Datasheet

 2012-2013 Microchip Technology Inc. DS30009312B-page 35
PIC24FJ128GC010 FAMILY
2.4 Voltage Regulator Pin (VCAP)
A low-ESR (< 5Ω) capacitor is required on the VCAP pin
to stabilize the output voltage of the on-chip voltage
regulator. The V
CAP pin must not be connected to VDD
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 Table 2-1. Capacitors with
equivalent specification can be used.
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 Section 37.0 “Electrical
Characteristics” for additional information.
Designers may use Figure 2-3 to evaluate ESR
equivalence of candidate devices.
Refer to Section 34.2 “On-Chip Voltage Regulator”
for details on connecting and using the on-chip
regulator.
FIGURE 2-3: FREQUENCY vs. ESR
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