MAX5955AUEE+

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PMIC - Hot Swap Controllers

The MAX5955AUEE+ is a low RDS(on) dual N-Channel MOSFET hot swap controller that prevents current overshoot, output over-voltage, and output under-voltage during power-up and power-down events. It is specifically designed to protect circuits from damage due to voltage transients during inrush current applications. The MAX5955AUEE+ provides adjustable current limit groups, as well as rated switch current, over-voltage detection, over-temperature protection, and user-configurable time-delay of the output switch. It operates from a wide input supply voltage range and provides up to 3A output current.

Application Field

The MAX5955AUEE+ is ideal for powering systems such as computer peripheral chipsets, mobile device battery chargers, and high-power system-on-chip power supplies. It is extremely versatile and can be used in various applications and products that require protection against current overshoot at power up and power down, as well as over voltage and over temperature protection.

Additionally, the MAX5955AUEE+ can be used as a hot-swap protection device in DC-DC converters, USB charging systems, and motherboards. It can also be used in multiple-voltage system applications, such as automotive and power management systems, to provide reliable protection.

Working Principle

The MAX5955AUEE+ achieves its primary function of preventing current overshoot, output over-voltage, and output under-voltage during power-up and power-down events through its unique circuitry. This circuitry is composed of two separate paths. The first is the N-Channel MOSFET (load switch) which prevents inrush current. The second is a voltage-based control loop that accurately limits the stable, steady-state output current. The MAX5955AUEE+ also provides adjustable current limit groups, as well as rated switch current, over-voltage detection, over-temperature protection, and user-configurable time-delay of the output switch.

The device deploys a technique called "tonschaltung", which is a German phrase meaning "constantly-to-on" or "frequently-on". This technique works by switching the N-Channel MOSFET "on" several times during a power-up event and then keeping it "on" (if a fault condition is not detected) until the power-down event. This action prevents the sudden, high level inrush current from flowing into the system, and ensure system-level protection.

The MAX5955AUEE+ also uses the voltage-based control loop to accurately limit the output current during steady-state operation. This loop uses a combination of current sensing and reference voltage to manage the output current. When the current sense voltage exceeds the threshold voltage, the MAX5955AUEE+ will reduce the output current automatically through an output on/off switch. The device also has a soft-start feature that prevents large voltage transients at the output during power-up events, and a power-down delay timer to keep the load switch off until the output voltage drops below a certain threshold.

Conclusion

The MAX5955AUEE+ is an ideal device for a wide range of applications that require protection against current overshoot, output over-voltage, and output under-voltage during power- up and power-down events. It utilizes a unique circuitry of two paths and features adjustable current limit groups, rated switch current, over-voltage detection, over-temperature protection, and user-configurable time-delay of the output switch. The MAX5955AUEE+ is extremely versatile and can be used in various applications, including DC-DC converters, USB charging systems, and motherboards, to provide reliable protection.

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