Datasheet LXM1700-05, LXM1700A-12, LXM1700A-05, LXM1700-12 Datasheet (Microsemi Corporation)

LIN DOC #:

LXM1700-xx/1700A-xx

P ENTIUM® II VRM MODULE

1700

THE INFINITE POWER OF INNOVATION

DESCRIPTION KEY FEATURES

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.

PRELIMINARY DATA SHEET

■■

■ 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

APPLICATIONS

■ PENTIUM II PROCESSOR

■ PENTIUM PRO PROCESSOR

■ ADVANCED MICROPROCESSOR SUPPLIES

MODULE PHOTO

Part # Input I

LXM1700-05 +5V, +12V 14.0A

LXM1700-12 +12V 14.0A
LXM1700A-05 +5V, +12V 14.0A
LXM1700A-12 +12V 14.0A

BLOCK DIAGRAM

5V 12V

5V

12V

IN

V

CC (VID)

V

SS

UP#

µP

Disable

PWRGD

VID4
VID3
VID2
VID1
VID0

OUTEN

LXM1700-05/1700A-05

IN A +5V SUPPLY APPLICATION

MODULE ORDER INFORMATION

MAX

O.V. Protection Crowbar

IN

µP

LXM1700-05/1700A-05

Disable

LXM1700-12/1700A-12

IN A +12V SUPPLY APPLICATION

Yes

No

12V

12V

V

CCP (VID)

V

SS

UP#
PWRGD

VID4
VID3
VID2
VID1
VID0

OUTEN

IN

LXM1700-12/1700A-12

Copyright © 1997
Rev. 0.4 4/97

FOR FURTHER INFORMATION CALL [phone]

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841

1

PRODUCT DATABOOK 1996/1997

LXM1700-xx/1700A-xx

P ENTIUM® II VRM MODULE

RELIMINARY DATA SHEET

P

ELECTRICAL CHARACTERISTICS

Parameter

Input Voltage Range +5V V

Total Output Voltage Tolerance VO3.1V Set Point

Includes:

Output Current Maximum I

Power Good Threshold V

Power Good Output LO Voltage R
Output Enable OUTEN

Turn-on Response T

Efficiency LXM1700-05/1700A-05 Eff I

Over-Voltage Threshold LXM1700-xx V

Average Short-Circuit Current I
Ambient Temperature T

Required Air Flow IO = 14.0A

Initial Accuracy IO = 0.5A, TA = 25°C

Load Regulation I
Line Regulation 0.95VIN to 1.05V

Temp. Stability 10 to 60°C
Load Transient IO = 0.5A to 14.0A, VIN = 5V
Output Ripple & Noise IO = 5A

Minimum

LO Level Input Voltage V
HI Level Input Voltage V

LXM1700-12/1700A-12 IO = 14.0A

Symbol

IN

+12V

O

THPG

LOPGISINK

OLIOL

OHIOH

R

OVVO

SC

A

Test Conditions Units

= 0.5A to 14.0A

O

IN

VO = 3.1V

= 5mA

= 1mA

= 1mA

0 to 99% of VO after VIN reaches 90%

= 14.0A

O

= 3.1V

VO = 0V

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

1mV

16 mV
95 mV

12 mV

14.0 A
0A

0.93V

SET

0.4 V

0.8 V

2V

10 ms
80 85 %

80 85 %

3.41 3.57 3.72 V

2A

060°C

100 LFM

V

Table 1 - Voltage Identification Code

0 = Connected to VSS , 1 = Open or pull-up to V

Processor Pins

VID4 VID3 VID2 VID1 VID0 (VDC)

01111 *
01110 *
01101 *
01100 *
01011 *
01010 *
01001 *
01000 *
00111 *
00110 *

00101 1.80
00100 1.85
00011 1.90
00010 1.95
00001 2.00
00000 2.05

* Level reserved for future requirements; VRM8.1 output shall be disabled for these VID codes.

V

IN

CC (VID)

0 = Connected to VSS , 1 = Open or pull-up to V

Processor Pins

V

IN

CC (VID)

VID4 VID3 VID2 VID1 VID0 (VDC)

11111No CPU
11110 2.1
11101 2.2
11100 2.3
11011 2.4
11010 2.5
11001 2.6
11000 2.7
10111 2.8

10110 2.9
10101 3.0
10100 3.1
10011 3.2
10010 3.3
10001 3.4
10000 3.5

2

Copyright © 1997

Rev. 0.4 4/97

PRODUCT DATABOOK 1996/1997

LXM1700-xx/1700A-xx

P ENTIUM® II VRM MODULE

P RELIMINARY DATA SHEET

CONNECTOR PIN-OUTS AND DESCRIPTIONS

Pin # Ref. Desig. Description

A1 5V

A2 5V
A3 5V
A4 12V

IN

IN

IN

IN

A5 Reserved This pin is reserved for future applications
A6 I

SHARE

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
A11 V

A12 V

A13 V
A14 V

A15 V
A16 V

A17 V

A18 V
A19 V

A20 V

CC (VID)

SS

CC (VID)

SS

CC (VID)

SS

CC (VID)

SS

CC (VID)

SS

CC (VID)

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

Consult Factory

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 # Ref. Desig. Description

B1 5V

B2 5V

IN

IN

B3 Reserved This pin is reserved for future applications

B4 12V

IN

B5 UP # A TTL input indicates the presence of an

B6 OUTEN A TTL input that disables output when it

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

B10 V
B11 V

B12 V
B13 V

B14 V

B15 V
B16 V

B17 V
B18 V

B19 V

B20 V

SS

CC (VID)

SS

CC (VID)

SS

CC (VID)

SS

CC (VID)

SS

CC (VID)

SS

5V Input Power (not needed for LXM1700-12)

5V Input Power (not needed for LXM1700-12)

12V Input Power

upgrade processor. LOW = Upgrade processor

switches to LO state

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

0.188 (4.78)

TOP VIEW

FRONT

VIEW

(Facing Connector)

1.50

(38.1)

1.00

(25.4)

MODULE DIMENSIONS

3.10 (78.74)

2.725 (69.22)

0.30 (7.62) Max. 0.26 (6.60) Min.

Connector

0.065 (1.65) Ref

Power Board

Component Area

B20

A20

Note: All dimensions in inches (mm).

Connector

0.15 (3.81) Typical

Power
Board

0.42 (10.67) Typical

0.80

(20.32)

B1

A1

0.062 ±0.008
(1.58 ±0.20)

Copyright © 1997
Rev. 0.4 4/97

3

PRODUCT DATABOOK 1996/1997

LXM1700-xx/1700A-xx

P ENTIUM® II VRM MODULE

RELIMINARY DATA SHEET

P

APPLICATION INFORMATION

3.3V

10K

10K

10K

10K

10K

CTRL

INPUTDCINPUT

10K

DISABLE (LO)

ENABLE (HI or Open)

Note: 10k pull-up resistors are optional and needed only in cases of noise suppression or long leads.

VID0
VID1
VID2

V

CC (VID)

GND

UP#

GND

VID3
VID4

P

OUTEN

GOOD

LXM1700/1700A

PART # DC INPUT CTRL INPUT

LXM1700-05/1700A-05 +5V +12V
LXM1700-12/1700A-12 +12V N.C.

FIGURE 1. — TYPICAL APPLICATION OF THE LXM1700-xx/1700A-xx

3.3V

PENTIUM

PRO

PROCESSOR

4.7K

VID Pins

0.1µf

Pentium is a registered trademark of Intel Corporation.

4

Copyright © 1997

Rev. 0.4 4/97