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MIC2526 Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC2526 Datasheet(HTML) 9 Page - Micrel Semiconductor |
9 / 12 page February 2000 9 MIC2526 MIC2526 Micrel Applications Information Supply Filtering A 0.1 µF to 1µF bypass capacitor from IN to GND, located at the device, is strongly recommended to control supply tran- sients. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead induc- tance) to damage internal control circuitry. Input or output transients must not exceed the absolute maximum supply voltage (V IN max = 6V) even for a short duration. MIC2526 ENA OUTA FLGA FLGB GND ENB OUTB IN 0.1µF to 1µF 3.0V to 5.5V Figure 1. Supply Bypassing Enable Input EN must be driven logic high or logic low for a clearly defined input. Floating the input may cause unpredictable operation. EN should not be allowed to go negative with respect to GND. Soft Start The MIC2526 presents a high impedance when off, and slowly becomes a low impedance as it turns on. This reduces inrush current and related voltage drop that results from charging a capacitive load, satisfying the USB voltage droop requirements for bus-powered applications as shown in Figure 2. The soft start circuit shown in Figure 3 can be utilized to meet USB transient regulation specifications with large load ca- pacitances (C BULK > 10uF). The MIC2526 will provide inrush current limiting for these applications. Transient Overcurrent Filter When the MIC2526 is enabled, large values of capacitance at the output of the device will cause inrush current to exceed the short circuit current-limit threshold of the device and assert the flag. The duration of this time will depend on the size of the output capacitance. Refer to the “Functional Characteristics” turn-on and turnoff behaviors for details. During the capacitance charging time, the device enters into constant-current mode. As the capacitance is charged, the current decreases below the short circuit current-limit thresh- old, and the flag will then be deasserted. MIC2526-xBM ENA OUTA FLGA FLGB GND OUTB IN 18 27 36 5 0.1µF Capacitive Load USB Controller ENB 4 Bus Powered Hub Downstream USB Device Cable Cable USB Host VBUS GND 4.7 µF CBULK Figure 2. Soft Start (Single Channel) MIC2526-2BM ENA OUTA FLGA FLGB GND OUTB IN 18 27 36 5 USB Controller ENB 4 USB Peripheral Cable USB Hub CBULK GND VBUS 4.7 µF USB Function USB Function CBULK Figure 3. Inrush Current-Limit Application |
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