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AAT4620 - PCMCIA Current Limit Interface and Capacitor Charger

General Description

The AAT4620 SmartSwitch is a current limited P-channel MOSFET power switch designed for high-side loadswitching 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.

Key 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.
  • 65m Typical RDS(ON) at 3V.
  • Only 1.4V Needed for Enable Control Pin.
  • System READY Output with Externally Programmable Hysteresis.
  • Under-Voltage Lockout.

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DATA SHEET AAT4620 PCMCIA Current Limit Interface and Capacitor Charger General Description The AAT4620 SmartSwitch is a current limited P-channel MOSFET power switch designed for high-side loadswitching 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. The current limit is set by two external resistors allowing a ±10% current limit accuracy over the normal operating temperature range.