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AAT4626 Datasheet(PDF) 6 Page - Advanced Analogic Technologies |
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AAT4626 Datasheet(HTML) 6 Page - Advanced Analogic Technologies |
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6 / 14 page  AAT4626 USB Dual-Channel Power Switch 6 4626.2002.1.0.93 Functional Block Diagram Over-Temp Protection Under- Voltage Lockout Under-Voltage Lockout Over-Temp Protection Current Limit Under-Voltage Lockout Over-Temp Protection Current Limit Current Limit 1.2V Reference EN A (EN A) IN OUT A OUT B EN B (EN B) FLG A FLG B Functional Description The AAT4626 is a dual integrated MOSFET load switch with a fixed level current limit, over temper- ature protection, level shifted inputs and a fault flag for each switch. The current limit control is com- bined with an over temperature thermal limit circuit to provide a comprehensive system to protect the load switch under short circuit or other adverse operating conditions. The AAT4626 is ideally suit- ed for control and protection of peripheral ports such as USB, RS232 and parallel ports. The current limit and over temperature circuits will act independently. The device current limit is acti- vated when the output load current exceeds a pre- set internal threshold level. The minimum current limit threshold characteristic is specified by ILIM(MIN). If the load switch ambient temperature becomes excessive or if a short circuit condition persists, the die temperature will rise causing the over tempera- ture protection circuit to activate. If the current limit or over temperature protection circuits are active for more then ten milliseconds, the system will be informed via the FAULT Flag. The ten millisecond fault blanking delay allows the AAT4626 to be turned on into large capacitive loads without activating the FAULT Flags. The open drain FAULT outputs can be connected directly to system controllers driven by voltage lev- els less than the IN pin voltage without additional level shifting circuitry. Each of the two load switches is turned on and off by applying a logic level signal to the EN(A/B) pin. The AAT4626 enable function is available in both active high and active low logic level versions. The AAT4626 typically consumes 20µA when operat- ing, when off, the device draws less then 1µA. In the off state, current is prevented from flowing between the input and output on each respective channel. The EN(A/B) function has logic level thresholds that allow the AAT4626 to be TTL com- patible and may also be controlled by 2.5V to 5.0V CMOS circuits. The voltage level on either EN(A/B) or FAULT(A/B) should not exceed the input supply level present on the IN pin. |
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