isl9211a Intersil Corporation, isl9211a Datasheet - Page 9

• Manufacturer Part Number: isl9211a
• Description: Charging System Safety Circuit
• Manufacturer: Intersil Corporation

ISL9211A
The over-shoot caused by a hot insertion is not very
dependent on the decoupling capacitance value. Especially
when ceramic type capacitors are used for decoupling. In
theory, the over-shoot can rise up to twice of the DC output
voltage of the AC adapter. The actual peak voltage is
dependent on the damping factor that is mainly determined
by the parasitic resistance (R in Figure 16).
In practice, the input decoupling capacitor is recommended
to use a 25V, X5R dielectric ceramic capacitor with a value
between 0.1µF to 1µF.
The output of the ISL9211A and the input of the charging
circuit typically share one decoupling capacitor. The
selection of that capacitor is mainly determined by the
requirement of the charging circuit. When using the ISL6292
family chargers, a 1µF, 6.3V, X5R capacitor is
recommended.
Layout Recommendation
The ISL9211A uses a thermal-enhanced TDFN package
with an exposed thermal pad at the bottom of the package.
The layout should include as much copper as possible
beneath the exposed pad on the component layer to improve
thermal performance. The exposed pad under the package
should be connected to the ground plane electrically as well
as thermally. The vias should be about 0.3mm to 0.33mm in
diameter, use as many vias as possible to fit in the epad
area.
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FN6702.0
April 2, 2009