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sense resistor, is 67.2mm (7.47mm x 8.99mm) .
Output Capacitor and Return Trace
The output capacitor serves the same purpose as the input
capacitor, but also maintains a stable output voltage. As
explained above, the current travels to the load and back to
the C OUT GND terminal. C OUT should be placed close to the
VOUT pin. The traces of C OUT to L1, VOUT, and return from
load to C OUT should be as short and wide as possible to
minimize trace resistance and inductance. To minimize noise
coupling to load, a small-value capacitor can be placed
between VOUT and C OUT to route high-frequency noise back
to GND before it gets to the load.
Inductor
Inductor (L1) should be placed as close to the regulator as
possible to minimize trace resistance and inductance for the
reasons explained above.
Table 1. Recommended External Components
Part Number
Inductor (L)
LQH43MN100K03
Sense Resistor
The sense resistor provides a feedback signal for the
regulator to control output voltage. A long trace from the
sense resistor to the FB pin couples noise into the FB pin. If
noise is coupled into the FB pin, it causes unstable operation
of the switching regulator, which affects application
performance. The return trace from the sense resistor to the
FB pin should be short and away from any fast-switching
signal traces. The ground plane under the return trace is
necessary. If the ground plan under the return trace is noisy,
but not the same ground plane as the regulator; the noise
could be coupled into the FB pin through PCB parasitic
capacitance, yielding noisy output.
In Figure 30; C IN , C OUT , and L1 are all placed next to the
regulator. All traces are on the same layer to minimize trace
resistance and inductance. Total PCB area, not including the
2
Manufacturer
Murata
10.0μH
Minimum C OUT
1.0μF
Minimum C IN
10.0μF
Schottky Diode
N/A
N/A
NLCV32T-100K-PFR
VLF3010AT-100MR49-1
DEM2810C 1224-AS-H-100M
CV105X5R105K25AT
GRM21BR71A106KE51L
RBS520S30
RB520S-30
TDK
TDK
TOKO
AVX/Kyocera
Murata
Fairchild Semiconductor
Rohm
? 2011 Fairchild Semiconductor Corporation
FAN5345 ? Rev. 1.0.0
12
www.fairchildsemi.com
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