MPC5634M datasheet(69/118 Pages) FREESCALE

69 / 118 page

Electrical characteristics

MPC5634M Microcontroller Data Sheet, Rev. 4

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

3.6.1

Regulator example

Figure 7. Core Voltage Regulator Controller External Components Preferred Configuration

3.6.2

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 (β)

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

> 2001

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

SAT

VBE

Base-to-emitter voltage

>0.7

MCU

The resistor may or may

not be required.

This depends on the

allowable power dissipation of

the npn bypass transistor

device.

The bypass transistor

MUST be operated out

of saturation region.

Mandatory decoupling capacitor

network

VDDREG

VRCCTL

VDD

VSS

VRCCTL capacitor is required

MPC5634M Datasheet(PDF) 69 Page - Freescale Semiconductor, Inc

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