GENERAL DESCRIPTION
An internal switch powers the circuitry from whichever input voltage is higher. The current limit response time to a short circuit is typically 1μs. The internal P-channel MOSFET switches are configured to break before make; that is, both switches cannot be closed at the same time. Controlled by a 2-bit parallel interface, the four states for VCC are VCC5, VCC3, high impedance, or ground. When in the ground state, VCC is pulled to ground by a 5k resistor. An open drain FAULT output is asserted during overcurrent conditions. During power-up slewing, FAULT also signals that VCC is out of tolerance. An internal overtemperature sensor forces VCC to a high impedance state when an over-temperature condition exists. Quiescent current is typically a low 15μA, as long as ICC is less than approximately 500mA. Above this load current, the quiescent current increases to 200μA. The AAT4650 is available in a Pb-free, 8-pin SOP package and is specified over the -40°C to +85°C temperature range.
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