
2011 Microchip Technology Inc.
DS39932D-page 33
PIC18F46J11 FAMILY
2.4
Voltage Regulator Pins (VCAP/
VDDCORE)
When the regulator is enabled (“F” devices), a low-ESR
(< 5) capacitor is required on the VCAP/VDDCORE pin to
stabilize the voltage regulator output voltage. The VCAP/
VDDCORE pin must not be connected to VDD and must
use a capacitor of 10 F connected to ground. The type
can be ceramic or tantalum. Suitable examples of
capacitors are shown in
Table 2-1. Capacitors with
equivalent specifications can be used.
equivalence of candidate devices.
It is recommended that the trace length not exceed
0.25 inch (6 mm). Refer to Section 28.0 “Electrical
Characteristics”
for additional information.
When the regulator is disabled (“LF” devices), the
VCAP/VDDCORE pin must be tied to a voltage supply at
the VDDCORE level. Refer to Section 28.0 “Electrical
Characteristics”
for information
on VDD
and
VDDCORE.
Note that the “LF” versions are provided with the
voltage regulator permanently disabled; they must
always be provided with a supply voltage on the
VDDCORE pin.
FIGURE 2-3:
FREQUENCY vs. ESR
PERFORMANCE FOR
SUGGESTED VCAP
.
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 F
±10%
16V
-55 to 125C
TDK
C3216X5R1C106K
10 F
±10%
16V
-55 to 85C
Panasonic
ECJ-3YX1C106K
10 F
±10%
16V
-55 to 125C
Panasonic
ECJ-4YB1C106K
10 F
±10%
16V
-55 to 85C
Murata
GRM32DR71C106KA01L
10 F
±10%
16V
-55 to 125C
Murata
GRM31CR61C106KC31L
10 F
±10%
16V
-55 to 85C