General Description

The AAT4621 SmartSwitch 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.

Features

• VIN Range: 3.0V to 5.5V

• Dual Independent Current Limits

— 75mA 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 or 14-Pin TDFN33

Package

Applications

• Capacitor Charger

• CF Card Port Power Protection

• Express Card GSM/GPRS/3G Modems

• PC Card GSM/GPRS Class 10/12 Modems

• WiMAX Cards