82563EB Datasheet, PDF (31/52 Pages) Intel Corporation – Intel® 82563EB/82564EB Gigabit Ethernet Controllers

82563EB/82564EB Gigabit Platform LAN Connect Networking Silicon
Table 24. 1.2V Internal LVR Specification (Sheet 2 of 2)
Parameter
Output Voltage Tolerance
Value
Minimum Maximum
-10
+10
Output Capacitance
4.7
-
Output Capacitance ESR^a
-
100
Current Consumption during power up
-
0.5
Units
%
µF
MΩ
mA
Current Consumption during power down
-
0.5
mA
Peak to Peak output Ripple^b
PSRR
Turn-On Time
-
100
mV
-
20
dB
0.1
1
ms
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.
4.4.4.6
PNP Transistor Specification for Internal LVR
Comments
-
-
-
-
-
-
-
-
-
Table 25. PNP Specification
Title
V_ce,sat
I_c(max)
I_b
V_be
T_jmax
Power
Dissipation
hFE
fT
Description
Collector-emitter saturation voltage
Collector current, maximum sustained
Base current, maximum sustained
Base-emitter on voltage
Maximum junction temperature
Maximum total power dissipation
DC Current gain
Current Gain Product Bandwidth
Min
Max Units
-
0.5
V
-
1000 mA
-
10
mA
-
1
V
-
150 °C
-
1.35 W
100
-
-
10
-
MHz
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 V_ce and out of the linear region.
25