Maxim’s MAX4959/MAX4960 are overvoltage-protection (OVP) controllers with battery-switchover functionality.
Designed to protect low-voltage systems up to 28 V, these devices provide resistor-programmable overvoltage (6 V to 28 V) and undervoltage (5 V to 28 V) trip levels.
To implement this OVP and prevent damage to protected components, the devices 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 disconnection at the AC adapter. This combination of OVP and battery-switchover functionality makes the controllers ideal for low-voltage systems such as ultra-mobile PCs, notebooks and camcorders.
The modules provide ±15 kV ESD protection on the input when the input is bypassed with an external 1 μF ceramic capacitor. They are available in 2 mm x 2 mm, 10-pin microDFN and 3 mm x 5 mm, 10-pin microMAX packages.
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