The LTC4253CGN is a sophisticated negative voltage hot swap controller designed by Linear Technology to allow safe board insertion and removal from a live backplane. This device is housed in a 16-lead SSOP package and is specifically engineered for controlling negative supply voltages. Its primary function is to manage the inrush current to prevent the system voltage from drooping and protect the electronic components from damage due to sudden surges.

Key Features

• Wide Operating Range: The LTC4253CGN operates over a range of -48V to 0V, making it suitable for telecom and datacom applications where negative supply voltages are common.
• Adjustable Inrush Current Control: Users can adjust the inrush current limit through an external capacitor, which allows for customization based on specific system requirements.
• Gate Drive for External N-Channel MOSFET: The controller provides a gate drive for an external N-channel MOSFET, which is the primary power device used for controlling the current.
• Overcurrent Protection: The LTC4253CGN features robust overcurrent protection with an auto-retry function, which helps to protect the system from sustained overcurrent conditions.
• Under Voltage Lockout (UVLO): With UVLO, the device ensures that the MOSFET remains off if the supply voltage is too low, preventing malfunction.

Applications

The LTC4253CGN is ideal for a variety of applications, including:

• Telecommunications equipment
• Network servers and routers
• Industrial systems
• Central office switching
• Negative voltage power distribution systems

Reliability and Protection

Linear Technology's LTC4253CGN is designed with reliability in mind, featuring thermal shutdown to prevent overheating and a fault indicator for diagnostic purposes. The controller's ability to manage the power sequence of board insertion and removal ensures system stability and longevity.