LT8361HMSE#TRPBF

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LT8361HMSE#TRPBF Application Field and Working Principle

The LT8361HMSE#TRPBF is a high-performance, monolithic, synchronous DC-DC switching regulator specifically designed to minimize the size and cost of high current power systems. This IC is part of the family of PMIC Voltage Regulators, DC-DC Switching Regulators.

The device integrates two DC-DC step-down (buck) controllers and each one is equipped with two high-efficiency N-channel MOSFET switches and four integrated power switches optimized for 1.2MHz to 2.7MHz peak current-mode operation. It supports input voltages from 4.5V to 42V, and can provide an output power of up to 30W.

Features of the LT8361HMSE#TRPBF include input undervoltage lockout, output overvoltage protection, adjustable soft-start, programmable current limit, precision output voltage accuracy, low-noise current-mode control as well as overcurrent protection, thermal overload protection and short circuit protection.

Features and Benefits

• Wide Input Voltage Range: 4.5 to 42V
• High Efficiency: Up to 95%
• High Output Current: Up to 3 A
• Integrated Power Switches: N-channel MOSFETs
• Low-Noise: 125µVP-P @ 1MHz
• Programmable Frequency: 1.2MHz to 2.7MHz
• Power Savings Mode: Power-down or Iq Control
• Other Features: Oscillator Synchronization, Soft-Start, Overcurrent Protection and Short Circuit Protection

Typical Application

The LT8361HMSE#TRPBF DC-DC buck switching regulator is ideally suited for a wide range of applications including but not limited to industrial, consumer, and automotive applications. Some typical applications include Active ORing, Active Clamping, Active Inrush Control, Security and Automotive Systems, and regulators for high current buck converters.

Working Principle

The LT8361HMSE#TRPBF DC-DC switching regulator operates with a fixed frequency, current mode control scheme. It implements a peak current control technique that provides stable and reliable operation at a wide range of input and output voltages. The operating frequency is adjustable from 1.2MHz to 2.7MHz, allowing the user to optimize performance for a given application. The current mode control scheme also provides excellent fast-transient response characteristics.

The output voltage is set by a single external resistor. When the output is actively controlled, the control loop is closed by adjusting the duty cycle of the internal MOSFET switches through an internal error amplifier. The voltage across a current sensing resistor is compared to an internal reference voltage in order to regulate the output voltage. If no external feedback is used, the device into a fixed output voltage mode.

In addition to the voltage control, the device includes overcurrent, thermal overload and short-circuit protection features. In fault conditions, the device will shut down or limit the output current accordingly. Additionally, the device has a power-down or Iq control mode for low power applications.

Conclusion

The LT8361HMSE#TRPBF DC-DC switching regulator is a versatile, high-efficiency, low-noise IC that is designed for a wide range of applications. It features a wide input voltage range, up to 30W of output power, and an adjustable operating frequency of up to 2.7MHz. It also has several protection features that ensure reliable and safe operation. This device is ideal for applications where board space and cost are key parameters.

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