PIC24FJ128GA310 datasheet(31/406 Pages) MICROCHIP

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 2010-2011 Microchip Technology Inc.

DS39996F-page 31

PIC24FJ128GA310 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 VCAP 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

VCAP. It is recommended that the trace length not

exceed 0.25 inch (6 mm). Refer to Section 32.0

“Electrical

Characteristics”

for

additional

information.

Designers may use Figure 2-3 to evaluate ESR

equivalence of candidate devices.

Refer to Section 29.2 “On-Chip Voltage Regulator”

for details on connecting and using the on-chip

regulator.

FIGURE 2-3:

FREQUENCY vs. ESR

PERFORMANCE FOR

SUGGESTED VCAP

0.1

0.01

0.001

0.01

0.1

100

1000 10,000

Frequency (MHz)

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

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