MPC5643L datasheet(84/136 Pages) FREESCALE

84 / 136 page

MPC5643L Microcontroller Data Sheet, Rev. 8.1

Electrical characteristics

Freescale Semiconductor

The recommended external ballast transistor is the bipolar transistor BCP68 with the gain range of 85 up to 375 (for IC=500mA,

VCE=1V) provided by several suppliers. This includes the gain variations BCP68-10, BCP68-16 and BCP68-25.The most

important parameters for the interoperability with the integrated voltage regulator are the DC current gain (hFE) and the

temperature coefficient of the gain (XTB). While the specified gain range of most BCP68 vendors is the same, there are slight

variations in the temperature coefficient parameter. MPC5643LVoltage regulator operation was simulated against the typical

variation on temperature coefficient and against the specified gain range to have a robust design.

1 derating factor 12mW/degC

2 Adjust resistor at bipolar transistor collector for 3.3V to avoid VCE<VCE

SAT

Table 18. Voltage regulator electrical specifications

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Cext External decoupling/

stability capacitor

Min, max values shall be

granted with respect to

tolerance, voltage,

temperature, and aging

variations.

—40

µF

Combined ESR of

external capacitor

—0.01

—0.10



Number of pins for

external decoupling/

stability capacitor

—5

——

—

CV1V2

Total capacitance on

1.2 V pins

Ceramic capacitors,

taking into account

tolerance, aging, voltage

and temperature variation

300

—

900

tSU

Start-up time after main

supply stabilization

Cload =10µF×4

—

—2.5

—

Main High Voltage Power -

Low Voltage Detection,

upper threshold

——

—2.9

—

Main supply low voltage

detector, lower threshold

—2.6

——

—

Digital supply high voltage

detector upper threshold

Before a destructive reset

initialization phase

completion

1.355

—

1.495

After a destructive reset

initialization phase

completion

1.39

—1.47

—

Digital supply high voltage

detector lower threshold

Before a destructive reset

initialization phase

completion

1.315

—

1.455

After a destructive reset

initialization phase

completion

1.35

—1.38

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