LX8582A-00CV [MICROSEMI]
8.5A LOW DROPOUT POSITIVE REGULATORS; 8.5A低压差正稳压器
| 型号： | LX8582A-00CV |
| 厂家： | 
Microsemi |
| 描述： | 8.5A LOW DROPOUT POSITIVE REGULATORS |
| 文件： | 总7页 (文件大小：201K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LIN DOC #: 8582
LX8582A-xx
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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 V A T I O N
P R O D U C T I O N D A T A S H E E T
DESCRIPTION
KEY FEATURES
■ THREE-TERMINAL AJUSTABLE OR FIXED
The LX8582A series ICs are low
to ensure adequate output current and
OUTPUT
dropout three-terminal positive regula-
tors with 8.5A rated output current.
Processor applications such as the
Cyrix® 6x86TM & 6x86LTM, Pentium®
Processor and Power PCTM applications
requiring fast transient response are
ideally suited for this product family.
The LX8582A series products are
guaranteed to have < 1.3V at 8.5A
and are ideal to provide well-regulated
outputs of 2.5V to 3.6V using a 5V
input supply in the adjustable version,
or an output of 3.3V using a 5V input
supply in the fixed version.
controlled short-circuit current. On-
chip thermal limiting provides protec-
tion against any combination of
overload that would create excessive
junction temperatures.
The LX8582A series ICs are available
in both the through-hole versions of the
industry standard 3-pin TO-220 and TO-
247 power packages.
For use in VRE applications, the
LX1431 Programmable Reference in
conjunction with this family of regula-
tors offers precision output voltage.
See the LX1431 data sheet for informa-
tion on this product.
■
GUARANTEED ≤ 1.3V HEADROOM AT 8.5A
■ OUTPUT CURRENT OF 8.5A
p FAST TRANSIENT RESPONSE
p 1% VOLTAGE REFERENCE INITIAL
ACCURACY
p OUTPUT SHORT CIRCUIT PROTECTION
p BUILT-IN THERMAL SHUTDOWN
■ EVALUATION BOARD AVAILABLE:
REQUEST LXE9001 EVALUATION KIT
APPLICATIONS
■ CYRIX 6x86 & 6x86L APPLICATIONS
■ PENTIUM PROCESSOR SUPPLIES
■ POWER PC SUPPLIES
Current limit is trimmed above 8.6A
■ MICROPROCESSOR SUPPLIES
■ LOW VOLTAGE LOGIC SUPPLIES
■ POST REGULATOR FOR SWITCHING SUPPLY
PRODUCT HIGHLIGHT
CYRIX 6X86 VOLTAGE SUPPLY
3.38V, 8.5A REGULATOR
■ LXE9001 EVALUATION BOARD FOR
PENTIUM APPLICATIONS AVAILABLE.
CONSULT FACTORY.
AVAILABLE OPTIONS PER PAR T #
IN
OUT
3.38V at 8.5A
VIN 4.75V
LX8582A
Output
Part #
R1
Voltage
1500µF
2x 330µF, 6.3V
Oscon SA type
from Sanyo
-or-
121
VREF
ADJ
6.3V
6MV1500GX
from Sanyo
LX8582A-00
LX8582A-33
Adjustable
3.3V
1%
4x 1500µF, 6.3V
6MV1500GX
from Sanyo
Other voltage options may be available —
Please contact factory for details.
IADJ = 50µA
+ IADJ R2
R2
205
1%
R2
R1
VOUT = VREF 1 +
Application of the LX8582A for the Cyrix 6x86 processor family.
This circuit is designed to have less than 130mV dynamic response to a 8.5A load transient.
PACKAGE ORDER INFORMATION
Plastic TO-220
3-pin
Plastic TO-247
3-terminal
Dropout
Voltage
TA (°C)
P
V
0 to 125
1.3V
LX8582A-xxCP
LX8582A-xxCV
"xx" refers to output voltage, please see table above.
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 © 1997
Rev. 1.1 1/97
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ABSOLUTE MAXIMUM RATINGS (Note 1)
PACKAGE PIN OUTS
Power Dissipation .................................................................................. Internally Limited
Input Voltage................................................................................................................ 10V
Input to Output Voltage Differential........................................................................... 10V
Operating Junction Temperature
Plastic (P Package) ................................................................................................ 150°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C
TAB IS VOUT
3
VIN
2
1
VOUT
ADJ /
GND*
P PACKAGE
(Top View)
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect
to Ground. Currents are positive into, negative out of the specified terminal.
* Pin 1 is GND for fixed voltage versions.
TAB ON REVERSE SIDE IS VOUT
THERMAL DATA
P PACKAGE:
3
VIN
2
1
VOUT
THERMAL RESISTANCE-JUNCTION TO TAB, θJT
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
V PACKAGE:
2.7°C/W
60°C/W
ADJ /
GND*
V PACKAGE
THERMAL RESISTANCE-JUNCTION TO TAB, θJT
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
1.6°C/W
35°C/W
(Top View)
* Pin 1 is GND for fixed voltage versions.
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow.
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ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8582A-xxC with 0°C ≤ TA ≤ 125°C; VIN - VOUT
=
3V; IOUT = 8.5A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
LX8582A-00 (Adjustable)
LX8582A-00
Min. Typ.
Parameter
Symbol
Test Conditions
Units
Max.
Reference Voltage
VREF
IOUT = 10mA, TA = 25°C
10mA ≤ IOUT ≤ 8.5A, 1.5V ≤ (V - VOUT), VIN ≤ 7V, P ≤ PMAX
1.238 1.250 1.262
1.225 1.250 1.275
V
V
IN
Line Regulation (Note 2)
Load Regulation (Note 2)
Thermal Regulation
∆VREF (V ) IOUT = 10mA, 1.5V ≤ (VIN - VOUT), VIN ≤ 7V
0.035
0.1
0.01
83
0.2
0.5
0.02
%
IN
∆VREF (IOUT
)
(VIN - VOUT) = 3V, 10mA ≤ IOUT ≤ 8.5A
∆VOUT(Pwr) TA = 25°C, 20ms pulse
VOUT = 3.3V, f =120Hz, COUT = 100µf Tantalum, VIN = 5V
%
%/W
dB
Ripple Rejection (Note 3)
65
CADJ = 10µF, TA = 25°C, IOUT = 8.5A
Adjust Pin Current
IADJ
∆IADJ
∆V
55
0.2
1.1
100
5
1.3
10
µA
µA
V
Adjust Pin Current Change
Dropout Voltage
Minimum Load Current
Maximum Output Current
Temperature Stability
Long Term Stability
10mA ≤ IOUT ≤ 8.5A, 1.5V ≤ (V - VOUT), VIN ≤ 7V
IN
∆VREF = 1%, IOUT = 8.5A
IOUT(MIN) VIN ≤ 7V
2
9.2
mA
A
IOUT(MAX) 1.4V ≤ (VIN - VOUT), VIN ≤ 7V
∆VOUT (T)
8.6
0.25
0.3
0.003
%
∆VOUT (t) TA = 125°C, 1000 hrs
VOUT (RMS) TA = 25°C, 10Hz ≤ f ≤ 10kHz
1
%
%
RMS Output Noise (% of VOUT
)
LX8582A-33 (3.3V Fixed)
Parameter
LX8582A-33
Symbol
Test Conditions
Units
Min. Typ.
Max.
Output Voltage (Note 4)
VOUT
VIN = 5V, IOUT = 0mA, TA = 25°C
4.75V ≤ VIN ≤ 10V, 0mA ≤ IOUT ≤ 8.5A, P ≤ PMAX
3.267
3.235
3.3
3.3
1
3.333
3.365
6
V
V
Line Regulation (Note 2)
∆VOUT 4.75V ≤ VIN ≤ 7V
(VIN)
mV
mV
mV
% / W
dB
mA
V
4.75V ≤ VIN ≤ 10V
2
10
Load Regulation (Note 2)
Thermal Regulation (Note 3)
Ripple Rejection (Note 3)
Quiescent Current
∆VOUT (IOUT
)
VIN = 5V, 0mA ≤ IOUT ≤ IOUT (MAX)
5
0.01
83
15
0.02
∆VOUT(Pwr) TA = 25°C, 20ms pulse
COUT = 100µF (Tantalum), IOUT = 8.5A, TA = 25°C
60
IQ
∆V
0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V
∆VOUT = 1%, IOUT = IOUT (MAX)
4
10
1.3
Dropout Voltage
1.1
9.2
0.25
0.3
0.003
Maximum Output Current
Temperature Stability (Note 3)
Long Term Stability (Note 3)
IOUT (MAX) VIN ≤ 7V
8.6
A
%
%
∆VOUT (T)
∆VOUT (t) TA = 125°C, 1000 hours
1
%
RMS Output Noise (% of VOUT) (Note 3) VOUT (RMS) TA = 25°C, 10Hz ≤ f ≤ 10kHz
Note 2. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to
heating effects are covered under the specification for thermal regulation.
Note 3. These parameters, although guaranteed, are not tested in production.
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APPLICATION NOTES
Minumum Load
(Larger resistor)
The LX8582A is an easy to use Low-Dropout (LDO) voltage
regulator. Ithasallofthestandardself-protectionfeaturesexpected
of a voltage regulator: short circuit protection, safe operating area
protection and automatic thermal shutdown if the device tempera-
ture rises above approximately 165°C.
Power Supply
IN
OUT
LX8582A
Full Load
(Smaller resistor)
ADJ
RDSON << RL
Use of an output capacitor is REQUIRED with the LX8582A.
Please see the table below for recommended minimum capacitor
values.
1 sec
10ms
Star Ground
The regulator offers a more tightly controlled reference voltage
tolerance and superior reference stability when measured against
the older pin-compatible regulator types that it replaces.
FIGURE 1 — DYNAMIC INPUT and OUTPUT TEST
OVERLOAD RECOVERY
Like almost all IC power regulators, the LX8582A is 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 LX8582A 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
operation 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.
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
pinbypassingisused,therequiredoutputcapacitorvalueincreases.
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.
Thetablebelowshowsrecommendedminimumcapacitancevalues
for stable operation.
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
casewheretheregulatorissupplyingregulatedvoltagetoaresistive
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
throughtheregulatortodevelopthedesignedoutputvoltageacross
theloadresistance. Iftheoutputresistorisshort-circuitedtoground,
theinput-to-outputvoltagedifferenceacrosstheregulatorsuddenly
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
permittheregulatortosupplytoitsoutputterminal. Whentheshort
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
bytheSOAcircuit,basedonthelargeinput-to-outputvoltageacross
theregulatoratthetimetheshortcircuitisremovedfromtheoutput.
RECOMMENDED CAPACITOR VALUES
INPUT
OUTPUT
ADJ
None
15µF
10µF
10µF
15µF Tantalum, 100µF Aluminum
47µF Tantalum, 220µF Aluminum
In order 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 generally 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.
ThecircuitshowninFigure1canbeusedtoobservethetransient
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 quickly compared in order to develop an optimum
solution.
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APPLICATION NOTES
OVERLOAD RECOVERY (continued)
If this limited current is not sufficient to develop the designed
voltage across the output resistor, the voltage will stabilize at some
lower value, and willnever reach the designed value. Under these
circumstances, it may be necessary to cycle the input voltage down
to zero in order to make the regulator output voltage return to
regulation.
LX8582A
OUT
IN
VIN
VOUT
ADJ
VREF
R1
R2
IADJ
50µA
RIPPLE REJECTION
R2
R1
VOUT = VREF 1 +
+ IADJ R2
Ripple rejection can be improved by connecting a capacitor
betweentheADJpinandground. Thevalueofthecapacitorshould
be chosen so that the impedance of the capacitor is equal in
magnitude to the resistance of R1 at the ripple frequency. The
capacitor value can be determined by using this equation:
FIGURE 2 — BASIC ADJUSTABLE REGULATOR
LOAD REGULATION
C = 1 / (6.28 F R1)
*
*
Because theLX8582A is a three-terminal device, it is not possible to
provide true remote load sensing. Load regulation will be limited
by the resistance of the wire connecting the regulator to the load.
The data sheet specification for load regulation is measured at the
bottom of the package. Negative side sensing is a true Kelvin
connection, with the bottom of the output divider returned to the
negative side of the load. Although it may not be immediately
obvious,bestloadregulationisobtainedwhenthetopoftheresistor
divider, (R1), is connected directly to the case of the regulator, not
to the load. This is illustrated in Figure 3. If R1 were connected to
the load, the effective resistance between the regulator and the load
would be:
R
where: C ≡ the value of the capacitor in Farads;
select an equal or larger standard value.
FR ≡ the ripple frequency in Hz
R1 ≡ the value of resistor R1 in ohms
At a ripple frequency of 120Hz, with R1 = 100Ω:
C = 1 / (6.28 120Hz 100Ω) = 13.3µF
*
*
The closest equal or larger standard value should be used, in this
case, 15µF.
When an ADJ pin bypass capacitor is used, output ripple
amplitude will be essentially independent of the output voltage. If
an ADJ pin bypass capacitor is not used, output ripple will be
proportional to the ratio of the output voltage to the reference
voltage:
R2+R1
R1
RPeff = RP
*
where: RP ≡ Actual parasitic line resistance.
M = VOUT/VREF
When the circuit is connected as shown in Figure 3, the parasitic
resistance appears as its actual value, rather than the higher RPeff.
where: M ≡ a multiplier for the ripple seen when the
ADJ pin is optimally bypassed.
VREF = 1.25V.
R
ParaPsitic
LX8582A
Line Resistance
For example, if VOUT = 2.5V the output ripple will be:
M = 2.5V/1.25V= 2
OUT
IN
VIN
ADJ
Connect
R1 to Case
of Regulator
Output ripple will be twice as bad as it would be if the ADJ pin
were to be bypassed to ground with a properly selected capacitor.
R1
R2
RL
OUTPUT VOLTAGE
Connect
R2
The LX8582A develops a 1.25V reference voltage between the output
and the adjust terminal (See Figure 2). By placing a resistor, R1,
between these two terminals, a constant current is caused to flow
through R1 and down through R2 to set the overall output voltage.
Normally this current is the specified minimum load current of 10mA.
BecauseIADJisverysmallandconstantwhencomparedwiththecurrent
through R1, it represents a small error and can usually be ignored.
to Load
FIGURE 3 — CONNECTIONS FOR BEST LOAD REGULATION
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APPLICATION NOTES
LOAD REGULATION (continued)
Even when the circuit is optimally configured, parasitic resistance
can be a significant source of error. A 100 mil (2.54 mm) wide PC
trace built from 1 oz. copper-clad circuit board material has a
parasitic resistance of about 5 milliohms per inch of its length at
roomtemperature. Ifa3-terminalregulatorusedtosupply2.50volts
is connected by 2 inches of this trace to a load which draws 5 amps
of current, a50 millivolt dropwill appearbetween theregulatorand
the load. Even when the regulator output voltage is precisely
2.50 volts, the load will only see 2.45 volts, which is a 2% error. It
is important to keep the connection between the regulator output
pin and the load as short as possible, and to use wide traces or
heavy-gauge wire.
can be used, as long as its added contribution to thermal resistance
is considered. Note that the case of all devices in this series is
electrically connected to the output.
Example
Given: VIN = 5V
VOUT = 2.8V, IOUT = 5.0A
Ambient Temp., TA = 50°C
RθJT = 2.7°C/W for TO-220
300 ft/min airflow available
Find: Proper Heat Sink to keep IC's junction
temperature below 125°C.**
The minimum specified output capacitance for the regulator
should be located near the reglator package. If several capacitors
are used in parallel to construct the power system output capaci-
tance, any capacitors beyond the minimum needed to meet the
specified requirements of the regulator should be located near the
sections of the load that require rapidly-changing amounts of
current. Placing capacitors near the sources of load transients will
help ensure that power system transient response is not impaired
by the effects of trace impedance.
To maintain good load regulation, wide traces should be used on
the input side of the regulator, especially between the input
capacitors and the regulator. Input capacitor ESR must be small
enoughthatthevoltageattheinputpindoesnotdropbelowVIN(MIN)
during transients.
Solution: The junction temperature is:
TJ = PD (RθJT + RθCS + RθSA) + TA
where: PD ≡ Dissipated power.
RθJT ≡ Thermal resistance from the junction to the
mounting tab of the package.
RθCS ≡ Thermal resistance through the interface
between the IC and the surface on which
it is mounted. (1.0°C/W at 6 in-lbs
mounting screw torque.)
RθSA
≡
Thermal resistance from the mounting surface
to ambient (thermal resistance of the heat sink).
TS ≡ Heat sink temperature.
TJ TC TS
TA
VIN (MIN) = VOUT + VDROPOUT (MAX)
Rq JT
RqCS
RqSA
where: VIN (MIN)
VOUT
≡ the lowest allowable instantaneous
voltage at the input pin.
≡ the designed output voltage for the
power supply system.
First, find the maximum allowable thermal resistance of the
heat sink:
TJ - TA
RθSA
=
- (RθJT + RθCS)
PD
VDROPOUT (MAX) ≡ the specified dropout voltage
for the installed regulator.
PD = (VIN(MAX) - VOUT) IOUT = (5.0V-2.8V) 5.0A
*
= 11.0W
THERMAL CONSIDERATIONS
125°C - 50°C
RθSA
=
- (2.7°C/W + 1.0°C/W)
The LX8582A regulator has internal power and thermal limiting
circuitry designed to protect the device under overload conditions.
For continuous normal load conditions, however, maximum junc-
tion temperature ratings must not be exceeded. It is important to
give careful consideration to all sources of thermal resistance from
junctiontoambient. Thisincludesjunctiontocase, casetoheatsink
interface, and heat sink thermal resistance itself.
Junction-to-case thermal resistance is specified from the IC
junction to the back surface of the case directly opposite the die.
This is the lowest resistance path for heat flow. Proper mounting
is required to ensure the best possible thermal flow from this area
of the package to the heat sink. Thermal compound at the case-to-
heat-sink interface is strongly recommended. If the case of the
device must be electrically isolated, a thermally conductive spacer
(5.0V-2.8V) 5.0A
*
= 3.1°C/W
Next,selectasuitableheatsink. Theselectedheatsinkmusthave
RθSA≤ 3.1°C/W. Thermalloyheatsink6296BhasRθSA =3.0°C/Wwith
300ft/min air flow.
Finally, verify that junction temperature remains within speci-
fication using the selected heat sink:
TJ = 11W (2.7°C/W + 1.0°C/W + 3.0°C/W) + 50°C = 124°C
** Although the device can operate up to 150°C junction, it is recom-
mended for long term reliability to keep the junction temperature
below 125°C whenever possible.
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TYPICAL APPLICATIONS
LX8582A
LX8582A
VIN
(Note A)
(Note A)
VIN
OUT
IN
VOUT**
5V
VOUT
OUT
IN
ADJ
R1
121W
R1
ADJ
10µF
121W
C2
100µF
C1*
1%
10µF
150µF
R2
1k
R2
C1
* C1 improves ripple rejection.
XC should be » R1 at ripple
frequency.
365W
10µF*
1%
* Needed if device is far from filter capacitors.
R2
R1
**VOUT = 1.25V 1 +
FIGURE 4 — IMPROVING RIPPLE REJECTION
FIGURE 5 — 1.2V - 8V ADJUSTABLE REGULATOR
LX8582A
VIN
(Note A)
OUT
IN
5V
ADJ
121W
1%
100µF
10µF
1k
TTL
Output
2N3904
365W
1%
1k
FIGURE 6 — 5V REGULATOR WITH SHUTDOWN
LX8582A-33
VIN
OUT
IN
3.3V
GND
10µF Tantalum
or 100µF Aluminum
Min. 15µF Tantalum or
100µF Aluminum capacitor.
May be increased without
limit. ESR must be less
than 50mW.
FIGURE 7 — FIXED 3.3V OUTPUT REGULATOR
Note A: VIN (MIN) = (Intended VOUT) + (VDROPOUT (MAX)
)
Cyrix is a registered trademark and 6x86 and 6x86L are trademarks of Cyrix Corporation. Pentium is a registered
trademark of Intel Corporation. Power PC is a trademark of International Business Machines Corporation.
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