Datasheet

 2013 Microchip Technology Inc. DS30003030B-page 31
PIC24FV16KM204 FAMILY
2.4 Voltage Regulator Pin (VCAP)
Some of the PIC24FV16KM devices have an internal
voltage regulator. These devices have the voltage
regulator output brought out on the VCAP pin. On the
PIC24F K devices with regulators, a low-ESR (< 5Ω)
capacitor is required on the VCAP pin to stabilize the
voltage regulator output. 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
Table 2-1. Capacitors with equivalent specifications can
be used.
Designers may use Figure 2-3 to evaluate ESR
equivalence of candidate devices.
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 27.0 “Electrical
Characteristics” for additional information.
Refer to Section 27.0 “Electrical Characteristics” for
information on V
DD and VDDCORE.
FIGURE 2-3: FREQUENCY vs. ESR
PERFORMANCE FOR
SUGGESTED V
CAP
Note: This section applies only to
PIC24FV16KM devices with an on-chip
voltage regulator.
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