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AAT4625IKS-T1 Datasheet(PDF) 10 Page - Advanced Analog Technology, Inc. |
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AAT4625IKS-T1 Datasheet(HTML) 10 Page - Advanced Analog Technology, Inc. |
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10 / 15 page  AAT4625 USB Single-Channel Power Switch 10 4625.2006.04.1.2 Reverse Voltage The AAT4625 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 reverse current may flow, potentially damaging the device. Under-Voltage Lockout The AAT4625 has been designed with an under-volt- age lockout control circuit. The under-voltage lock- out prevents the output MOSFET device from turn- ing on until VIN exceeds the typical UVLO threshold of 2.3V. During operation, the device will automati- cally shut down if VIN falls below the UVLO threshold and the fault flag will be toggled. Hot-Plug Applications Application circuit cards with a high inrush current potential can be limited by use of the AAT4625. The AAT4625 has both slew rate limited turn-on characteristics and a current limit controlled output which make it ideally suited for power port hot-plug applications. A host power back plane or hot-plug receptacle may be sensitive to short duration, high power surges. The AAT4625 will turn on in a linear ramping fashion and regulate the inrush current within the specified current limit for the device. The error flag usually will not be affected during appli- cation turn-on, since the 10ms flag blanking time is intended for these types of events. If an application turn-on current surge exceeds 10ms, an RC delay filter may be added to the flag output to prevent the system from receiving an error during the start-up sequence (see Figure 2). Figure 2: AAT4625 Inrush Current Protected Application. 0.1 μF AAT4625 1 2 3 45 6 7 8 EN FLG GND NC NC OUT IN OUT CBULK (120 μF) Card Application Circuit v+ GND Inrush Current Protected Application Card Cable / Connector to Hot-Plug Port VBUS GND Hot-Plug Receptacle PCB Layout Information In order to obtain maximum performance from the AAT4625, very careful consideration must be given to the printed circuit board layout. In most port power switch and port protection applications, high voltage and current transient events will occur. Proper PCB layout can help reduce the effects of transient events. PCB trace resistance will affect overall circuit transient response; in addition, small voltage drops will be incurred. |
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