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PDF LX1431 Data sheet ( Hoja de datos )
| Número de pieza | LX1431 | |
| Descripción | PROGRAMMABLE REFERENCE | |
| Fabricantes | Microsemi Corporation | |
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T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N D O C #: 1431
LX1431
PROGRAMMABLE REFERENCE
PR O D U C T I O N D ATA S H E E T
DESCRIPTION
The LX1431 is an adjustable shunt voltage
regulator featuring 100mA sink capability, a
0.4% initial reference voltage tolerance and
a 0.3% typical temperature stability. This
product, which is ideal for use in Pentium®
applications, is equipped with on-chip di-
vider resistors, enabling it to be configured
as a 5V shunt regulator. In this configura-
tion, the LX1431 has an initial voltage toler-
ance of only 1% and requires no additional
external components. The Linfinity
LX1431EB evaluation board and design kit
is available to assist engineers in quickly
configuring the most efficient, cost-effective
Pentium designs.
The output voltage of the LX1431 may be
set to any value between 2.5V and 36V
through the addition of two external resis-
tors, which is of particular importance in the
design of both adjustable and switching
power supplies. In addition, the nominal
internal current limit of 100mA may be de-
creased with the addition of a single exter-
nal resistor.
For applications requiring an adjustable
reference, the Linfinity LX6431CLP, a simpli-
fied three-pin programmable reference, may
be used. Because the LX6431 is pin-for-pin
compatible with Linfinity's earlier TL431, use
of this product provides designers a simple
migration path to the more robust LX6431.
A separate LX6431 data sheet is available
which details the specifics of this product.
In addition, Pentium designers may use
Linfinity's LX8585/8585A 4.6A or LX8584/
8584A 7A Low Dropout Regulators to achieve
the most optimum motherboard configura-
tion.
KEY FEATURES
p GUARANTEED 0.4% INITIAL VOLTAGE
TOLERANCE
p 0.1Ω TYPICAL DYNAMIC OUTPUT
IMPEDANCE
p FAST TURN-ON
p SINK CURRENT CAPABILITY, 1mA TO 100mA
p LOW REFERENCE PIN CURRENT
A P P L I C AT I O N S
s LINEAR REGULATORS
s ADJUSTABLE POWER SUPPLIES
s SWITCHING POWER SUPPLIES
s LX1431EB EVALUATION BOARD FOR
PENTIUM APPLICATIONS AVAILABLE.
CONSULT FACTORY.
PRODUCT HIGHLIGHT
THE LX8584A AND LX1431 I N 75 AND 166MHZ P54C P ROCESSOR A PPLICATIONS USING 3.3V C ACHE
32
5V VIN VOUT
LX8584A
1kW
VO 7A
(See Table Below)
3x
330µF, 6.3V
Low ESR
PLACE IN µP SOCKET CAVITY
ADJ
1
250pF
0.01µF
1kW
Oscon Type
from Sanyo
100µF x 6
10V
220µF
10V
2
3 V+
1
COL REF 8
1k
0.1%
AVX TYPE
TPS
µP
Load
Low ESR
from
Sanyo
0.1µF
50V
LX1431
SGND FGND
2.84kW
0.1%
21k
1%
JP1
1µF x 10
SMD
56
V
O
3.50
3.38
Copyright © 1997
Rev. 1.2 4/97
JP1
Short
Open
TYPICAL APPLICATION
120/166MHz, VRE, 3.3V Cache
75/90/100/133MHz, STND, 3.3V Cache
Thick traces represent high current traces which
must be low resistance / low inductance traces in
order to achieve good transient response.
PACKAGE ORDER INFORMATION
TA (°C)
M
Plastic DIP
8-pin
DM
Plastic
8-pin
SOIC
0 to 70
LX1431CM
LX1431CDM
-40 to 85
LX1431IM
LX1431IDM
Note: All surface mount packages are available in Tape & Reel.
Append the letter "T" to part number (i.e. LX1431CDMT).
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1
1 page  
PRODUCT DATABOOK 1996/1997
PROGRAMMABLE REFERENCE
PR O D U C T I O N D ATA S H E E T
GRAPH / CURVE INDEX
Characteristic Curves
FIGURE #
1. COLLECTOR V vs. TEMPERATURE vs. CURRENT
SAT
2. COMPENSATION PIN VOLTAGE vs. TEMPERATURE vs. ICOLL
3. ILIMIT vs. TEMPERATURE WITH EXTERNAL RESISTOR
4. REFERENCE VOLTAGE and REFERENCE CURRENT vs. V+
5. REFERENCE VOLTAGE and REFERENCE CURRENT vs. V+
6. 2.5V REFERENCE I vs. V
K KA
7. REFERENCE VOLTAGE and REFERENCE CURRENT vs. TEMPERATURE
LX1431
Copyright © 1997
Rev. 1.2 4/97
5
5 Page | ||
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