MPC5634M datasheet(77/106 Pages) FREESCALE

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MPC5634M Microcontroller Data Sheet, Rev. 8

Freescale Semiconductor

4.6.1

Regulator example

Figure 7. Core voltage regulator controller external components preferred configuration

4.6.2

Recommended power transistors

The following NPN transistors are recommended for use with the on-chip voltage regulator controller: ON SemiconductorTM

BCP68T1 or NJD2873 as well as Philips SemiconductorTM BCP68. The collector of the external transistor is preferably

connected to the same voltage supply source as the output stage of the regulator.

Table 16. Recommended operating characteristics

Symbol

Parameter

Value

Unit

hFE () DC current gain (Beta)

60 – 550

—

Absolute minimum power dissipation

>1.0

(1.5 preferred)

ICMaxDC Minimum peak collector current

1.0

VCESAT Collector-to-emitter saturation voltage

200–6001

1 Adjust resistor at bipolar transistor collector for 3.3 V/5.0 V to avoid VCE < VCE

SAT

VBE

Base-to-emitter voltage

0.4–1.0

MCU

Mandatory decoupling

capacitor network

VDDREG

VRCCTL

VDD

VSS

 6.8 F4  220 nF

680 nF



F

1.1–5.6



F

Resistor may or may not be

required. It depends on the

allowable power dissipation

of the npn bypass transistor

device.

Emitter and collector capacitors

(6.8

F and 10 F) should be

matched (same type) and ESR

should be lower than 200 m



Notes:

1. The VRCCTL capacitor is required.

2. The bypass transistor MUST be operated out of its saturation region.

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