FAN5361 Fairchild Semiconductor, FAN5361 Datasheet - Page 15

• Manufacturer Part Number: FAN5361
• Description: The FAN5361 is a 600mA or 750mA, step-down, switching voltage regulator that delivers a fixed output from an input voltage supply of 2
• Manufacturer: Fairchild Semiconductor

PCB Layout Guidelines
There are only three external components: the inductor and
the input and output capacitors. For any buck switcher IC,
including the FAN5361, it is important to place a low-ESR
input capacitor very close to the IC, as shown in Figure 41.
The input capacitor ensures good input decoupling, which
helps reduce noise appearing at the output terminals and
ensures that the control sections of the IC do not behave
© 2008 Fairchild Semiconductor Corporation
FAN5361 • Rev. 1.1.2
V
OUT
470nH
Figure 41. PCB Layout Guidance
A1
B1
C1
15
erratically due to excessive noise. This reduces switching
cycle jitter and ensures good overall performance. It is
important to place the common GND of C
as possible to the FAN5361 C2 terminal. There is some
flexibility in moving the inductor further away from the IC; in
that case, V
C
A2
B2
C2
OUT
OUT
C
should be considered at the C
V
IN
IN
GND
IN
and C
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OUT
terminal.
OUT
as close