82563EB datasheet(31/52 Pages) INTEL

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82563EB/82564EB Gigabit Platform LAN Connect Networking Silicon

4.4.4.6

PNP Transistor Specification for Internal LVR

4.4.4.7

Internal LVR Board Schematic

When using the internal voltage regulator controllers built into the 82563EB/82564EB, series

resistors may need to be placed in series with the collector in order to prevent the PNP transistors

from overheating. These series resistors dissipate a portion of the power that would otherwise be

dissipated by the PNP devices. The value and power rating of the resistors must be carefully chosen

to balance thermal limits against the PNP characteristics against total current draw. The regulator

must never drop below the minimum Vce and out of the linear region.

Output Voltage Tolerance

-10

+10

Output Capacitance

4.7

µF-

Output Capacitance ESRa

100

Ω

Current Consumption during power up

0.5

Current Consumption during power down

0.5

Peak to Peak output Rippleb

100

PSRR

Turn-On Time

0.1

External PNP hFE

100

a. The use of Tantalum capacitors is not recommended.

b. The peak to peak output ripple is measured at 20 MHz Bandwidth within the operational range.

Table 24. 1.2V Internal LVR Specification (Sheet 2 of 2)

Parameter

Value

Units

Comments

Minimum

Maximum

Table 25. PNP Specification

Title

Description

Min

Max

Units

Vce,sat

Collector-emitter saturation voltage

0.5

Ic(max)

Collector current, maximum sustained

1000

Base current, maximum sustained

Vbe

Base-emitter on voltage

Tjmax

Maximum junction temperature

150

°C

Power

Dissipation

Maximum total power dissipation

1.35

hFE

DC Current gain

100

Current Gain Product Bandwidth

MHz

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