Datasheet LX8382A-33CV, LX8382A-33CP, LX8382A-00CV, LX8382A-00CP, LX8382-33CV Datasheet (Microsemi Corporation)
...Page 1
LIN DOC #:
A
8382
LX8382-xx/8382A-xx
THE INFINITE POWER OF INNOVATION
DESCRIPTION KEY FEATURES
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%
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.
initial voltage reference accuracy and
PRODUCT HIGHLIGHT
3.3V, 10A REGULATOR
V
≥
IN
6MV1500GX
4.75V
1500µF
6.3V
from Sanyo
IN
LX8382-xx
ADJ
OUT
121Ω
1%
178
1%
10A LOW D
ROPOUT POSITIVE REGULATORS
P RODUCTION DAT A SHEET
■ THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT VOLTAGE
■ GUARANTEED < 1.4V HEADROOM AT 10A
(LX8382)
■ GUARANTEED < 1.2V HEADROOM AT 10A
(LX8382A)
■ OUTPUT CURRENT OF 10A MINIMUM
p 0.015% LINE REGULATION
p 0.15% LOAD REGULATION
■ EVALUATION BOARD AVAILABLE:
REQUEST LXE9001 EVALUATION KIT
APPLICATIONS
■ PENTIUM
■ POST REGULATORS FOR SWITCHING
■ BATTERY CHARGERS
■ CONSTANT CURRENT REGULATORS
■ CYRIX
■ AMD-K6
■ HIGH-CURRENT MICROPROCESSORS
AVAILABLE OPTIONS PER PART #
3.1V at 10
2x 330µF, 6.3V
Oscon SA type
from Sanyo
-or3x 1500µF, 6.3V
Ω
6MV1500GX
from Sanyo
Part #
LX8382/8382A-00 Adjustable
LX8382/8382A-33 3.3V
Other voltage options may be available —
®
PROCESSOR APPLICATIONS
POWER SUPPLIES
®
TM
6x86
TM
Voltage
Please contact factory for details.
Output
Copyright © 1997
Rev. 1.0 8/97
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.
PACKAGE ORDER INFORMATION
T
(°C)
A
0 to 125
Dropout
Voltage
1.4V LX8382-xxCP LX8382-xxCV
1.2V LX8382A-xxCP LX8382A-xxCV
"xx" refers to output voltage, please see table above.
Plastic TO-220
P
3-pin
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
Plastic TO-247
V
3-terminal
1
Page 2
LX8382-xx
T
PRODUCT DATABOOK 1996/1997
10A LOW D
RODUCTION DATA SHEET
P
ROPOUT POSITIVE REGULATORS
ABSOLUTE MAXIMUM RATINGS (Note 1)
Power Dissipation .................................................................................. Internally Limited
Input Voltage................................................................................................................ 10V
Input to Output Voltage Differential ........................................................................... 10V
Maximum Output Current ........................................................................................... 10A
Operating Junction Temperature
Plastic (P & V Packages) ....................................................................................... 150°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C
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.
THERMAL DATA
P PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θθ
θ
θθ
JT
θθ
θ
θθ
JA
V PACKAGE:
= TA + (P
J
θθ
θ
θθ
JT
θθ
θ
θθ
JA
x θ
).
D
JA
THERMAL RESISTANCE-JUNCTION TO TAB,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
Junction Temperature Calculation: T
numbers are guidelines for the thermal performance of the device/pc-board system.
The θ
JA
All of the above assume no ambient airflow.
2.7°C/W
60°C/W
1.6°C/W
35°C/W
PACKAGE PIN OUTS
TAB IS V
OUT
3
2
1
P PACKAGE
* Pin 1 is GND for fixed voltage versions.
* Pin 1 is GND for fixed voltage versions.
(Top View)
TAB ON REVERSE SIDE IS V
3
2
1
V PACKAGE
(Top View)
OUT
V
IN
V
OUT
ADJ / GND*
V
IN
V
OUT
ADJ / GND*
V
IN
ADJ or
GND*
* This pin GND for fixed voltage versions.
Bias
Circuit
Thermal
Limit Circuit
BLOCK DIAGRAM
Bandgap
Circuit
Control
Circuit
Output
Circuit
SOA Protection
Circuit
Current
Limit Circuit
V
OU
2
Copyright © 1997
Rev. 1.0 8/97
Page 3
PRODUCT DATABOOK 1996/1997
LX8382-xx
10A LOW D
ROPOUT POSITIVE REGULATORS
P RODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8382/8382A-xxC with 0°C ≤ TA ≤ 125°C;
- V
V
temperature.)
= 3V; I
IN
OUT
LX8382-00 (Adjustable)
Reference Voltage (Note 4) V
Line Regulation (Note 2) ∆V
Load Regulation (Note 2) ∆V
Thermal Regulation
Ripple Rejection (Note 3) V
Adjust Pin Current I
Adjust Pin Current Change (Note 4) ∆ I
Dropout Voltage LX8382-00 ∆V ∆V
Minimum Load Current I
Maximum Output Current I
Temperature Stability (Note 3) ∆V
Long Term Stability (Note 3) ∆V
RMS Output Noise (% of V
= 10A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient
OUT
Parameter
Symbol
REFIOUT
10mA ≤ I
) 1.5V ≤ (V
REF (VIN
REFVOUT
)
(I
OUT
VIN - V
∆V
(Pwr)
TA = 25°C, 20ms pulse
OUT
C
ADJ
10mA ≤ I
ADJ
LX8382A-00 ∆V
OUT (MIN)VIN
OUT (MAX)
(T)
OUT
(t) TA = 125°C, 1000 hours
) (Note 3) V
OUT
OUT
OUT (RMS)TA
Test Conditions Units
= 10mA, TA = 25°C
≤ I
OUT
- V
IN
≥ V
, VIN - V
REF
= 3V, 10mA ≤ I
OUT
= 5V, f =120Hz, C
OUT
= 10µF, TA = 25°C, I
ADJ
≤ I
OUT
= 1%, I
REF
REF
= 1%, I
OUT
OUT
≤ 10V
(VIN - V
OUT
) ≤ 7V
= 25°C, 10Hz ≤ f ≤ 10kHz
OUT (MAX)
), V
≤ 7V
OUT
IN
= 3V, 10mA ≤ I
OUT
OUT (MAX)
= 10A
= 10A
, 1.5V ≤ (V
OUT
OUT
, 1.5V ≤ (V
- V
), V
OUT
≤ 10A, T
OUT
≤ 10V, P ≤ P
IN
= 25°C
A
IN
≤ 10A
= 100µf Tantalum, VIN = 6.5V
= 10A
OUT
- V
), V
OUT
≤ 10V
IN
IN
MAX
LX8382-00
Min. Typ. Max.
1.238 1.250 1.262 V
1.225 1.250 1.270 V
0.015 0.2 %
0.15 0.4 %
0.3 0.5 %
0.01 0.02 %/W
65 83 dB
55 100 µA
0.2 5 µA
1.2 1.4 V
1.1 1.2 V
210mA
10 12 A
0.25 %
0.3 1 %
0.003 %
LX8382-33 (3.3V Fixed)
Parameter
Output Voltage (Note 4) V
Line Regulation (Note 2) ∆V
Load Regulation (Note 2)
Thermal Regulation
Ripple Rejection (Note 3) C
Quiescent Current I
Dropout Voltage LX8382-33 ∆V ∆V
LX8382A-33 ∆V
Maximum Output Current I
Temperature Stability (Note 3) ∆V
Long Term Stability (Note 3) ∆V
RMS Output Noise (% of V
) (Note 3) V
OUT
Symbol
OUTVIN
OUT (VIN
∆V
OUT(IOUT
∆V
OUT
OUT (MAX)VIN
OUT
OUT
OUT (RMS)TA
= 5V, I
OUT
4.75V ≤ VIN ≤ 10V, 0mA ≤ I
) 4.75V ≤ V
)
V
(Pwr)
TA = 25°C, 20ms pulse
0mA ≤ I
Q
IN
= 5V, 0mA ≤ I
IN
= 100µF (Tantalum), I
OUT
OUT
= 1%, I
OUT
= 1%, I
OUT
≤ 7V
(T)
(t) TA = 125°C, 1000 hours
= 25°C, 10Hz ≤ f ≤ 10kHz
Test Conditions Units
= 0mA, TA = 25°C
≤ 7V
≤ I
OUT
OUT (MAX)
≤ I
, 4.75V ≤ VIN ≤ 10V
OUT (MAX)
≤ I
OUT
OUT (MAX)
≤ I
OUT
OUT (MAX)
≤ 10A, P ≤ P
OUT
= 10A
OUT
, V
≤ 7V
IN
, V
≤ 7V
IN
MAX
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.
Note 4. See Maximum Output Current Section above.
LX8382-33
Min. Typ. Max.
3.267 3.3 3.333 V
3.235 3.3 3.365 V
16mV
515mV
0.01 0.02 % / W
60 83 dB
410mA
1.4 V
1.2 V
10 12 A
0.25 1 %
0.3 %
0.003 %
Copyright © 1997
Rev. 1.0 8/97
3
Page 4
LX8382-xx
PRODUCT DATABOOK 1996/1997
10A LOW D
RODUCTION DATA SHEET
P
ROPOUT POSITIVE REGULATORS
APPLICATION NOTES
The LX8382/8382A series ICs are easy to use Low-Dropout (LDO)
voltage regulators. They have all of the standard self-protection
features expected of voltage regulators: 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 LX8382/82A
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 compensation 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 OUTPUT ADJ
10µF 15µF Tantalum, 100µF Aluminum None
10µF 47µF Tantalum, 220µF Aluminum 15µF
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.
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 undershoot, can be quickly compared in order to
develop an optimum solution.
Minumum Load
Power Supply
LX8382-xx
IN
/82A-xx
ADJ
FIGURE 1 — DYNAMIC INPUT and OUTPUT TEST
OUT
Star Ground
(Larger resistor)
Full Load
(Smaller resistor)
R
<< R
DSON
1 sec
10ms
OVERLOAD RECOVERY
Like almost all IC power regulators, the LX8382 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 LX8382 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.
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-tooutput 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.
L
4
Copyright © 1997
Rev. 1.0 8/97
Page 5
PRODUCT DATABOOK 1996/1997
LX8382/82A-xx
OUT
IN
ADJ
V
IN
R1
R2
R
L
R
P
Parasitic
Line Resistance
Connect
R1 to Case
of Regulator
Connect
R2
to Load
LX8382-xx
10A LOW D
ROPOUT POSITIVE REGULATORS
P RODUCTION DATA SHEET
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 will never 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 * F
where: C ≡ the value of the capacitor in Farads;
F
R1 ≡ the value of resistor R1 in ohms
At a ripple frequency of 120Hz, with R1 = 100Ω:
C = 1 / (6.28 * 120Hz
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 = V
OUT/VREF
where: M ≡ a multiplier for the ripple seen when the
V
For example, if V
M = 2.5V/1.25V= 2
* R1)
R
select an equal or larger standard value.
≡ the ripple frequency in Hz
R
100Ω) = 13.3µF
*
ADJ pin is optimally bypassed.
= 1.25V.
REF
= 2.5V the output ripple will be:
OUT
LX8382/82A-xx
ADJ
OUT
V
OUT
V
R1
REF
V
IN
IN
I
ADJ
50µA
V
= V
OUT
REF
FIGURE 2 — BASIC ADJUSTABLE REGULATOR
R2
1 + + I
R1
ADJ
R2
R2
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:
R2+R1
R
= RP
Peff
where: R
*
R1
≡ Actual parasitic line resistance.
P
When the circuit is connected as shown in Figure 3, the parasitic
resistance appears as its actual value, rather than the higher R
Peff
.
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 I
through R1, it represents a small error and can usually be ignored.
Copyright © 1997
Rev. 1.0 8/97
is very small and constant when compared with the current
ADJ
FIGURE 3 — CONNECTIONS FOR BEST LOAD REGULATION
5
Page 6
LX8382-xx
T
J
T
C
T
S
T
A
R
θ
JT
R
θ
CS
R
θ
SA
PRODUCT DATABOOK 1996/1997
10A LOW D
RODUCTION DATA SHEET
P
ROPOUT POSITIVE REGULATORS
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
room temperature. If a 3-terminal regulator used to supply 2.50 volts
is connected by 2 inches of this trace to a load which draws 5 amps
of current, a 50 millivolt drop will appear between the regulator and
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.
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 capacitance, 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
enough that the voltage at the input pin does not drop below V
during transients.
IN (MIN)
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: V
= 5V
IN
V
= 2.8V, I
OUT
Ambient Temp., T
R
= 2.7°C/W for TO-220
θJT
300 ft/min airflow available
OUT
= 5.0A
= 50°C
A
Find: Proper Heat Sink to keep IC's junction
temperature below 125°C.**
Solution: The junction temperature is:
where: P
= PD (R
T
J
D
R
θJT
R
θCS
+ R
+ R
θJT
θCS
θSA
) + T
A
≡ Dissipated power.
≡ Thermal resistance from the junction to the
mounting tab of the package.
≡ 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.)
R
≡
Thermal resistance from the mounting surface
θSA
to ambient (thermal resistance of the heat sink).
T
≡ Heat sink temperature.
S
V
= V
IN (MIN)
where: V
+ V
OUT
IN (MIN)
V
OUT
V
DROPOUT (MAX)
DROPOUT (MAX)
≡ the lowest allowable instantaneous
voltage at the input pin.
≡ the designed output voltage for the
power supply system.
≡ the specified dropout voltage
for the installed regulator.
THERMAL CONSIDERATIONS
The LX8382 regulators have internal power and thermal limiting
circuitry designed to protect each device under overload conditions.
For continuous normal load conditions, however, maximum junction temperature ratings must not be exceeded. It is important to
give careful consideration to all sources of thermal resistance from
junction to ambient. This includes junction to case, case to heat sink
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-toheat-sink interface is strongly recommended. If the case of the
device must be electrically isolated, a thermally conductive spacer
First, find the maximum allowable thermal resistance of the
heat sink:
TJ - T
P
D
IN(MAX)
A
- V
θJT
OUT
+ R
) I
125°C - 50°C
(5.0V-2.8V) * 5.0A
)
θCS
= (5.0V-2.8V) * 5.0A
OUT
= 11.0W
= - (R
R
θSA
=(V
P
D
= - (2.7°C/W + 1.0°C/W)
R
θSA
= 3.1°C/W
Next, select a suitable heat sink. The selected heat sink must have
R
≤ 3.1°C/W. Thermalloy heatsink 6296B has R
θSA
300ft/min air flow.
= 3.0°C/W with
θSA
Finally, verify that junction temperature remains within speci-
fication using the selected heat sink:
= 11W (2.7°C/W + 1.0°C/W + 3.0°C/W) + 50°C = 124°C
T
J
**
Although the device can operate up to 150°C junction, it is recommended for long term reliability to keep the junction temperature
below 125°C whenever possible.
6
Copyright © 1997
Rev. 1.0 8/97
Page 7
PRODUCT DATABOOK 1996/1997
LX8382/82A-xx
OUT
IN
ADJ
V
OUT
**
V
IN
R1
121Ω
R2
1k
C1*
10µF
* Needed if device is far from filter capacitors.
** V
OUT
= 1.25V 1 +
C2
100µF
R2
R1
(Note A)
O
LX8382-xx
(Note A)
V
IN
10µF
LX8382/82A-xx
IN
ADJ
* C1 improves ripple rejection.
X
should be ≈ R1 at ripple
C
frequency.
10A LOW D
P RODUCTION DATA SHEET
OUT
365Ω
R2
1%
V
IN
(Note A)
R1
121
1%
ROPOUT POSITIVE REGULATORS
TYPICAL APPLICATIONS
5V
V
OUT
Ω
150µF
C1
10µF*
FIGURE 5 — 1.2V - 8V ADJUSTABLE REGULATORFIGURE 4 — IMPROVING RIPPLE REJECTION
LX8382/82A-xx
ADJ
OUT
121Ω
1%
IN
10µF
5V
100µF
Note A: V
= (Intended V
IN (MIN)
Copyright © 1997
Rev. 1.0 8/97
TTL
utput
1k
FIGURE 6 — 5V REGULATOR WITH SHUTDOWN
1k
2N3904
365
1%
LX8382/82A-33
V
IN
10µF Tantalum
IN
GND
OUT
or 100µF Aluminum
FIGURE 7 — FIXED 3.3V OUTPUT REGULATOR
OUT
) + (V
DROPOUT (MAX)
)
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PRODUCTION DATA - Information contained in this document is proprietary to Linfinity, and is current as of publication date. This document
may not be modified in any way without the express written consent of Linfinity. Product processing does not necessarily include testing of
all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.
Pentium is a registered trademark of Intel Corporation.
Ω
3.3V
Min. 15µF Tantalum or
100µF Aluminum capacitor.
May be increased without
limit. ESR must be less
than 50mΩ.
7
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