SPC5644AF0MLU2 datasheet(76/138 Pages) FREESCALE

76 / 138 page

MPC5644A Microcontroller Data Sheet, Rev. 7

Freescale Semiconductor

3.6.2

Regulator Example

In designs where the MPC5644A microcontroller’s internal regulators are used, a ballast is required for generation of the 1.2 V

internal supply. No ballast is required when an external 1.2 V supply is used.

Figure 8. Core voltage regulator controller external components preferred configuration

2 BETA represents the worst-case external transistor. It is measured on a per-part basis and calculated as

(IDD  IVRCCTL).

3 Refer to Table 52 for the maximum operating frequency.

4 Values are based on IDD from high-use applications as explained in the IDD Electrical Specification.

Table 17. MPC5644A External network specification

External Network

Parameter

Min

Typ

Max

Comment

NJD2873 or BCP68

only

1.1

F2.2F2.97F

X7R,-50%/+35%

3*2.35

F+5F3*4.7F+10F3*6.35F+13.5F

X7R, -50%/+35%

Equivalent ESR of

Ce capacitors

50m

4*50nF

4*100nF

4*135nF

X7R, -50%/+35%

+/-10%

MCU

The bypass transistor

MUST be operated out

of saturation region.

Mandatory decoupling

capacitor network

VDDREG

VRCCTL

VDD

VSS

VRCCTL capacitor and resistor is required

Creg

The resistor may or may not be

required. This depends on the

allowable power dissipation of

the npn bypass transistor

device. The resistor may be

used to limit the in-rush current

at power on.

Keep parasitic inductance

under 20nH



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