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LM3526M-L Datasheet(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
No. de pieza LM3526M-L
Descripción Electrónicos  Dual Port USB Power Switch and Over-Current Protection
Download  11 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3526M-L Datasheet(HTML) 9 Page - National Semiconductor (TI)

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Application Information (Continued)
PCB LAYOUT CONSIDERATIONS
In order to meet the USB requirements for voltage drop,
droop and EMI, each component used in this circuit must be
evaluated for its contribution to the circuit performance. The
PCB layout rules and guidelines must be followed.
Place the switch as close to the USB connector as pos-
sible. Keep all V
bus traces as short as possible and use at
least 50-mil, 1 ounce copper for all V
bus traces. Solder
plating the traces will reduce the trace resistance.
Avoid vias as much as possible. If vias are used, use mul-
tiple vias in parallel and/or make them as large as pos-
sible.
Place the output capacitor and ferrite beads as close to
the USB connector as possible.
If ferrite beads are used, use wires with minimum resis-
tance and large solder pads to minimize connection re-
sistance.
DS101097-23
FIGURE 2. Self-Powered Hub Per-Port Voltage Drop
www.national.com
9


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