LT3845IFE#TRPBF

LT3845IFE#TRPBF Application Field and Working Principle

• PMIC - Voltage Regulators - DC-DC Switching Controllers

The LT3845IFE#TRPBF is a synchronous buck controller that provides regulated output voltage for systems that operate from 4.5 to 60 V supply voltages and require up to 10 A output current. The device offers a wide range of features to enable efficient and reliable voltage conversion while maintaining high efficiency. The LT3845IFE#TRPBF is designed to power off-line AC-DC, DC-DC, motor control, and other low power designs. Its advanced features improve efficiency, reduce component counts, and enhance design flexibility.

The LT3845IFE#TRPBF switching controller provides the current-sense and power-switching mechanism for the buck converter. Its two main functions are to convert a higher input voltage to a low output voltage, and to regulate the output voltage to maintain a constant value despite any changes to the input voltage.

The LT3845IFE#TRPBF contains an integrated dual N-channel MOSFET driver, designed to drive the high side and low side MOSFET in a synchronous buck converter. The built-in logic block output will automatically sense the switching frequency or allow an external clock to control the frequency. This controller operates in a fixed frequency Continuously Conduction Mode. Synchronization of the switching frequency is accomplished by the shutdown pin or by adding a resistive divider to the FB pin.

In addition to the integrated driver and logic block, the LT3845IFE#TRPBF also has several other features that improve design flexibility and efficiency, such as adjustable soft-start and programmable under-voltage lockout (UVLO), adjustable current-limit, and power-good indicator. The LT3845IFE#TRPBF also includes a short-circuit protection feature that will automatically shut down the MOSFETs if the current reaches an unsafe level.

The LT3845IFE#TRPBF can operate with a wide range of supply voltages and loads, making it an ideal choice for a wide variety of applications, such as voltage-conversion, motor-control, DC-DC step-down, and other power supply applications. Whether used in a synchronous or asynchronous buck converter, the LT3845IFE#TRPBF is designed to provide efficient and reliable voltage conversion while maintaining high efficiency.