AAT4650

The AAT4650 SmartSwitch™ is a single channel PC Card (PCMCIA) power switch. AAT4650 is used to select between two different voltage inputs, each between 2.7V and 5.5V. An internal switch powers the circuitry from whichever input voltage is higher. The device's output, V_CC, is slew rate controlled and current limited, in compliance with PC Card specifications. The current limit response time to a short circuit is typically 1s. 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 V_CC are V_CC5, V_CC3, Hi-impedance, or Ground. When in the ground state, V_CC is pulled to ground by a 5k resistor. An open drain FAULT output is asserted during over-current conditions. During power up slewing, FAULT also signals that V_CC is out of tolerance. An internal over temperature sensor forces V_CC to a high impedance state when an over-temperature condition exists. Quiescent current is typically a low 15A, as long as I_CC is less than approximately 500mA. Above this load current,the quiescent current increases to 200A.
 
The AAT4650 is available in 8-pin SOP and TSSOP packages specified over -40 to 85.