UCC3917DTR

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UCC3917DTR is an electronic device that provides precise voltage sensing, precise current sensing, and precise timing for controlling power distribution in hot-swap applications. It is a type of Power Management IC (PMIC) called a Hot Swap Controller, designed to enable safe and reliable insertion/removal of hot-pluggable devices into/from a live system. The IC operates from an input voltage of 4.5V to 36V, and allows the controlled powering up, powering down, and loop regulation of a wide range of DC/DC converters.

Features

UCC3917DTR has many unique features that make it suitable for power system design.

• Wide input voltage range: 4.5V to 36V
• Overvoltage protection to up to 38.5V
• Undervoltage detection down to 3.95V
• Adjustable restart threshold
• On-chip precision current sensing
• Independent quick-start and time-out timers
• On-chip temperature sensing
• Low control current and low shutdown current

Application field

UCC3917DTR is ideal for a wide range of applications, such as server systems, printers and copiers, data storage devices, automotive, and industrial systems. It is particularly suited to hot-swap applications, where the device is inserted and removed while the power system is live, such as PCIe cards and memory modules. The IC allows precise control of the power-up and power-down of the system, preventing the damage that can be caused by surges of current and voltage when hot-swapping delicate components.

The device can be used as a power switch in automotive power systems, providing over-voltage protection and shutdown capabilities. It is also suitable for ultra-low power applications, providing a low-power shut-down mode and independent restart and time-out timing options.

Working principle

UCC3917DTR operates on an input voltage between 4.5 and 36V, providing precision voltage and current sensing, overvoltage and undervoltage detection, and independent timers. The device has four output pins, one for each phase, that can be used to power an external load, such as a DC/DC converter.

When the device is powered for the first time, it begins a startup sequence, gradually increasing its output current. When the output current reaches a preset threshold, the device stops its startup sequence and monitors the output voltage. If the voltage drops below a certain level, the device resets and a new startup sequence is initiated. If the voltage is above the preset level, the device turns off its output and enters Standby mode.

The device also monitors the input current to detect over-currents and provides protection against overvoltage. It has two outputs: one is an active-low fault signal to indicate an overvoltage condition, and the other is a power-on reset output. The device also has an on-chip temperature sensor to provide temperature protection, allowing the system to shut down safely if the temperature exceeds a preset limit.

UCC3917DTR is a versatile Power Management IC that is suitable for a wide range of applications. Its features make it an ideal choice for hot-swap applications, providing precise control of the power-up and power-down of delicate components.

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