Dual Ideal Diodes feature 15-mV forward voltage

Dual Ideal Diodes feature 15-mV forward voltage

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By eeNews Europe

The LTC4415’s ultralow 15 mV forward voltage is lower than a Schottky diode, thereby extending battery run time and operating voltage range while ensuring no oscillations during supply switchover. Low 50 mOhm on-resistance reduces power loss and heat.

The LTC4415 enables two power supplies to operate together with less than 1 µA of reverse current flow from the OUT pin back to the IN pin, ensuring highly efficient Diode-ORing of the power sources. The IC operates down to 1.7 V and up to 5.5 V, aligning well with supercapacitor backup systems and supporting the trend toward lower voltage supply rails.

Other applications include systems that typically take power from multiple input sources, such as high current PowerPath switches, uninterruptible power supplies, battery backup systems, emergency systems with battery backups, and logic-controlled power switches, as well as automotive and industrial systems.

The LTC4415’s maximum forward current in each ideal diode is adjustable up to 4 A for system flexibility, while the IC consumes less than 45 µA quiescent current. The ideal diode currents can be monitored via current limit adjust pin voltages.

The two ideal diodes are independently enabled and can optionally be prioritized using complimentary inputs EN1 and /EN2 with precision thresholds. If either of the output voltages exceeds its respective input voltage, that ideal diode is turned off, and open drain status pins indicate the conduction status. When the die temperature approaches thermal shutdown, or if the output load exceeds the current limit threshold, the corresponding warning pins are pulled low. Internal thermal limiting circuits protect the device during fault conditions while soft-start limits inrush current at start-up.
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