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IMP2525A-2BNIMP2526-1BM Datasheet(PDF) 11 Page - A1 PROs co., Ltd. |
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IMP2525A-2BNIMP2526-1BM Datasheet(HTML) 11 Page - A1 PROs co., Ltd. |
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11 / 32 page  IMP2525 IMP2525 © 2000 IMP, Inc. USB High-Side Power Switches 5 Application Information Supply Filtering IMP strongly recommends the use of a 0.1 µF to 1µF bypass capac- itor to control transients on the power supply pin. This capacitor, connected from IN to GND, should be in close proximity to the IMP2525 for maximum transient suppression. The lack of suitable bypassing can result in ringing on the IN input when transients occur. This ringing, due to supply lead inductance, could damage IMP2525 control circuitry if the 8V maximum input rating is exceeded. Figure 1. Supply Bypassing 2525_04.eps 4.0V to 5.5V 0.1 µF to 1µF IN GND IMP2525 3 7 Enable Input As with any logic input, the enable pin, EN, must be driven to a definitive logic state at all times. Floating the input can result in spurious operation. Do not drive EN below GND. Fault Flag Output Soft Start The IMP2525 provides a “Soft-Start” function that ramps up the ON-current to eliminate any excessive voltage drop that could occur due to charging a capacitive load in bus-powered applica- tions. The "Soft-Start" results from a switch ON resistance, RON, that is ramped down from a high impedance to 0.14 Ω in millisec- onds. This RON ramping reduces the inrush current and related transients occur when charging capacitive loads; a requirement for meeting the USB voltage drop standards for bus-powered applications (see Figure 2). In circuits with large load capacitances, CBULK, exceeding 10 µF, the soft-start circuit shown in Figure 3 can be used to limit the inrush start-up current to USB transient spec- ifications. The current limiting feature of the IMP2525 provides this high-load, soft-start operation. 2525_06.eps EN VBUS GND Cable Bus Powered Hub Cable Downstream USB Device USB Host 1 0.1 µF Capacitive Load CBULK 4.7 µF OUT FLG 2 IN GND IMP2525-xBM USB Controller 3 OUT NC 4 8 7 6 5 NC Figure 2. Soft-Start Application |
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