www.docs.chipfind.ru
D E S C R I P T I O N
K E Y F E A T U R E S
The LXM1700/1700A series of DC/DC
converters are Voltage Regulator
Modules (VRM) which are specifically
designed to meet or exceed the Intel
VRM8.1 DC/DC Converter electrical
specification as well as its mechanical
outline. The LXM1700-xx/1700A-xx is
guaranteed to deliver a maximum
current of at least 14A. These convert-
ers maintain a total tolerance of 5%
maximum, which includes load and
line regulation, temperature stability,
inital accuracy, load transient and
ripple and noise. One of the main
features of these converters is their
ability to program the output voltage
from 1.8 to 3.5V using a 5-bit word
from the processors, providing
automatic voltage adjustment for each
individual processor. Other features
s
s
s
s
s GUARANTEED 14.0A OUTPUT
p TOTAL OUTPUT TOLERANCE OF LESS
THAN 5% -- Includes: Line & load
regulation, temperature stability, initial
accuracy, load transient and ripple & noise.
p ADJUSTABLE OUTPUT VOLTAGE USING A
FIVE-BIT WORD (See Table 1)
p OVER-VOLTAGE DETECTION CROWBARS
THE OUTPUT VOLTAGE IN THE EVENT OF
PASS TRANSISTOR FAILURE - 100%
PROCESSOR PROTECTION (LXM1700-xx)
p HIGH EFFICIENCY -- 85% (TYP.)
p POWER GOOD SIGNAL INDICATES LOW
OUTPUT VOLTAGE
p SOFT-START ELIMINATES TURN-ON
OVERSHOOT
p SHORT-CIRCUIT PROTECTION
p OUTPUT ENABLE /SHUTDOWN
M O D U L E O R D E R I N F O R M AT I O N
LXM1700-05
+5V, +12V
14.0A
Yes
LXM1700-12
+12V
14.0A
LXM1700A-05
+5V, +12V
14.0A
No
LXM1700A-12
+12V
14.0A
Part #
Input
I
MAX
O.V. Protection Crowbar
include high efficiency, short-circuit
protection, over-voltage protection
(LXM1700-xx only), under-voltage
detection, soft start and logic level
output enable functions.
The LXM1700-05/1700A-05 powers
the processor using the 5V supply as
the input power and 12V for the
control bias. The LXM1700-12/
1700A-12 powers the processor using
only the 12V supply and does not need
a separate voltage for the control bias
(see Block Diagram below). The +5V
or the +12V input configuration is
factory set via simple jumper connec-
tions. The LXM1700-12/1700A-12 is
primarily used for multiple processor
applications, such as quad processor
servers, where 5V supplies may not
have the needed current capability.
B L O C K D I A G R A M
LXM1700-05/1700A-05
IN
A
+5V S
UPPLY
A
PPLICATION
LXM1700-12/1700A-12
IN
A
+12V S
UPPLY
A
PPLICATION
P
E N T I U M
I I V R M M
O D U L E
P
R E L I M I N A R Y
D
A T A
S
H E E T
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O V A T I O N
Copyright 1997
Rev. 0.4 4/97
F O R F U R T H E R I N F O R M A T I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841
LXM1700-xx/1700A-xx
1
LIN D
O C
#: 1700
M O D U L E P H O T O
A P P L I C A T I O N S
s PENTIUM II PROCESSOR
s PENTIUM PRO PROCESSOR
s ADVANCED MICROPROCESSOR SUPPLIES
LXM1700-05/1700A-05
V
CC (VID)
V
SS
PWRGD
VID3
VID2
VID1
VID0
OUTEN
P
Disable
5V
12V
LXM1700-12/1700A-12
V
CCP (VID)
V
SS
VID0
OUTEN
P
Disable
12V
5V
IN
12V
IN
12V
IN
UP#
VID4
PWRGD
UP#
VID3
VID2
VID1
VID4
P
E N T I U M
I I V R M M
O D U L E
LXM1700-xx/1700A-xx
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
Copyright 1997
Rev. 0.4 4/97
2
P
R E L I M I N A R Y
D
A T A
S
H E E T
0
1
1
1
1
*
0
1
1
1
0
*
0
1
1
0
1
*
0
1
1
0
0
*
0
1
0
1
1
*
0
1
0
1
0
*
0
1
0
0
1
*
0
1
0
0
0
*
0
0
1
1
1
*
0
0
1
1
0
*
0
0
1
0
1
1.80
0
0
1
0
0
1.85
0
0
0
1
1
1.90
0
0
0
1
0
1.95
0
0
0
0
1
2.00
0
0
0
0
0
2.05
E L E C T R I C A L C H A R A C T E R I S T I C S
Parameter
Symbol
Test Conditions
Units
LXM1700-xx/1700A-xx
Min.
Typ.
Max.
4.75
5
5.25
V
11.4
12
12.6
V
2.945
3.1
3.255
V
0.6
%
15
mV
1
mV
16
mV
95
mV
12
mV
14.0
A
0
A
0.93V
SET
V
0.4
V
0.8
V
2
V
10
ms
80
85
%
80
85
%
3.41
3.57
3.72
V
2
A
0
60
C
100
LFM
Input Voltage Range
+5V
V
IN
+12V
Total Output Voltage Tolerance
V
O
3.1V Set Point
Includes: Initial Accuracy
I
O
= 0.5A, T
A
= 25C
Load Regulation
I
O
= 0.5A to 14.0A
Line Regulation
0.95V
IN
to 1.05V
IN
Temp. Stability
10 to 60C
Load Transient
I
O
= 0.5A to 14.0A, V
IN
= 5V
Output Ripple & Noise
I
O
= 5A
Output Current
Maximum
I
O
V
O
= 3.1V
Minimum
Power Good Threshold
V
THPG
Power Good Output LO Voltage
R
LOPG
I
SINK
= 5mA
Output Enable
OUTEN
LO Level Input Voltage
V
OL
I
OL
= 1mA
HI Level Input Voltage
V
OH
I
OH
= 1mA
Turn-on Response
T
R
0 to 99% of V
O
after V
IN
reaches 90%
Efficiency
LXM1700-05/1700A-05
Eff
I
O
= 14.0A
LXM1700-12/1700A-12
I
O
= 14.0A
Over-Voltage Threshold
LXM1700-xx
V
OV
V
O
= 3.1V
Average Short-Circuit Current
I
SC
V
O
= 0V
Ambient Temperature
T
A
Required Air Flow
I
O
= 14.0A
VID
4
VID
3
VID
2
VID
1
VID
0
(VDC)
Table 1 - Voltage Identification Code
Processor Pins
V
CC (VID)
0 = Connected to V
SS
, 1 = Open or pull-up to V
IN
* Level reserved for future requirements; VRM8.1 output shall be disabled for these VID codes.
1
1
1
1
1
No CPU
1
1
1
1
0
2.1
1
1
1
0
1
2.2
1
1
1
0
0
2.3
1
1
0
1
1
2.4
1
1
0
1
0
2.5
1
1
0
0
1
2.6
1
1
0
0
0
2.7
1
0
1
1
1
2.8
1
0
1
1
0
2.9
1
0
1
0
1
3.0
1
0
1
0
0
3.1
1
0
0
1
1
3.2
1
0
0
1
0
3.3
1
0
0
0
1
3.4
1
0
0
0
0
3.5
VID
4
VID
3
VID
2
VID
1
VID
0
(VDC)
Processor Pins
V
CC (VID)
0 = Connected to V
SS
, 1 = Open or pull-up to V
IN
P
E N T I U M
I I V R M M
O D U L E
LXM1700-xx/1700A-xx
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
3
Copyright 1997
Rev. 0.4 4/97
P
R E L I M I N A R Y
D
A T A
S
H E E T
B1
5V
IN
5V Input Power (not needed for LXM1700-12)
B2
5V
IN
5V Input Power (not needed for LXM1700-12)
B3
Reserved
This pin is reserved for future applications
B4
12V
IN
12V Input Power
B5
UP #
A TTL input indicates the presence of an
upgrade processor. LOW = Upgrade processor
B6
OUTEN
A TTL input that disables output when it
switches to LO state
B7
VID1
Bit 1 of the 5-bit input (see Table 1)
B8
VID3
Bit 3 of the 5-bit input (see Table 1)
B9
PWRGD
An open collector output that switches LO
when output is below the specified range
B10
V
SS
Output voltage return
B11
V
CC (VID)
Output voltage to microprocessor
B12
V
SS
Output voltage return
B13
V
CC (VID)
Output voltage to microprocessor
B14
V
SS
Output voltage return
B15
V
CC (VID)
Output voltage to microprocessor
B16
V
SS
Output voltage return
B17
V
CC (VID)
Output voltage to microprocessor
B18
V
SS
Output voltage return
B19
V
CC (VID)
Output voltage to microprocessor
B20
V
SS
Output voltage return
C O N N E C T O R P I N - O U T S A N D D E S C R I P T I O N S
Pin #
Ref. Desig.
Description
A1
5V
IN
5V Input Power (not needed for LXM1700-12)
A2
5V
IN
5V Input Power (not needed for LXM1700-12)
A3
5V
IN
5V Input Power (not needed for LXM1700-12)
A4
12V
IN
12V Input Power
A5
Reserved
This pin is reserved for future applications
A6
I
SHARE
Consult Factory
A7
VID0
Bit 0 of the 5-bit input (see Table 1)
A8
VID2
Bit 2 of the 5-bit input (see Table 1)
A9
VID4
Bit 4 of the 5-bit input (see Table 1)
A10
V
CC (VID)
Output voltage to microprocessor
A11
V
SS
Output voltage return
A12
V
CC (VID)
Output voltage to microprocessor
A13
V
SS
Output voltage return
A14
V
CC (VID)
Output voltage to microprocessor
A15
V
SS
Output voltage return
A16
V
CC (VID)
Output voltage to microprocessor
A17
V
SS
Output voltage return
A18
V
CC (VID)
Output voltage to microprocessor
A19
V
SS
Output voltage return
A20
V
CC (VID)
Output voltage to microprocessor
Pin #
Ref. Desig.
Description
M O D U L E D I M E N S I O N S
Connector
3.10 (78.74)
2.725 (69.22)
0.188 (4.78)
Power
Board
1.50
(38.1)
Power Board
Component Area
0.80
(20.32)
B20
A20
B1
A1
TOP VIEW
FRONT
VIEW
(Facing Connector)
Connector
0.15 (3.81) Typical
1.00
(25.4)
0.065 (1.65) Ref
0.30 (7.62) Max.
0.26 (6.60) Min.
0.42 (10.67) Typical
0.062 0.008
(1.58 0.20)
Note: All dimensions in inches (mm).
P
E N T I U M
I I V R M M
O D U L E
LXM1700-xx/1700A-xx
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
Copyright 1997
Rev. 0.4 4/97
4
P
R E L I M I N A R Y
D
A T A
S
H E E T
A P P L I C A T I O N I N F O R M A T I O N
VID0
VID1
VID2
VID3
OUTEN
V
CC (VID)
GND
P
GOOD
10K
10K
10K
10K
10K
PENTIUM
PRO
PROCESSOR
CTRL
INPUT
DC
INPUT
4.7K
3.3V
GND
0.1f
DISABLE (LO)
ENABLE (HI or Open)
3.3V
VID Pins
10K
VID4
UP#
LXM1700/1700A
FIGURE 1. -- TYPICAL APPLICATION OF THE LXM1700-xx/1700A-xx
Pentium is a registered trademark of Intel Corporation.
Note: 10k pull-up resistors are optional and needed only in cases of noise suppression or long leads.
PART #
DC INPUT
CTRL INPUT
LXM1700-05/1700A-05
+5V
+12V
LXM1700-12/1700A-12
+12V
N.C.
PDF 
ZIP