LT8602ELXE#PBF

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LT8602ELXE#PBF is a low power, synchronous, Step-Down DC-DC converter from Linear Technology. This switching regulator features high efficiency, low quiescent current and simple adjustment of output voltage. It is designed to provide a regulated output from an input voltage of up to 36V; making it suitable for a wide range of applications. The device is a fully integrated step-down voltage regulator, incorporating a switch controller, high-side and low-side power MOSFETs and a current sensing circuit.

Applications

The LT8602ELXE#PBF is an attractive solution for a variety of applications, including digital and distributed power systems, industrial automation and computer peripheral power supplies, Post RegulationTM, portable equipment, and automotive systems. It is an excellent candidate for powering microprocessor, FPGA and ASIC core voltage regulators, where high efficiency is required with limited space. Additionally, the device is well suited for use in multi-rail systems, where low input-to-output differential and fast transient response is critical.

Working Principle

The LT8602ELXE#PBF features a synchronous rectifier topology. During normal operation, the power switch is pulsed on and off, which regulates the output voltage. This switching also reduces the power dissipation and improves the efficiency of the converter. The current-mode control loop is designed to provide an optimum transient response. A zero-voltage switching of the power switch is also enabled, further improving efficiency. The amount of current the power switch can supply is limited by the peak current sensing and limit circuitry integrated onto the device. The device’s output is also protected with overtemperature and overcurrent protection.

Temperature Regulation and Start-Up Control

The LT8602ELXE#PBF also employs a temperature control circuit to reject line regulation where the input voltage varies over time. The temperature control circuit senses the transistor temperature and reduces the amount of power delivered to the load if the temperature exceeds a programmed limit. Additionally, the device includes a regulated start-up current source to ensure a controlled turn-on of the power switch. This source is used during initial power-up until the output voltage reaches regulation.

Thermal Considerations

The LT8602ELXE#PBF is designed to operate within a specified temperature range. If the device is operated outside of this range, the device may be damaged or inefficient. Therefore, it is important to take thermal design into consideration when designing the power converter. The power switch can be the main source of heat, so a good thermal management system should be implemented to ensure the device does not reach its thermal limit. Additionally, the power switch can be externally controlled for optimum performance, benefitting applications in which the power switch has to switch at high frequencies.

Conclusion

The LT8602ELXE#PBF is a versatile, high-efficiency switching regulator that is capable of handling a wide range of applications. Its advanced features provide an excellent choice for providing regulated power with maximum efficiency. The device offers a low-noise regulator with fast transient response, as well as temperature and overcurrent protection. The LT8602ELXE#PBF provides an ideal solution for digital and distributed power systems, industrial automation, vehicle power applications and more.

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