SPC564L54L5 datasheet(105/160 Pages) STMICROELECTRONICS

105 / 160 page

SPC56XL60/54

Electrical characteristics

Doc ID 15457 Rev 8

105/160

The following bipolar transistors are supported:

●

BCP68 from ON Semiconductor

●

BCX68 from Infineon

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.

Table 18.

Recommended operating characteristics

Symbol

Parameter

Value

Unit

hFE( )

DC current gain (Beta)

85 - 375

—

Maximum power dissipation @

TA=25°C

(1)

derating factor 12mW/degC

1.5

ICMaxDC

Maximum peak collector current

1.0

VCESAT

Collector-to-emitter saturation

voltage(Max)

600(2)

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

VBE

Base-to-emitter voltage (Max)

1.0

Table 19.

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.

—

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

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