PIC18F44J50-I Datasheet, PDF (31/562 Pages) Microchip Technology – 28/44-Pin, Low-Power, High-Performance USB Microcontrollers

PIC18F46J50 FAMILY
2.4 Voltage Regulator Pins
(VCAP/VDDCORE)
On “F” devices, a low-ESR (< 5Ω) 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 or any other voltage source on
an “F” device. The VCAP/VDDCORE pin should only be
connected to a 10 µF capacitor to ground. The type can
be ceramic or tantalum. Suitable example capacitors
are provided in Table 2-1.
Designers may use Figure 2-3 to evaluate ESR
equivalence of candidate devices. It is recommended
that the trace length not exceed 0.25 inch (6 mm).
Refer to Section 30.0 “Electrical Characteristics” for
additional information.
On “LF” devices, the internal core voltage regulator is
disabled. On these devices, the VCAP/VDDCORE pin
must be externally connected to a suitable VDDCORE
level voltage source at the circuit board level. Refer to
Section 30.0 “Electrical Characteristics” for the
allowed VDDCORE voltage range. Good power supply
bypassing practices should be used for the supply
source providing the VCAP/VDDCORE voltage.
It is recommended to use a 0.1 µF ceramic capacitor
between VCAP/VDDCORE and ground, placed as close
to the VCAP/VDDCORE and VSS pins as possible.
FIGURE 2-3:
10
FREQUENCY vs. ESR
PERFORMANCE FOR
SUGGESTED VCAP
1
0.1
0.01
0.001
0.01
0.1
1
10
100
Frequency (MHz)
1000 10,000
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
TDK
Panasonic
Panasonic
Murata
Murata
C3216X7R1C106K
C3216X5R1C106K
ECJ-3YX1C106K
ECJ-4YB1C106K
GRM32DR71C106KA01L
GRM31CR61C106KC31L
10 µF
10 µF
10 µF
10 µF
10 µF
10 µF
±10%
±10%
±10%
±10%
±10%
±10%
16V
-55 to +125ºC
16V
-55 to +85ºC
16V
-55 to +125ºC
16V
-55 to +85ºC
16V
-55 to +125ºC
16V
-55 to +85ºC
 2011 Microchip Technology Inc.
DS39931D-page 31