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MIC2526-1BM

Dual USB Power Control Switch

Micrel 

MIC2526

In USB applications, it is required that output bulk capaci-

tance is utilized to support hot-plug events. When the MIC2526

is enabled, the flag may go active for about 1ms due to inrush

current exceeding the current-limit setpoint. Additionally,

during hot-plug events, inrush currents may also cause the

flag to go active for 30µs. Since these conditions are not valid

overcurrent faults, the USB controller must ignore the flag

during these events. To prevent this erroneous overcurrent

reporting, a 1ms RC filter as shown in Figure 4 may be used.

Alternatively, a 1ms debounce routine may be programmed

into the USB logic controller, eliminating the need for the RC

filter.

USB Controller

OVERCURRENT

V+

10k

10k

0.1

µF

MIC2526

1 ENA OUTA 8

2 FLGA

IN 7

3 FLGB GND 6

4 ENB OUTB 5

Figure 4. Transient Filter

Micrel

MIC2526

10

February 2000

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