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LIN DOC #: 1700
LXM1700-xx/1700A-xx
P
T
HE
ENTIUM
(R)
II VRM M
D
ATA
ODULE
I
NFINITE
P
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OF
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N N O VAT I O N
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RELIMINARY
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HEET
DESCRIPTION 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 converters 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 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 connections. 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.
K E Y F E AT U R E 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
A P P L I C AT I O N S
s PENTIUM II PROCESSOR s PENTIUM PRO PROCESSOR s ADVANCED MICROPROCESSOR SUPPLIES
MODULE PHOTO
BLOCK DIAGRAM
5V 12V 12V
5VIN 12VIN
12VIN VSS UP# PWRGD VID4 VID3 VID2 VID1 VID0 OUTEN
LXM1700-05/1700A-05
VSS UP# PWRGD VID4 VID3 VID2 VID1 VID0 OUTEN
P
P
Disable
Disable
LXM1700-05/1700A-05 IN A +5V SUPPLY APPLICATION
M O D U L E O R D E R I N F O R M AT I O N
LXM1700-12/1700A-12 IN A +12V SUPPLY APPLICATION
Part #
LXM1700-05 LXM1700-12 LXM1700A-05 LXM1700A-12
Input
+5V, +12V +12V +5V, +12V +12V
IMAX
14.0A 14.0A 14.0A 14.0A
O.V. Protection Crowbar
Yes No
F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
Copyright (c) 1997 Rev. 0.4 4/97
LXM1700-12/1700A-12
VCC (VID)
VCCP (VID)
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1
PRODUCT DATABOOK 1996/1997
LXM1700-xx/1700A-xx
P
P
ENTIUM
(R)
II VRM M
D
ATA
ODULE
RELIMINARY
S
HEET
ELECTRICAL Parameter
Input Voltage Range Total Output Voltage Tolerance Includes: Initial Accuracy Load Regulation Line Regulation Temp. Stability Load Transient Output Ripple & Noise Output Current +5V +12V
CHARACTERISTICS Test Conditions LXM1700-xx/1700A-xx Min. Typ. Max.
4.75 11.4 2.945 5 12 3.1 0.6 15 1 16 95 12 5.25 12.6 3.255
Symbol
VIN VO
Units
V V V % mV mV mV mV mV A A V V V V ms % % V A C LFM
Maximum Minimum
IO VTHPG RLOPG OUTEN VOL VOH TR Eff VOV ISC TA
3.1V Set Point IO = 0.5A, TA = 25C I O = 0.5A to 14.0A 0.95VIN to 1.05V IN 10 to 60C I O = 0.5A to 14.0A, VIN = 5V I O = 5A VO = 3.1V
14.0 0 0.93VSET
Power Good Threshold Power Good Output LO Voltage Output Enable LO Level Input Voltage HI Level Input Voltage Turn-on Response Efficiency LXM1700-05/1700A-05 LXM1700-12/1700A-12 Over-Voltage Threshold LXM1700-xx Average Short-Circuit Current Ambient Temperature Required Air Flow
ISINK = 5mA IOL = 1mA IOH = 1mA 0 to 99% of VO after VIN reaches 90% IO = 14.0A IO = 14.0A VO = 3.1V VO = 0V IO = 14.0A
0.4 0.8 2 10 80 80 3.41 0 100 85 85 3.57 2
3.72 60
Table 1 - Voltage Identification Code
0 = Connected to VSS , 1 = Open or pull-up to VIN
Processor Pins VID2
1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0
VCC (VID) (VDC)
* * * * * * * * * * 1.80 1.85 1.90 1.95 2.00 2.05
0 = Connected to VSS , 1 = Open or pull-up to VIN
Processor Pins VID2
1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0
VCC (VID) (VDC)
No CPU 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5
VID4
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
VID3
1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
VID1
1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0
VID0
1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
VID4
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
VID3
1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
VID1
1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0
VID0
1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
* Level reserved for future requirements; VRM8.1 output shall be disabled for these VID codes.
2
Copyright (c) 1997 Rev. 0.4 4/97
PRODUCT DATABOOK 1996/1997
LXM1700-xx/1700A-xx
P
P
ENTIUM
(R)
II VRM M
D
ATA
ODULE
RELIMINARY
S
HEET
CONNECTOR PIN-OUTS AND DESCRIPTIONS Pin #
A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20
Ref. Desig.
5VIN 5VIN 5VIN 12VIN Reserved ISHARE VID0 VID2 VID4 VCC (VID) VSS VCC (VID) VSS VCC (VID) VSS VCC (VID) VSS VCC (VID) VSS VCC (VID)
Description
5V Input Power (not needed for LXM1700-12) 5V Input Power (not needed for LXM1700-12) 5V Input Power (not needed for LXM1700-12) 12V Input Power This pin is reserved for future applications Consult Factory Bit 0 of the 5-bit input (see Table 1) Bit 2 of the 5-bit input (see Table 1) Bit 4 of the 5-bit input (see Table 1) Output voltage to microprocessor Output voltage return Output voltage to microprocessor Output voltage return Output voltage to microprocessor Output voltage return Output voltage to microprocessor Output voltage return Output voltage to microprocessor Output voltage return Output voltage to microprocessor
Pin #
B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16 B17 B18 B19 B20
Ref. Desig.
5VIN 5VIN Reserved 12VIN UP # OUTEN VID1 VID3 PWRGD VSS VCC (VID) VSS VCC (VID) VSS VCC (VID) VSS VCC (VID) VSS VCC (VID) VSS
Description
5V Input Power (not needed for LXM1700-12) 5V Input Power (not needed for LXM1700-12) This pin is reserved for future applications 12V Input Power A TTL input indicates the presence of an upgrade processor. LOW = Upgrade processor A TTL input that disables output when it switches to LO state Bit 1 of the 5-bit input (see Table 1) Bit 3 of the 5-bit input (see Table 1) An open collector output that switches LO when output is below the specified range Output voltage return Output voltage to microprocessor Output voltage return Output voltage to microprocessor Output voltage return Output voltage to microprocessor Output voltage return Output voltage to microprocessor Output voltage return Output voltage to microprocessor Output voltage return
MODULE DIMENSIONS
3.10 (78.74) 0.188 (4.78) 2.725 (69.22)
TOP VIEW
1.00 (25.4) 1.50 (38.1)
0.30 (7.62) Max.
0.26 (6.60) Min. 0.15 (3.81) Typical
Connector
Power Board 0.42 (10.67) Typical
0.065 (1.65) Ref
(Facing Connector)
A20
FRONT VIEW
Power Board Component Area
B20
Connector
B1
0.80 (20.32)
A1
0.062 0.008 (1.58 0.20)
Note: All dimensions in inches (mm).
Copyright (c) 1997 Rev. 0.4 4/97
3
PRODUCT DATABOOK 1996/1997
LXM1700-xx/1700A-xx
P
P
ENTIUM
(R)
II VRM M
D
ATA
ODULE
RELIMINARY
S
HEET
A P P L I C AT I O N I N F O R M AT I O N
3.3V
10K 10K 10K 10K 10K 10K
CTRL INPUT
DC INPUT
VID0 VID1 VID2 VID3 VID4 DISABLE (LO) ENABLE (HI or Open) OUTEN
UP# VCC (VID) GND GND 3.3V 4.7K PGOOD 0.1f
PENTIUM PRO PROCESSOR
VID Pins
LXM1700/1700A
PART # LXM1700-05/1700A-05 LXM1700-12/1700A-12
DC INPUT +5V +12V
CTRL INPUT +12V N.C.
FIGURE 1. -- TYPICAL APPLICATION OF THE LXM1700-xx/1700A-xx
Note: 10k pull-up resistors are optional and needed only in cases of noise suppression or long leads.
Pentium is a registered trademark of Intel Corporation.
4
Copyright (c) 1997 Rev. 0.4 4/97

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