MAX5921AESA+

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The MAX5921AESA+ is a high-current Hot Swap controller for hot insertion and removal of card-type boards, backplanes and power supply input lines. It offers user-configurable programmable thresholds and current-limit values, and features keep-alive current scheme and power sequencing, and during the insertion/removal process sequential monitoring of the power lines. It is specifically designed with the power-over-load and transient conditions to protect card-type systems.

Application Field

The MAX5921AESA+ is particularly suitable for use in systems with various power sources where the power is being hot-swapped on a card-type system. It is suitable for telecommunication, medical, industrial and research applications where high-power systems are frequently plugged and unplugged. It is also suited for hot-plug Power over Ethernet (PoE) applications, where power supplies can be remotely inserted and removed without interrupting the network. The MAX5921AESA+ is also a great choice for applications requiring fail-safe power management and built-in hot plug controls.

Working Principle

The MAX5921AESA+ Hot Swap controller features an adaptive slew-rate control circuit and programmable current limit, which helps to reduce remote stress during insertion. When powered, the device repeatedly monitors the power voltage rails to verify the power supply voltage levels. It continually senses the bus voltage levels and provides an accurate reading of the power supplies. The combination of these two circuits, together with user-configurable programmable thresholds and current-limit values, offers a unique solution for uninterrupted power when card-type boards are being hot-swapped.

The MAX5921A ESA+ also features a configurable Adapter Card (AC) Detection Scheme. This ensures that the power inputs from a given AC source are “seen”, and it allows for a more reliable management of power connections and disconnects. In addition to these features, the MAX5921AESA+ offers an adjustable power-on sequencer. The sequencer configures the power supply outputs according to user-defined specifications, so that no power state surprises the system during hot-swap operations.

The MAX5921AESA+ Hot Swap controller features an Overload Protection circuit. This circuit trips when the device is sensing an excessive load on its power rails, thus preventing the excessive drain of power and protecting the device from overloading. Its complementary feature, Current Repetition, allows the device to repeat its Overload Protection Settings when its power rails are subjected to a cycle of power on/off.

The Hot Swap controller is also capable of providing Keep-Alive current to card-type systems during the hot-swap insertion/removal process. This eliminates the need for a manual connection to the power rails during the hot-swap process, thereby improving user safety when performing the transition. Additionally, the MAX5921AESA+ provides an adjustable, programmable over-voltage protection (OVP) circuit, alerting system administrators to over-voltage conditions before any damage to components can occur.

In conclusion, the MAX5921AESA+ Hot Swap controller offers a number of features and benefits to power management solutions. Its user-configurable programmable thresholds and current limit values, coupled with fail-safe power management and built-in hot-swap controls, make it an ideal solution for hot-swap systems. Its Overload Protection circuit, Keep-Alive current, and Over Voltage Protection (OVP) circuit offer system administrators a reliable and efficient way to manage power in their card-type systems.

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