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US2076B Datasheet(PDF) 6 Page - Unisonic Technologies

Part No. US2076B
Description  DUAL USB HIGH-SIDE POWER SWITCHDUAL USB HIGH-SIDE POWER SWITCH
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
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US2076B Datasheet(HTML) 6 Page - Unisonic Technologies

   
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US2076B
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
6 of 8
www.unisonic.com.tw
QW-R502-447.a
APPLICATIONS INFORMATION
Supply filtering
In order to control supply transients, a bypass capacitor is located nearly between IN to GND. 0.1µF ~ 1µF is
suitable (See Figure 1). Without a bypass capacitor, an output short may cause sufficient ringing on the input (from
supply lead inductance) to damage internal control circuitry.
Input transients must not exceed the absolute maximum supply voltage (VIN max = 6V) even for a short duration.
Enable Input
For a clearly defined input, the EN pin must be driven logic high or logic low. Floating the input may cause
unpredictable operation. EN should not be allowed to go negative with respect to GND.
Soft Start
The UTC US2076B is 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 drop requirements, for bus-powered applications as shown in Figure 2.
Capactive
Load
Downstream USB Device
Cable
CBULK
BUS Powered Hub
USB
Controller
ENA
ENB
FLGA
FLGB
OUTA
OUTB
GND
IN
8
7
6
5
1
2
3
4
4.7
µF
Cable
GND
VBUS
USB Host
Figure 2. Soft Start (Single Channel)
UTC
US2076B


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