LX8382-33 Datasheet PDF - Microsemi Corporation
| Part Number | LX8382-33 | |
| Description | 10 A LOW DROPOUT POSITIV E REGULATORS | |
| Manufacturers | 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 #: 8382
LX8382-xx/8382A-xx
10A LOW DROPOUT POSITIVE REGULATORS
PR O D U C T I O N D ATA S H E E T
DESCRIPTION
The LX8382/8382A series ICs are
positive regulators designed to provide
10A output current. All internal
circuitry is designed to operate down
to a 1V input-to-output differential, so
the LX8382/82A can operate with
greater efficiency than previously
available devices. The dropout voltage
for each product is fully specified as a
function of load current. Dropout is
guaranteed at a maximum of 1.4V
for the LX8382 and 1.2V for the
LX8382A at maximum output current,
decreasing at lower load currents.
Fixed versions are also available and
specified in the Available Options table
below. The LX8382/82A have 1%
initial voltage reference accuracy and
2% over line, load and temperature.
The LX8382/82A 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 LX8382/82A series quiescent
current flows into the load, thereby
increasing efficiency. This feature
contrasts with PNP regulators, where
up to 10% of the output current is
wasted as quiescent current. The
LX8382/82A-xxC is specified over the
commercial range of 0°C to +125°C.
PRODUCT HIGHLIGHT
3.3V, 10A RE G U L AT O R
VIN ≥ 4.75V
1500µF
6.3V
6MV1500GX
from Sanyo
IN LX8382-xx OUT
121Ω
ADJ 1%
178Ω
1%
3.1V at 10A
2x 330µF, 6.3V
Oscon SA type
from Sanyo
-or-
3x 1500µF, 6.3V
6MV1500GX
from Sanyo
KEY FEATURES
s THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT VOLTAGE
s GUARANTEED < 1.4V HEADROOM AT 10A
(LX8382)
s GUARANTEED < 1.2V HEADROOM AT 10A
(LX8382A)
s OUTPUT CURRENT OF 10A MINIMUM
p 0.015% LINE REGULATION
p 0.15% LOAD REGULATION
s EVALUATION BOARD AVAILABLE:
REQUEST LXE9001 EVALUATION KIT
A P P L I C AT I O N S
s PENTIUM® PROCESSOR APPLICATIONS
s POST REGULATORS FOR SWITCHING
POWER SUPPLIES
s BATTERY CHARGERS
s CONSTANT CURRENT REGULATORS
s CYRIX® 6x86TM
s AMD-K6TM
s HIGH-CURRENT MICROPROCESSORS
AVAILABLE O PTIONS PER PAR T #
Part #
Output
Voltage
LX8382/8382A-00
Adjustable
LX8382/8382A-33
3.3V
Other voltage options may be available —
Please contact factory for details.
Application of the LX8382 for a high-current microprocessor (e.g. AMD-K6)
with less than 130mV dynamic response to a 7.5A load transient.
Copyright © 1997
Rev. 1.0 8/97
PACKAGE ORDER INFORMATION
TA (°C)
Dropout
Voltage
P
Plastic TO-220
3-pin
V
Plastic TO-247
3-terminal
0 to 125
1.4V
1.2V
LX8382-xxCP
LX8382A-xxCP
LX8382-xxCV
LX8382A-xxCV
"xx" refers to output voltage, please see table above.
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1
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PRODUCT DATABOOK 1996/1997
10A LOW DROPOUT POSITIVE REGULATORS
PR O D U C T I O N D ATA S H E E T
LX8382-xx
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.
RIPPLE REJECTION
Ripple rejection can be improved by connecting a capacitor
between the ADJ pin and ground. The value of the capacitor should
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:
C = 1 / (6.28 * FR * R1)
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:
M = VOUT/VREF
where: M ≡ a multiplier for the ripple seen when the
ADJ pin is optimally bypassed.
VREF = 1.25V.
For example, if VOUT = 2.5V the output ripple will be:
M = 2.5V/1.25V= 2
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.
OUTPUT VOLTAGE
The LX8382/82A ICs develop 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.
Because IADJis very small and constant when compared with the current
through R1, it represents a small error and can usually be ignored.
LX8382/82A-xx
VIN IN OUT
ADJ
VREF
IADJ
50µA
VOUT = VREF
1
+
R2
R1
+ IADJ R2
VOUT
R1
R2
FIGURE 2 — BASIC ADJUSTABLE REGULATOR
LOAD REGULATION
Because the LX8382/82A regulators are three-terminal devices, 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, best load regulation is
obtained when the top of the resistor 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:
RPeff = RP *
R2+R1
R1
where: RP ≡ Actual parasitic line resistance.
When the circuit is connected as shown in Figure 3, the parasitic
resistance appears as its actual value, rather than the higher RPeff.
LX8382/82A-xx
ParRaPsitic
Line Resistance
VIN IN
OUT
ADJ Connect
R1 to Case
of Regulator
R1
R2 RL
Connect
R2
to Load
FIGURE 3 — CONNECTIONS FOR BEST LOAD REGULATION
Copyright © 1997
Rev. 1.0 8/97
5
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| Information | Total 7 Pages | |
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| Part Number | Description | MFRS |
| LX8382-33 | The function is 10 A LOW DROPOUT POSITIV E REGULATORS. Microsemi Corporation | |
| LX8382-33CP | The function is 10 A LOW DROPOUT POSITIV E REGULATORS. Microsemi Corporation | |
| LX8382-33CV | The function is 10 A LOW DROPOUT POSITIV E REGULATORS. Microsemi Corporation | |
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