Circuit-Breaker and Ideal Diode Controller with Digital Monitoring Functions

Part Number	Status
MAX5968	Custom Order: Minimum order quantities and other restrictions may apply.

The MAX5968 soft-switch and ideal diode controller protects systems with redundant DC-DC converter modules against failure of the converter by controlling external n-channel MOSFETs at the input and output of the converter. Input short-circuit and overload current protection is provided by means of a current-sense amplifier connected to a sense resistor that resides at the source of the external protection MOSFET. If a failure occurs at the input of the associated converter, the MAX5968 protects the input supply by pulling the gate of the input protection MOSFET low and disconnecting the failed converter. Similarly, if there is a failure at the output of the redundant converter, the MAX5968 detects the reverse potential across the output MOSFET and pulls the gate low to disconnect the failed converter from the load. The MAX5968 features VariableSpeed/BiLevel™ input circuit-breaker protection.

The MAX5968 also integrates a 10-bit ADC that monitors converter input current, load voltage, and output MOSFET forward voltage. An analog input (ADCIN) is provided to monitor a temperature signal from the associated converter. The MAX5968 features two 10-bit circular buffers that contain a history of the 50 most recent input current and output load voltage digital conversion results. This data helps to diagnose and troubleshoot converter failures. All ADC results, including circular buffers and several configuration registers are accessible through a 400kHz I²C interface.

Digital limits for overvoltage and undervoltage warning are user programmable. An active-low ALERT output notifies the system controller of any failure condition that arises or requires attention. When any of the measured signals violates digitally programmable limits, the active-low ALERT output is asserted.

A precision ON comparator input can be used to implement programmable undervoltage lockout for the input and output MOSFET drivers.

An open-drain active-low READY output can be used to enable the associated DC-DC converter by releasing the converter’s enable input when both the input and output MOSFETs are fully enhanced.

Two general-purpose I/Os can be fully configured through the I²C interface to provide external indications or to control additional peripheral devices.

The MAX5968 is available in a 28-pin thin QFN package and operates over the -40°C to +125°C temperature range.

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