 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
AAT4626IHS-1-B1 Datasheet(PDF) 8 Page - Advanced Analogic Technologies |
|
||||||||||||||||||||||||||||||
AAT4626IHS-1-B1 Datasheet(HTML) 8 Page - Advanced Analogic Technologies |
|
|
8 / 14 page  recovers. Since this cycle would be self-perpetuat- ing, the entire circuit could be seen to be unstable. In the very rare case where capacitor cost is prohibitive and the input capacitor is omitted, the output load cir- cuit should be slew rate limited when turned on. Output Capacitor In order to insure stability while the device current limit is active, a small capacitance of approximately 1µF should be used on each output. When either output of the AAT4626 is activated using the EN(A/B) function, there are no momentary current transients as in the case of when a short circuit sud- denly applied to a device that is already on. Refer to the characteristic curve named "Turn-On/OFF Response". Regardless of output capacitor size, output current on either output is limited to the value allowed by the threshold determined by the internal current limiting circuitry. Refer to the internal current limit threshold specifications stated in the electrical characteristics section of this datasheet. This per- mits very large output capacitors to be used. For example, USB ports are specified to have at least 120µF of down stream capacitance from their controlling power switch. An output capacitance as large as 1000µF would not disturb the input power supply to an AAT4626 used to control a USB port. EN Inputs The AAT4626 has two enable inputs, ENA and ENB. These two enable inputs allow the AAT4626 to independently control each respective output. The device is available in both active high EN enable and active low (EN) enable versions. For specific part numbers, refer to the ordering infor- mation section. When both the A and B outputs of the AAT4626 are in the off state, the respective out- puts are an open circuit and the device quiescent current consumption is reduced to less than 1µA. The ENA and ENB threshold voltages are set to allow the AAT4626 to be controlled by 5 volt TTL levels as well as CMOS compatible levels ranging from 2.5 volts to 5 volts. The ENA or ENB function control voltage levels should not exceed the input supply level applied to the IN pin. Fault Flag Output The AAT4626 features an active low fault flag (FLGA and FLGB) output for each A and B output channel. The fault flags are provided to alert the system if the over current or over temperature cir- cuits become active or if the load switch is not receiving a sufficient voltage level to operate prop- erly. If either the current limit or over temperature circuits in any combination are constantly active for more than approximately ten milliseconds, the FLG(A/B) pin is pulled to ground internally through an open drain device. The 10 millisecond delay on the fault function is intended to prevent capacitive loads connected to one of the load switch outputs from activating it's respective flag when the device is turned on. The placement of a pull up resistor between the FLGA or FLGB pin and the IN pin is recommended. Reasonable values for the pull up resistor should range from 10k Ω to 100kΩ. Since the fault flags are open drain terminals, they may be pulled up to any voltage that is not greater than the level present on the IN pin. This is done to allow the AAT4625 to signal ancillary circuitry that is powered by voltage levels less than the level on the IN pin. If a fault flag delay greater then 10ms is required, addition delay may be added by use of an RC filter. Referencing to Figure 1, an RC filter can be added to the fault flag output. Reverse Voltage The AAT4626 is designed to control current flowing from IN to OUT. If a voltage is applied to OUT which is greater than that on IN, a large resulting reverse current may flow, potentially damaging the AAT4626. Under Voltage Lockout The AAT4626 has been designed with an under voltage lockout (UVLO) control circuit. The under voltage lockout prevents the output MOSFET devices from turning on until VIN exceeds the typi- cal UVLO threshold of 2.3 volts. During operation, the device will automatically shutdown if VIN falls below the UVLO threshold and the fault flags will be toggled. AAT4626 USB Dual-Channel Power Switch 8 4626.2002.1.0.93 |
Similar Part No. - AAT4626IHS-1-B1 |
|
Similar Description - AAT4626IHS-1-B1 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
