General Description

The AAT4620 SmartSwitch is a current limited P-channel MOSFET power switch designed for high-side load-switching applications in PCMCIA GSM/GPRS/3G modem cards. Used in conjunction with a super capacitor, the AAT4620 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 AAT4620 can ensure that the super capacitor can be charged without exceeding PCMCIA specifications.

特性 Features

? VIN Range: 3.0V to 5.5V

? Dual Independent Current Limits

— 100mA to 1200mA

— ±10 Current Accuracy

— 20°C Temperature Band

? Reverse Current Blocking Protection

? Power Loop

? Low Quiescent Current

— 40μA Typical

— 1.0μA Max with Switch Off

? 65mΩ Typical RDS(ON) at 3V

? Only 1.4V Needed for Enable Control Pin

? System READY Output with Externally

Programmable Hysteresis

? Under-Voltage Lockout

? Temperature Range: -40 to 85°C

? 12-Pin TSOPJW Package

Applications

? CF Card Port Power Protection

? Express Card GSM/GPRS/3G Modems

? Hot Swap Supplies

? PCMCIA Card GSM/GPRS/3G Modems

? Personal Communication Devices