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PDF LX8384-15 Data sheet ( Hoja de datos )
| Número de pieza | LX8384-15 | |
| Descripción | 5A LOW DROPOUT POSITIVE REGULATORS | |
| 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 DO C # : 8384
LX8384-xx/8384A-xx/8384B-xx
5A LOW DROPOUT POSITIVE REGULATORS
PRODUCTION DATA SHEET
DESCRIPTION
The LX8384/84A/84B Series ICs are posi-
tive regulators designed to provide 5A
output current. These regulators yield
higher efficiency than currently available
devices with all internal circuitry designed
to operate down to a 1V input-to-output
differential. In each of these products,
the dropout voltage is fully specified as
a function of load current. Dropout is
guaranteed at a maximum of 1.3V
(8384A) and 1.5V (8384) at maximum
output current, decreasing at lower load
currents.
In addition, on-chip trimming adjusts
the reference voltage tolerance to 1%
maximum at room temperature and 2%
maximum over the 0 to 125°C range
for the LX8384A, making this ideal for
the Pentium P54C-VRE specification.
The LX8384B offers 0.8% tolerance at
room temperature and 1.0% maximum
over line, load and temperature.
Fixed versions are also available and
specified in the Available Options table
below.
The LX8384/84A/84B Series devices
are pin-compatible with earlier 3-
terminal regulators, such as the 117 series
products. While a 10µF output capacitor
is required on both input and output of
these new devices, this capacitor is
generally included in most regulator
designs.
The LX8384/84A/84B Series quiescent
current flows into the load, thereby
increasing efficiency. This feature
constrasts with PNP regulators where up
to 10% of the output current is wasted as
quiescent current. The LX8384-xxI is
specified over the industrial temperature
range of -25°C to 125°C, while the
LX8384-xxC/84A-xxC/84B-xxC is
specified over the commercial range of
0°C to 125°C.
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
3.5V, 5A R E G U L AT O R
5V
*1500µF
6MV1500GX
Sanyo
IN LX8384A OUT
121Ω
ADJ 0.1%
3.5V at 5A
1500µF*
5x 6MV1500GX
Sanyo
*218Ω
0.1%
Capacitors must
have < 20mΩ Total ESR.
KEY FEATURES
s THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT
s GUARANTEED < 1.3V HEADROOM AT 5A
(LX8384A-xx)
s GUARANTEED 2.0% MAX. REFERENCE
TOLERANCE (LX8384A-xx)
s GUARANTEED 1.0% MAX. REFERENCE
TOLERANCE (LX8384B-xx)
s OUTPUT CURRENT OF 5A MINIMUM
p 0.015% LINE REGULATION
p 0.15% LOAD REGULATION
A P P L I C AT I O N S
s PENTIUM® PROCESSOR VRE APPLICATIONS
s HIGH EFFICIENCY LINEAR REGULATORS
s POST REGULATORS FOR SWITCHING POWER
SUPPLIES
s BATTERY CHARGERS
s CONSTANT CURRENT REGULATORS
s CYRIX® 6x86TM
s AMD-K5TM
AVAILABLE O PTIONS PER PAR T #
Part #
Output
Voltage
LX8384/84A/84B-00 Adjustable
LX8384/84A/84B-15
1.5V
LX8384/84A/84B-33
3.3V
Other voltage options may be available —
Please contact factory for details.
An application of the LX8384A for the Pentium P54C processors meeting VRE specfication.
Copyright © 1997
Rev. 1.9 12/97
TA (°C)
PACKAGE ORDER INFORMATION
Max. Ref.
Accuracy
Max. Dropout
Voltage
P
Plastic TO-220
3-pin
DD
Plastic
3-pin
TO-263
2.0%
1.5V
LX8384-xxCP
LX8384-xxCDD
0 to 125
2.0%
1.0%
1.3V
1.3V
LX8384A-xxCP
LX8384B-xxCP
LX8384A-xxCDD
LX8384B-xxCDD
-25 to 125
2.0%
1.5V
LX8384-xxIP
LX8384-xxIDD
Note: All surface-mount packages are available in Tape & Reel, append the letter "T" to part number.
(i.e. LX8384A-xxCDDT) "xx" refers to output voltage, please see table above.
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
1 page  
PRODUCT DATABOOK 1996/1997
LX8384-xx/8384A-xx/8384B-xx
5A LOW DROPOUT POSITIVE REGULATORS
PRODUCTION DATA SHEET
APPLICATION NOTES
The LX8384/84A/84B Series ICs are easy to use Low-Dropout (LDO)
voltage regulators. They have all of the standard self-protection
features expected of a voltage regulator: short circuit protection,
safe operating area protection and automatic thermal shutdown if
the device temperature rises above approximately 165°C.
Use of an output capacitor is REQUIRED with the LX8384/84A/
84B series. Please see the table below for recommended minimum
capacitor values.
These regulators offer a more tightly controlled reference voltage
tolerance and superior reference stability when measured against
the older pin-compatible regulator types that they replace.
STABILITY
The output capacitor is part of the regulator’s frequency compen-
sation system. Many types of capacitors are available, with different
capacitance value tolerances, capacitance temperature coefficients,
and equivalent series impedances. For all operating conditions,
connection of a 220µF aluminum electrolytic capacitor or a 47µF
solid tantalum capacitor between the output terminal and ground
will guarantee stable operation.
If a bypass capacitor is connected between the output voltage
adjust (ADJ) pin and ground, ripple rejection will be improved
(please see the section entitled “RIPPLE REJECTION”). When ADJ
pin bypassing is used, the required output capacitor value increases.
Output capacitor values of 220µF (aluminum) or 47µF (tantalum)
provide for all cases of bypassing the ADJ pin. If an ADJ pin bypass
capacitor is not used, smaller output capacitor values are adequate.
The table below shows recommended minimum capacitance values
for stable operation.
RECOMMENDED CAPACITOR VALUES
INPUT
10µF
10µF
OUTPUT
15µF Tantalum, 100µF Aluminum
47µF Tantalum, 220µF Aluminum
ADJ
None
15µF
To ensure good transient response from the power supply system
under rapidly changing current load conditions, designers generally
use several output capacitors connected in parallel. Such an
arrangement serves to minimize the effects of the parasitic resistance
(ESR) and inductance (ESL) that are present in all capacitors. Cost-
effective solutions that sufficiently limit ESR and ESL effects gener-
ally result in total capacitance values in the range of hundreds to
thousands of microfarads, which is more than adequate to meet
regulator output capacitor specifications. Output capacitance
values may be increased without limit.
The circuit shown in Figure 1 can be used to observe the transient
response characteristics of the regulator in a power system under
changing loads. The effects of different capacitor types and values
on transient response parameters, such as overshoot and under-
shoot, can be compared quickly in order to develop an optimum
solution.
Power Supply
IN LX8384/84A OUT
/84B
ADJ
Minumum Load
(Larger resistor)
Full Load
(Smaller resistor)
RDSON << RL
Star Ground
1 sec
10ms
FIGURE 1 — DYNAMIC INPUT and OUTPUT TEST
OVERLOAD RECOVERY
Like almost all IC power regulators, the LX8384/84A/84B regulators
are equipped with Safe Operating Area (SOA) protection. The SOA
circuit limits the regulator's maximum output current to progressively
lower values as the input-to-output voltage difference increases. By
limiting the maximum output current, the SOA circuit keeps the
amount of power that is dissipated in the regulator itself within safe
limits for all values of input-to-output voltage within the operating
range of the regulator. The LX8384/84A/84B SOA protection system
is designed to be able to supply some output current for all values
of input-to-output voltage, up to the device breakdown voltage.
Under some conditions, a correctly operating SOA circuit may
prevent a power supply system from returning to regulated opera-
tion after removal of an intermittent short circuit at the output of the
regulator. This is a normal mode of operation which can be seen in
most similar products, including older devices such as 7800 series
regulators. It is most likely to occur when the power system input
voltage is relatively high and the load impedance is relatively low.
When the power system is started “cold”, both the input and
output voltages are very close to zero. The output voltage closely
follows the rising input voltage, and the input-to-output voltage
difference is small. The SOA circuit therefore permits the regulator
to supply large amounts of current as needed to develop the
designed voltage level at the regulator output.
Now consider the case where the regulator is supplying regulated
voltage to a resistive load under steady state conditions. A moderate
input-to-output voltage appears across the regulator but the voltage
difference is small enough that the SOA circuitry allows sufficient
current to flow through the regulator to develop the designed output
voltage across the load resistance. If the output resistor is short-
circuited to ground, the input-to-output voltage difference across the
regulator suddenly becomes larger by the amount of voltage that had
appeared across the load resistor. The SOA circuit reads the
increased input-to-output voltage, and cuts back the amount of
current that it will permit the regulator to supply to its output
terminal. When the short circuit across the output resistor is
removed, all the regulator output current will again flow through the
output resistor. The maximum current that the regulator can supply
to the resistor will be limited by the SOA circuit, based on the large
input-to-output voltage across the regulator at the time the short
circuit is removed from the output. If this limited current is not
sufficient to develop the designedvoltage across the output resistor,
Copyright © 1997
Rev. 1.9 12/97
5
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