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UZXYY Folha de dados(PDF) 9 Page - Advanced Analogic Technologies |
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UZXYY Folha de dados(HTML) 9 Page - Advanced Analogic Technologies |
9 / 15 page AAT4620 PCMCIA Current Limit Interface and Capacitor Charger 4620.2007.04.1.1 9 Functional Block Diagram GND EN IL EN IU ISETU VCC OUT ISETL RDY RHYS Reverse Blocking Over-Temp Protection Power Loop Under- Voltage Lockout 1.2V Reference Current Limit Control Functional Description The AAT4620 is an integrated P-channel MOSFET load switch with an upper and lower adjustable cur- rent limits which can be enabled independently, over temperature protection, a power loop and a super capacitor charger. The current limit control is combined with an over temperature thermal limit and power loop circuit to provide a comprehensive system to protect the load switch and its supply from load conditions which exceed the supply spec- ifications. The AAT4620 has been designed specif- ically to provide the interface between a PCMCIA host and PCMCIA card where a super capacitor has been used to "average out" high pulse currents which would otherwise exceed the PCMCIA/ Express Card power specifications. e.g. GSM/ GPRS modem cards, where pulse currents during transmit signals can exceed the 1A maximum spec- ification (1.3A in the case of Express Card). The current limit and over temperature circuits act independently. The device current limit is activated when the output load current exceeds an internal threshold level. There are two internal current lim- its which are enabled independently. The current limit threshold in each case is determined by exter- |
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