enables optimum switching frequency and divider ratio without the need for an external resistor, thus providing greater flexibility for the output stage. Additionally, the chip is also integrated with a Constant VOUT, a Soft Start feature, a constant current limit option and a fast transient response. Moreover, the device also features UVLO and thermal shutdown protection.

Working Principles

The LTC3862EUH#PBF works on the synchronous buck switching converter principle. The block diagram comprises of two main sections, namely, the power stage and the control section. The power stage comprises of a power MOSFET switch and the associated drive circuitry. The control section consists of an error amplifier, voltage reference, external feedback components, and an on-time control loop. The error amplifier compares the output voltage and reference voltage to generate a control signal. This signal is used to control the on-time of the controller by operating the gate voltage of the power MOSFET switch. The on-time of the device is set by the user-defined constant on-time control or adaptive on-time control. The Adaptive On-Time Control is based on the principle of adjusting the maximum on-time according to the average load current, ensuring that the average load current does not exceed the set current limit or the preset of the over-current limit, thus improving efficiency and providing optimal power control.The LTC3862EUH#PBF also features a Constant VOUT mode, which allows the user to set a constant output voltage without the need for any external components. This mode is particularly useful when powering low-power devices, such as linear regulators and power LEDs.Finally, the Selectable Frequency, Soft Start, and Fast Transient Response feature of the device, along with the built-in power MOSFET protection, provides enhanced system reliability and robust performance.

Conclusion

The LTC3862EUH#PBF is an advanced synchronous buck switching controller designed for DC/DC conversions and power supply control of a wide range of applications. It features a user-selectable maximum current limit, an adaptive on-time control, a constant VOUT mode, and a selectable frequency, among other features. This makes it an ideal choice for solutions requiring robust load transient response, high-efficiency, low power dissipation, and enhanced system reliability.

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