LTC4245CUHF#PBF

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PMIC - Hot Swap Controllers

The LTC4245CUHF#PBF is a low-voltage, low-frequency, Hot Swap controller. It provides highly reliable, automatic power control for smoothly and safely adding and removing system peripheral boards from a powered-up system. This is achieved through internal current sensing and MOSFET gate control. The device works in both forward and reverse input polarities and its maximum switch current is typically 0.6A. Its low minimum operating current, 0.4μA, creates extremely minimal power dissipation in its minimum current mode, which results in minimum power usage.

This Hot Swap controller has several features that make it an ideal solution for many applications. Its tight control loop features low output impedance, which reduces coupling noise and helps to maintain a stable output voltage. It also offers configurable current limiting, programmable over-voltage protection (OVP) and foldback current limit. These features ensure safety, robustness, and prevents catastrophic failures through continual monitoring.

In order to remain current-limited and in thermal shutdown mode, the LTC4245CUHF#PBF also employs a Temperature-Sensing MOSFET (TSM). This feature allows the device to monitor its own temperature in cases of prolonged overload or shutdown conditions, which helps prevents system thermal faults in critical applications.

The LTC4245CUHF#PBF provides dual current limit pins and operates on both AC and DC supplies of ≤ 50V, making it ideal for a variety of applications such as Hot Swap in telecommunications and LAN systems, high-current power modules, rack power supplies, datacenter power supplies, and many other industries. Additionally, the device is compatible with lead-free assembly processes and UL 1604 certified, making it a safe and reliable choice.

In its most basic operation, the LTC4245CUHF#PBF acts as a power switch. When activated, the device\'s internal switches turn on providing the load with power according to the current limit setting. This can be done through a manual switch, external sense resistor, or by monitoring the input line for current flow. Once the set current limit is reached, the device\'s internal comparator shuts off the internal switch to prevent the power supply from exceeding its maximum current load. This is achieved by sensing the voltage drop across the control resistor. Additionally, the device has selectable foldback current limiting, which decreases the current limit based on the sense voltage. This feature ensures the device will stay within its power limits without tripping any of its protective features.

The LTC4245CUHF#PBF is the ideal Hot Swap and protection solution. With its low minimum operating current, tight control loop, configurable current limiting, and Temperature-Sensing MOSFET feature, it is a safe, robust, and reliable solution for many applications. With its dual current limit pins and wide operating voltage range, the device provides an excellent power supply solution.

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