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MAX4840A：Overvoltage-Protection Controllers with Status Flag

Prevent Damage to Electronic Components if a Wrong Adapter Is Plugged In

The MAX4838A/MAX4840A/MAX4842A 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 MAX4838A/MAX4840A/MAX4842A 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 MAX4838A has a 7.4V overvoltage threshold, and the MAX4840A has a 5.8V overvoltage threshold. The MAX4842A has a 4.7V overvoltage threshold. The MAX4838A/MAX4840A have an undervoltage lockout (UVLO) threshold of 3.25V while the MAX4842A has a UVLO of 2.5V. 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. Active-low FLAG is held low for an additional 50ms after GATE goes high before deasserting. The MAX4838A/MAX4840A/MAX4842A have an open-drain active-low FLAG output. Active-low FLAG output asserts immediately to an overvoltage fault. Additional features include a ±15kV (HBM) ESD-protected input (when bypassed with a 1µF capacitor) and a shutdown pin (active-low EN) to turn off the device. All devices are offered in a small 6-pin SC70 package and 6-pin 1.5mm x 1.0mm µDFN packages and are specified over the extended temperature range of -40°C to +85°C.

Key Features Overvoltage Protection Up to +28V Preset 7.4V or 5.8V Overvoltage Trip Level Drives Low-Cost nMOS FET Internal 50ms Startup Delay Internal Charge Pump Undervoltage Lockout ±15kV ESD-Protected Input Voltage Fault Active-Low FLAG Indicator 6-Pin SC70 Package and µDFN packages Lead-Free

MAX4838A, MAX4840A, MAX4842A: Typical Operating Circuit Applications/Uses Cell Phones Digital Still Cameras MP3 Players PDAs and Palmtop Devices

DataSheet

Parametrics

Quality and Environmental Data

• MAX4840A.pdf

Related Products

• MAX4840：Overvoltage Protection Controllers with Status FLAG
• MAX4838：Overvoltage Protection Controllers with Status FLAG
• MAX4842：Overvoltage Protection Controllers with Status FLAG

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