Microchip Technology MA240029 データシート
2010-2011 Microchip Technology Inc.
DS39996F-page 31
PIC24FJ128GA310 FAMILY
2.4
Voltage Regulator Pin (V
CAP
)
A low-ESR (< 5Ω) capacitor is required on the V
CAP
pin
to stabilize the output voltage of the on-chip voltage
regulator . The V
regulator . The V
CAP
pin must not be connected to V
DD
and must use a capacitor of 10 µF connected to ground.
The type can be ceramic or tantalum. Suitable examples
of capacitors are shown in
The type can be ceramic or tantalum. Suitable examples
of capacitors are shown in
. Capacitors with
equivalent specification can be used.
The placement of this capacitor should be close to
V
The placement of this capacitor should be close to
V
CAP
. It is recommended that the trace length not
exceed 0.25 inch (6 mm). Refer to
for additional
information.
Designers may use
Designers may use
to evaluate ESR
for details on connecting and using the on-chip
regulator.
regulator.
FIGURE 2-3:
FREQUENCY vs. ESR
PERFORMANCE FOR
SUGGESTED V
PERFORMANCE FOR
SUGGESTED V
CAP
.
10
1
0.1
0.01
0.001
0.01
0.1
1
10
100
1000 10,000
Frequency (MHz)
ESR (
)
Note:
Typical data measurement at 25°C, 0V DC bias.
TABLE 2-1:
SUITABLE CAPACITOR EQUIVALENTS
Make
Part #
Nominal
Capacitance
Base Tolerance
Rated Voltage
Temp. Range
TDK
C3216X7R1C106K
10 µF
±10%
16V
-55 to 125ºC
TDK
C3216X5R1C106K
10 µF
±10%
16V
-55 to 85ºC
Panasonic
ECJ-3YX1C106K
10 µF
±10%
16V
-55 to 125ºC
Panasonic
ECJ-4YB1C106K
10 µF
±10%
16V
-55 to 85ºC
Murata
GRM32DR71C106KA01L
10 µF
±10%
16V
-55 to 125ºC
Murata
GRM31CR61C106KC31L
10 µF
±10%
16V
-55 to 85ºC