MIC2085-LBQS

Introduction

The MIC2085-LBQS is a smart hot swap controller from Microchip, designed to manage hot plugging of high current peripheral power supplies. The device is designed to control two N-channel MOSFETs in an arrangement that allows current to flow from a power source to a load without the need for a power source switch. This device is suitable for applications such as hot-swap, portable battery charging, and other devices that need to be powered without long delays. This paper will discuss the application field and working principle of the MIC2085-LBQS.

Application Field

The MIC2085-LBQS is designed for a variety of applications including, but not limited to, hot-swapping of high-current peripherals such as graphics cards, HDDs, and SSDs. The device\'s two N-channel MOSFETs are designed to provide a low impedance path for the current, allowing for minimal disruption of the current flowing from a high power source. Additionally, the device features high current ratings of up to 4.5 A, enabling it to handle even the highest current peripherals. Other applications include battery charging, portable devices, and other scenarios where a sudden increase in power is required.

The MIC2085-LBQS provides both protection and flexibility for numerous applications. Its high-current protection capabilities allow it to provide protection against over-current and over-temperature conditions, while its precision power management circuit ensures a smooth transition between input sources and the load. Additionally, the device includes several features that can be configured to prevent power disruption in case of an input supply shutdown or a sudden power outage.

Working Principle

The MIC2085-LBQS consists of two N-channel MOSFETs, an over-current protection circuit and a power-on reset (POR) circuit. The two MOSFETs are connected in series and are configured by the user to provide a low impedance path for the current under fault conditions, such as low input voltage, over-current, or over-temperature. The full circuit is protected from faults by the over-current protection circuit, which monitors for over-current conditions and shuts off the power supply.

When power is applied, the POR circuit ensures that the power supply is on and that the protection circuitry is enabled. The MOSFETs are then activated, allowing current to flow from the power source to the load. If the input voltage is lower than the voltage setpoint, the MOSFETs will not activate and the power supply will be shut off. If an over-current or over-temperature condition is detected, the protection circuitry will shut off the power supply.

The MIC2085-LBQS also provides a number of programmable parameters that can be used to customize the device\'s behavior. This includes, but is not limited to, the ability to adjust the input voltage setpoint, the over-current protection threshold and the over-temperature protection threshold. Additionally, the device can be programmed to automatically detect and restart the power supply in case of an input supply shutdown or a sudden power outage.

Conclusion

The MIC2085-LBQS is a smart hot swap controller designed to manage hot plugging of high-current peripherals. The device provides protection against over-current, over-temperature, and other faults, while also providing precise power management capabilities. Additionally, the MIC2085-LBQS includes several programmable parameters that can be customized to match the specific application.