APL3225 데이터 시트보기 (PDF) - Anpec Electronics
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APL3225 Datasheet PDF : 15 Pages
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APL3225
Application Information
Capacitor Selection
The input capacitor is for decoupling and prevents the
input voltage from overshooting to dangerous levels. In
the AC adapter hot plug-in applications or load current
step-down transient, the input voltage has a transient
spike due to the parasitic inductance of the input cable. A
25V, X5R, dielectric ceramic capacitor with a value be-
tween 1µF and 4.7µF placed close to the ACIN pin is
recommended.
The output capacitor of CHR_LDO is for CHR_LDO volt-
age decoupling. And also can be as the input capacitor of
the charging circuit. At least, a 1µF, 10V, X5R capacitor is
recommended.
Recommended Minimum Footprint
Thermal Via diameter
12mil X 5
0.572mm
0.241mm
Ground plane for
Thermal PAD
0.508mm
0.8mm
TDFN2x2-8
0.222mm
Layout Consideration
In some failure modes, a high voltage may be applied to
the device. Make sure the clearance constraint of the PCB
layout must satisfy the design rule for high voltage. The
exposed pad of the TDFN2x2-8 and DFN3x3-8 performs
the function of channeling heat away. It is recommended
that connect the exposed pad to a large copper ground
plane on the backside of the circuit board through sev-
eral thermal vias to improve heat dissipation. The input
and output capacitors should be placed close to the IC.
The high current traces like input trace and output trace
must be wide and short.
Thermal Via diameter
12mil X 5
0.61mm
0.305mm
Ground plane for
Thermal PAD
0.305mm
0.66mm
1.575mm
DFN3X3-8
Copyright © ANPEC Electronics Corp.
8
Rev. A.1 - Nov., 2012
www.anpec.com.tw
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