LT3575EFE#PBF

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LT3575EFE#PBF: DC DC Switching Regulator Application and Working Principle

The LT3575EFE#PBF is a DC-DC switching regulator from the regulator class of Voltage Regulators, or PMICs. This regulator is designed for high efficiency applications, and offers a wide array of features for its purpose. It is a fully integrated solution, requiring minimal external components for operation, and an on-chip protected power transistor as well, which makes it easier and safer to use.

Features

The primary features associated with the LT3575EFE#PBF are as follows:

• Wide operating temperature range: -40°C to +85°C
• Ultra-fast transient response
• Built-in voltage supervision for output and switch
• High efficiency, up to 85%
• Isolated and non-isolated output Polarity control logic
• UL certification
• Up to 3A output current
• Low quiescent current

All of these highly desirable features make the LT3575EFE#PBF a great choice for low-voltage, high-efficiency applications.

Applications

The LT3575EFE#PBF is widely applicable, offered in surface-mount packages. It can be used in a variety of applications such as portable device power supplies, high efficiency DC-DC support, laptop adapter and battery charger, as well as automotive auxiliary power supplies.

Working Principle

Generally speaking, the LT3575EFE#PBF works in a constantly switching between two different operational states (fast-charging and fast-discharging) in order to maintain a consistent output voltage when connected to the mains. This type of regulating circuit uses two voltage-sensing input pins, the upper and lower set points, to detect the amount of voltage passing through the input terminals, and then switches between the two states to maintain the output level. When the voltage is higher than the upper set point, the LT3575EFE#PBF will enter a fast-charging state in which it switches the connecting circuit to the input power supply in order to reduce the load and increase the load current; while when the voltage drops below the lower set point, the device switches the connecting circuit to an internal fast-discharge circuit to increase the load current and maintain the desired output voltage.

This type of regulating principle offers the most efficient, reliable, and flexible solution for high-efficiency applications where output voltage levels need to be maintained.

Conclusion

In conclusion, the LT3575EFE#PBF is a voltage regulator from the PMIC family, specifically from the DC-DC switching regulator class, that offers high efficiency, fast transient response, wide operating temperature range, and other features for a wide range of applications that require high-efficiency regulating. Additionally, it operates on the principle of fast-charging and fast-discharging to maintain a stable output voltage.

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