MAX4845

IN to GND ...................................................-0.3V to +30V
GATE to GND ...............................................-0.3V to +12V
FLAG to GND .................................................-0.3V to +6V
Continuous Power Dissipation (T_A = +70°C)
6-Pin DFN (derate 2.1mW/°C above +70°C) ..167.7mW
Operating Temperature Range ...............-40°C to +85°C
Junction Temperature .......................................... +150°C
Storage Temperature Range .................-65°C to +150°C
Lead Temperature (soldering, 10s) ...................... +300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The MAX4845 overvoltage protection controllers protect low-voltage systems against high-voltage faults of up to 28V. When the input voltage exceeds the overvoltage threshold, the MAX4845 turn off a 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 overvoltage trip level is set to 7.4V (MAX4843), 6.35V (MAX4844), 5.8V (MAX4845), or 4.65V (MAX4846). When the input voltage drops below the undervoltage lockout (UVLO) threshold, the devices enter a low standby current mode (10A). The MAX4843/MAX4844/ MAX4845 have a UVLO threshold of 4.15V, and the MAX4846 has a UVLO threshold 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.

An additional feature of MAX4845 includes a ±15kV ESD-protected input when bypassed with a 1F capacitor to ground. All devices are offered in a small (1.5mm x 1.0mm) 6-pin DFN package and are specified for operation over the -40°C to +85°C temperature range.