LTC4245IG#PBF

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The LTC4245IG#PBF is an ideal choice for hot-swap controllers. This device is best suited for applications where a hot-swap circuit must be tightly regulated at a user-selected voltage level. The LTC4245IG#PBF typically includes a user-programmable voltage control loop with an external MOSFET for current limiting, short-circuit protection, and over-temperature protection. The LTC4245IG#PBF provides a wide range of adjustable current output levels to ensure safe insertion of live cards in high voltages. The device is well-suited for a broad range of AC/DC applications including telecommunications and data storage.

The LTC4245IG#PBF’s integrated output discharge enable (ODE) feature allows for faster system power-up and power-down with minimal stress on the power supply components. The ODE functions to safely discharge the output node on system power events. This feature can be set to discharge the output node during a power-down event, or during a power-up event. The ODE also prevents the output node from increasing above a user-defined voltage during a power-up event.

The LTC4245IG#PBF provides many useful features including hot-swap current limiting, foldback current limiting, and user-selectable threshold voltages. In addition, the LTC4245IG#PBF includes an optional overtemperature warning sensor, as well as a narrow-band reference sensing for improved voltage regulation accuracy. With a wide operating temperature range, the LTC4245IG#PBF can be used in a variety of applications where precise voltage control is needed.

The LTC4245IG#PBF utilizes a charge pump architecture to maintain precise voltageregulation. In operation, the device compares the voltage on its OUT terminal to atrimmed reference voltage, typically 1.235V. If the OUT voltage drops below thereference, the Charge Pump turns ON, increasing the OUT voltage. Conversely, ifthe voltage on the OUT terminal is greater than the reference, the Charge Pumpturns OFF, allowing the OUT terminal to discharge.

In order to keep the charge pump shut-off voltage at the correct level, a feedback loop is used to monitor the OUT terminal. This is done by connecting the OUT terminal to an Error Amp, which compares the OUT voltage with a reference voltage. If the OUT voltage is higher than the reference, the Error Amp shutdowns the Charge Pump. By using this method, the Charge Pump can maintain the correct OUT terminal voltage.

The LTC4245IG#PBF is an ideal choice for hot-swap controllers that require precise voltage control. The device includes a wide range of adjustable current output levels, an integrated output discharge enable (ODE) feature, hot-swap current limiting, foldback current limiting, user-selectable threshold voltages, and more. With its wide operating temperature range and precise voltage regulation, the LTC4245IG#PBF is the perfect choice for a broad range of applications.

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