MAX5950ETJ+

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PMIC - Hot Swap Controllers

The MAX5950ETJ+ is a PMIC - Hot Swap Controller from Texas Instruments. It is designed to control and protect hot-swap circuitry for up to three independent systems powered from an unregulated bus. It provides extra current with low power dissipation, provides reverse current protection, and regulates inrush current when powering up the system.

The MAX5950ETJ+ comprises components to control the on-off sequencing and the over-current protection of the hot-swap system. It includes a 3-channel current limit comparator, 3 independent output states (OFF/ON/LED), 3 isolated current sense amplifiers, and a high-side power MOSFET gate driver. It integrates 3 current-sense amplifiers to measure the hot-swap current, and to generate an accurate current limit threshold. It also contains voltage references to generate the fault thresholds, which are transferable between the settings of three independent current limits.

Application Field

The MAX5950ETJ+ is typically used in computing, communications, consumer and industrial applications. It can power various output boards such as DDR3 memory, PCIe drives, and graphics cards. This IC is well-suited for hot-swap applications involving servers, power supplies, storage, and buses. Moreover, it is used in hard disk enclosures, RAID systems, PCI testing, wireless communication systems, network switches, and blade servers.

Working Principle

The Control Input of the MAX5950ETJ+ is used to enable or disable the hot-swap FET driver. After the hot-swap devices are enabled, power from the unregulated source should be supplied to devices in the system. The MAX5950ETJ+ then monitors the current through devices and maintains it below the programmed current limit threshold. If the current reaches the threshold level, the MAX5950ETJ+ turns OFF the hot-swap devices for a minimal period of time.

The MAX5950ETJ+ also provides an over-voltage protection (OVP) against any high voltage from the power source. The Response time of the protection circuit is programmable, and also provides an Overtemperature control that limits the power dissipation of the hot-swap devices.

Overall, the MAX5950ETJ+ is a versatile hot-swap controller that provides power control, current limit, over-voltage, and overtemperature protection. This IC is ideal for any system that needs hot-swap current protection, power-up sequencing, and current-limit protection. It is available in an 8-pin SOIC thermal pad, 10-pin TSSOP, or 8-pin µMAX packages.

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