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OVP controllers protect low-voltage systems up to 28V

Posted: 10 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:high-voltage? overvoltage protection controllers? battery switchover functionality? voltage regulator?

Maxim Integrated Products has launched overvoltage-protection (OVP) controllers with battery-switchover functionality designed to protect low-voltage systems up to 28V. The devices provide resistor-programmable overvoltage (6V to 28V) and undervoltage (5V to 28V) trip levels. To implement this OVP and prevent damage to protected components, the MAX4959/MAX4960 turn off an external pFET when the input voltage exceeds the overvoltage threshold. Subsequently, they hold the external pFET off until the input voltage rises above the undervoltage-lockout (UVLO) threshold. These controllers also feature a control-bit pin that switches to the battery when the host system detects a disconnect at the AC adapter. This combination of OVP and battery-switchover functionality makes the MAX4959/MAX4960 suitable for low-voltage systems such as ultramobile PCs, notebooks and camcorders.

The MAX4959/MAX4960 provide 15kV ESD protection (Human Body Model) on the input when the input is bypassed with an external 1?F ceramic capacitor. These controllers are fully specified over the -40C to +85C extended temperature range, and are available in 2mm x 2mm, 10pin microDFN and 3mm x 5mm, 10pin microMAX packages. Prices start at 90 cents each for orders of 1,000 or more.




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