MAX5919AEEE+

Power management integrated circuits (PMICs) are an important part of modern electronic systems, as they are responsible for providing the power needed by other components in an efficient and safe way. Hot-swap controllers are a specific type of PMICs that allow a device to be plug and removed from a system without the need to turn off the power supply.

The MAX5919AEEE+ is a hot-swap controller that is used to provide a smooth and safe current transition when in-rushing loads are added or removed from a system. The MAX5919AEEE+ works by using a current-mode control circuit in combination with a synchronized gate driver in order to protect against in-rush currents on hot plug events and can also be used to protect devices against overvoltage and undervoltage conditions. It also features a thermal compensation loop that helps protect against the effects of temperature on its operation.

Applications

The MAX5919AEEE+ is designed for applications with up to 8A continous current and short peaks up to 15A. Such applications include hot-swap, inrush current control, overvoltage protection (OVP) and undervoltage protection (UVP).

• Hot-Swap
  • Inter-board connections
  • Unit to unit Hot Plugging
  • Hot Plugging of Powered Components
• Inrush Current Limiting
  • Power Supplies
  • Electric vehicles
  • Battery loaders/chargers
• Overvoltage Protection (OVP)
  • Automotive systems
  • Industrial systems
  • Telecommunications systems
• Undervoltage Protection (UVP)
  • Power Supplies
  • Electric vehicles
  • Battery loaders/chargers

Functional Block Diagram

The MAX5919AEEE+ consists of several functional blocks that are controlled by an analog current-mode control circuit. These blocks are:

• POWER INPUT - This provides the main power input for the device.
• PROTECTION CIRCUIT - This protects the device against overvoltage, undervoltage and overcurrent conditions.
• SYNCHRONIZED GATE DRIVER - This controls the switches on the device.
• THERMAL PROTECTION CIRCUIT - This helps protect the device against overheating.
• OUTPUT CIRCUIT - This provides the regulated output voltage.

Working Principle

The MAX5919AEEE+ works by using two main control loops: the current-mode control loop and the temperature compensation loop. The current-mode control loop works by constantly measuring the voltage across the sense resistor and based on this value; it adjusts the switches accordingly in order to control the current flowing through the load. The temperature compensation loop works by monitoring the temperature of the device and based on this value; it adjusts the switching frequency to ensure proper operation and protect the device from overheating.

The MAX5919AEEE+ also has an Input Voltage Range (IVR) block that allows it to be configured to switch at different voltages. The user can choose between two different range settings (2.7V-3.3V or 4V-5.5V) and it also has a latch pin which can be used to latch the device in case of a fault condition.

Conclusion

The MAX5919AEEE+ is a hot-swap controller from Maxim Integrated that is used in applications that require inrush current limit, overvoltage protection, and undervoltage protection. It works by using a current-mode control loop and a synchronized gate driver to ensure smooth and safe current transitions when loads are added or removed. The device also has an input voltage range block and a thermal protection circuit that help protect it against overcurrent, overvoltage, and over temperature conditions.