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Partname: | MAX4839EXT |
Description: | Overvoltage Protection Controllers with Status FLAG |
Manufacturer: | Maxim Integrated Products |
Datasheet: | PDF (784K). Click here to download *) |
The MAX4838MAX4842 are overvoltage protection ICs that protect low-voltage systems against voltages of up to 28V. If the input voltage exceeds the overvoltage trip level, the MAX4838MAX4842 turn off the low-cost external n-channel FET(s) to prevent damage to the protected components. An internal charge pump eliminates the need for external capacitors and drives the FET gate for a simple, robust solution. The MAX4838/MAX4839 have a 7.4V overvoltage threshold, and the MAX4840/MAX4841 have a 5.8V overvoltage threshold. The MAX4842 has a 4.7V overvoltage threshold. The MAX4838MAX4841 have an undervoltage lockout (UVLO) threshold of 3.25V while the MAX4842 has a UVLO of 3.0V. In addition to the single FET configuration, the devices can be configured with back-to-back external FETs to prevent currents from being back-driven into the adapter. On power-up, the device waits for 50ms before driving GATE high. FLAG is held low for an additional 50ms after GATE goes high before deasserting. The MAX4838/MAX4840/MAX4842 have an open-drain FLAG output, and the MAX4839/MAX4841 have a pushpull FLAG output. The FLAG output asserts immediately to an overvoltage fault. |
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Click here to download MAX4839EXT Datasheet*) |
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