Maxim Integrated Products introduces the MAX4959/MAX4960 overvoltage-protection (OVP) controllers with battery-switchover functionality. Designed to protect low-voltage systems up to 28V, these 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 ideal for low-voltage systems such as ultra-mobile PCs, notebooks, and camcorders.
The MAX4959/MAX4960 provide ±15kV ESD protection on the input when the input is bypassed with an external 1µF ceramic capacitor. These controllers are fully specified over the -40°C to 85°C extended temperature range, and are available in 2x2mm, 10-pin microDFN and 3x5mm, 10-pin microMAX(R) packages.
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