Virtex-4 ML455 PCI/PCI-X Board
21
UG084 (v1.0) May 17, 2005
Voltage Regulators
R
Voltage Regulator Circuit Descriptions
This section describes the voltage regulators on the ML455 board.
LT1764A Voltage Regulators
shows the LT1764A 5-pin linear 3A capable voltage regulators (U2, U3, and U4),
www.linear-tech.com
):
Table 3-9:
Power Supplies
Designation
Input
Output
I
Max
Device Type
Primary Use
None
5V
N/A
PCI
Edge Connector
A5, A8, A61, A62, B5,
B6, B61, B62
Voltage Regulator Input U3
PCI 64-bit Socket J1
LED Power D5, D6
VR1 1.25V V
TT
Regulator
None
3.3V
N/A
PCI
Edge Connector
A10, A16, A21, A27,
A33, A39, A45, A53,
A59, A66, A75, AB4,
B19, B25, B31, B36,
B91, B93, B54, B59,
B70, B79, B88
Voltage Regulator Input for
U2, U4, and U7.
LED Power D1, D2, D3, D4
Y3 Osc V
CC
PCI 64-bit Socket J1
U3
5V
3.0V
3A
LT1764A (adj.)
U10 LX25 Banks 3, 6, 10
V
CCO
U8 Clk Buf V
CC
U2
3.3V
2.5V
3A
LT1764A (adj.)
U10 LX25 Banks 1, 2, 4, 7, 8
V
CCO
and V
CCAUX
J4 SODIMM Socket
U5 MAX3316 V
CC
U1 XC32FP V
CCO
Y1,Y2 Oscillator V
CC
P9 PC IV Cable Connector
U7
3.3V
1.8V
0.5A
LT1763CS8
U6 XC (CPLD) V
CC
U1 XC32FP V
CCINT
, V
CCJ
U4
3.3V
1.2V
3A
LT1764A (adj.)
U10 LX25 V
CCINT
VR1
5V
1.25V
6A
PTH0505Y-AH
J4 SODIMM Socket V
REF
Memory Term. R Pullup V
Notes:
1. On-board voltage regulators are shown in the schematics provided on the kit CD, on schematic sheet 17.
www.BDTIC.com/XILINX