AAT4621

DATA SHEET AAT4621 PC Card Current Limit Interface and Capacitor Charger General Description The AAT4621 SmartSwitch family is a current limited P-channel MOSFET power switch designed for high-side load-switching applications in PC Card GSM/GPRS/3G modem cards. Used in conjunction with a super capacitor, the AAT4621 will ensure that the power ratings of the PCMCIA host are not exceeded at any time. Featuring two independent, programmable current limits and a power loop, the AAT4621 can ensure that the super capacitor can be charged without exceeding PCMCIA specifications. The current limit is set by two external resistors allowing a ±10% current limit accuracy over the normal operating temperature range. The switch can be controlled from either of the two enable inputs and in the off condition will block currents in both directions. The AAT4621 also incorporates a System READY function which can advise the system that the super capacitor is fully charged and ready for use. Adjustable hysteresis is provided with the addition of an external resistor. The quiescent supply current is typically a low 40μA. In shutdown mode, the supply current decreases to less than 1μA. The AAT4621 has a current limit range from 75mA to 1200mA; the AAT4621-1 has a current limit range from 150mA to 2400mA. The AAT4621 is available in a thermally enhanced, Pb-free 14-pin TDFN33 package and is specified over the -40°C to 85°C temperature range. Features Operating Voltage Range: 3.0V to 5.5V Dua...