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AAT4650IAS-T1 Datasheet(PDF) 8 Page - Advanced Analogic Technologies |
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AAT4650IAS-T1 Datasheet(HTML) 8 Page - Advanced Analogic Technologies |
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8 / 14 page  Applications Information Input Capacitor A 1µF or larger capacitor is typically recommended for CIN. A CIN capacitor is not required for basic operation; however, it is useful in preventing load transients from affecting up-stream circuits. CIN should be located as close to the device VIN pin as practically possible. Ceramic, tantalum, or alu- minum electrolytic capacitors may be selected for CIN. There is no specific capacitor equivalent series resistance (ESR) requirement for CIN. However, for higher current operation, ceramic capacitors are rec- ommended for CIN due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batter- ies in portable devices. Output Capacitor A 0.1µF or greater capacitor is generally required between VCC and GND. Likewise, with the output capacitor, there is no specific capacitor ESR requirement. If desired, COUT may be increased to accommodate any load transient condition. Parallel Interface / Break Before Make A 2-bit parallel interface determines the state of the VCC output. The logic levels are compatible with CMOS or TTL logic. A logic low value must be less than 0.8V, and a logic high value must be greater than 2.4V. In cases where the interface pins rapidly change state directly from 3V to 5V (or vice versa), internal break-before-make circuitry prevents any back flow of current from one input power supply to the other. In addition, the body connections of the internal P-channel MOSFET switches are always set to the highest potential of VCC3, VCC5, or VCC, which prevents any body diode conduction, power supply backflow, or possible device damage. FAULT Output The FAULT output is pulled to ground by an open drain N-channel MOSFET during an over-current or output slew condition. It should be pulled up to the reference power supply of the controller IC via a nominal 100k Ω resistor. Voltage Regulation The PC card specification calls for a regulated 5V supply tolerance of ±5%. Of this, a typical power supply will drop less than 2% and the PCB traces will drop another 1%. This leaves 2% for the AAT4650 as the PC card switch. In the PC card application, the maximum allowable current for the AAT4650 is dominated by voltage regulation, rather than by thermal considerations, and is set by either the current limit or the maximum RDS(ON) of the P- channel MOSFET. The maximum RDS(ON) at 85°C is calculated by applying the RDS temperature coef- ficient to the maximum room temperature RDS(ON): -or- The maximum current is equal to the 2% tolerance of the 5V supply (100mV) across the AAT4650 divided by RDS(ON)(MAX). Or: For the 3.3V supply in the PC card application, the conditions are a bit relaxed, with the allowable volt- age regulation drop equal to 300mV. With a 2% supply and 1% PCB trace regulation, the PC card switch can have a 200mV drop. So: Since 1.5A is the nominal current limit value, the AAT4650 will current limit before IMAX3 is reached. I MAX3 = = 1.5A 200mV 134m Ω I MAX5 = = 856.2mA 100mV 116.8m Ω R DS(ON)(MAX) = 100m Ω ⋅ (1 + [0.0028 ⋅ 60]) = 116.8mΩ R DS(ON)(MAX) = RDS(ON)25 ⋅ (1 + [TC ⋅ ΔT]) AAT4650 5V/3V PC Card Power Switch 8 4650.2006.05.1.2 |
Similar Part No. - AAT4650IAS-T1 |
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Similar Description - AAT4650IAS-T1 |
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