LX8386-33IDT-TR [MICROSEMI]
Fixed Positive LDO Regulator;
| 型号： | LX8386-33IDT-TR |
| 厂家： | 
Microsemi |
| 描述： | Fixed Positive LDO Regulator 输出元件 调节器 |
| 文件： | 总11页 (文件大小：725K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LX8386x-xx
®
1.5A Low Dropout Positive Regulators
TM
PRODUCTION DATA SHEET
KEY FEATURES
DESCRIPTION
Three-Terminal Adjustable Or
Fixed Output
Guaranteed <1.3V Headroom at
1.5A (LX8686A/86B)
Output Current of 1.5A Minimum
Operates Down To 1V Dropout
0.015% Line Rgulation
0.1% Loan
Evaluativailable:
Request 1 Eation Kit
The LX8386/86A/86B Series ICs are
The LX8386/86A/86B series devices are
positive regulators designed to provide 1.5A pin-compatible with earlier 3-terminal
output current. These regulators yield regulators, such as the 117 series products.
higher efficiency than currently available While a 10µF output capacitor is required on
devices with all internal circuitry designed both input and output of these new devices,
to operate down to a 1V input-to-output this capacitor is generally included in most
differential. In each of these products, the regulator designs.
dropout voltage is fully specified as a
The LX8386/86A/86B series quiescent
function of load current. Dropout is current flows into the load, increasing
guaranteed at a maximum of 1.3V (8386A/ efficiency. This feature contrasts with PNP
86B) and 1.5V (8386) at maximum output regulators, where up to 10% of the output
current, decreasing at lower load currents.
current is wasted as quiescent current. The
PPLICATIONS
On-chip trimming adjusts the reference LX8386-xxI is specified over the full
voltage to 1% (0.8% for the 8386B) initial industrial temperature range of –25°C to
accuracy and 2% (1% for the 8386B) over +125°C and the LX8386/86A/86B is
High eLinear
egulat
Post Regulators For Switching
Per Supplies
line, load, and temperature.
specified over the commercial range of 0°C
to 125°C.
Bery Chargers
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.
nstant Current Regulators
ASIC & Low Voltage IC Supplies
Memory Cards
PRODUCT HIGHLIGHT
Graphics & Sound Chipsets
IN
OUT
5V
LX8386
+
OUTPUT
PART #
1%
*1500µF
6MV1500GX
Sanyo
VOLTAGE
ADJ
LX8386/86A/8B-00
LX8386/86A/86B-33
Adjustable
3.3V
1500µF
2x 6MV1500GX
Sanyo
20
1%
Table 1 - Available Options
PACKAGE ORDER INFO
Plastic TO-220
Plastic TO-263
3-Pin
Plastic TO-252
Max Dropout DT
P
DD
3-Pin
(D-Pak) 3-Pin
TA (°C)
Accuracy
Voltage
RoHS Compliant
RoHS Compliant
RoHS Compliant
Transition DC: 0532
Transition DC: 0543
LX8386-xxCP
LX8386A-xxCP
LX8386B-xxCP
LX8386-xxIP
Transition DC: 0535
2.0%
2.0%
1.0%
1.5V
1.3V
1.3V
1.5V
LX8386-xxCDT
LX8386A-xxCDT
LX8386B-xxCDT
LX8386-xxIDT
LX8386-xxCDD
LX8386A-xxCDD
LX8386B-xxCDD
LX8386-xxIDD
0 to 125
-25 to 125 2.0%
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8386-xxCP-TR)
Copyright © 2000
Rev. 2.0, 2005-11-02
Microsemi
Page 1
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX8386x-xx
®
1.5A Low Dropout Positive Regulators
TM
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
Power Dissipation................................................................................... Internally Limited
Input Voltage ................................................................................................................ 10V
Input to Output Voltage Differential............................................................................. 10V
Maximum Output Current............................................................................................ 1.5A
Operating Junction Temperature
Plastic (DT, DD, P Packages) ................................................................................150°C
Storage Temperature Range....................................................................... -65°C to 150 °C
Peak Package Solder Reflow Temp (40 seconds max. exposure).................260°C (+0, -5)
TAB is VOUT
3
VIN
2
1
VOUT
ADJ /
GND*
3-PIN)
iew)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
OUT
VIN
2
1
VOUT
THERMAL DATA
ADJ/
GND
*
Plastic TO-263 3-Pin
DD
DT PACKAGE (3-PIN)
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
THERMAL RESISTANCE-JUNCTION TO TAB, θJT
60°C/W
°C/W
(Top View)
TAB is VOUT
Plastic TO-220 3-Pin
P
3
VIN
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
THERMAL RESISTANCE-JUNCTION TO TAB, θJT
60°C/W
C/W
2
VOUT
ADJ /
GND*
1
Plastic TO-252 3-Pin
DT
P PACKAGE (3-PIN)
(Top View)
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
THERMAL RESISTANCE-JUNCTION TO TAB, θJ
C/W
2.7°C/W
RoHS Compliant 100% Matte Tin Lead Finish
*Pin 1 is GND for fixed voltage versions
Junction Temperature Calculation: TJ = TA + (PD x .
The θJA & θJT numbers are guidelines for the thermal prmance he device/pc-board
system. All of the above assume no ambiew.
LOCK DIAGRAM
VIN
Thermal
Limit Circuit
Bandgap
Circuit
Control
Circuit
Output
Circuit
VOUT
SOA
Protection
Circuit
ADJ or
GND*
Current
Limit Circuit
*Pin 1 is GND for fixed voltage versions
Copyright © 2000
Rev. 2.0, 2005-11-02
Microsemi
Page 2
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX8386x-xx
®
1.5A Low Dropout Positive Regulators
TM
PRODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature for the LX8386x-xxC with
0°C ≤ TA ≤ 125°C and the LX8386-xxI with -25°C ≤ TA ≤ 125°C except where otherwise noted. Test conditions: VIN -VOUT = 3V;
IOUT = 1.5A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient
temperature.
LX8386x-xx
Parameter
Symbol
Test Conditions
Units
Min
Max
LX8386-00 / 8386A-00 / 8386B-00 (ADJUSTABLE)
`
IOUT = 10mA, TA = 25°C
10mA < IOUT < IOUT(MAX), 1.5V < (VIN -VOUT),
IN < 10V, P < PMAX
1.23
1.225
40
1.
0
50
1.250
250
62
270
1.260
1.262
V
V
V
V
Reference Voltage
(Note 4)
LX8386/86A-00
V
VREF
IOUT = 10mA, TA = 25°C
LX8386B-00
10mA < IOUT < IOUT(MAX), 1.5V < (VIN -VOUT),
VIN < 10V, P < PMAX
Δ VREF
(VIN)
Δ VREF
Line Regulation (Note 2)
Load Regulation (Note 2)
Thermal Regulation
1.5V < (VIN -VOUT), VIN < 7V, IOUT = 10
VIN - VOUT = 3V, 10mA < 1.5A
TA = 25°C, 20ms pulse
0.015
0.15
0.01
83
0.2
0.4
%
%
(IOUT
)
ΔVOUT
(Pwr)
0.04
% / W
dB
V
V
OUT = 5V, f= 120Hz, C= 100µF talum,
IN = 6.5V, CADJ = 1.5A
Ripple Rejection (Note 3)
65
Adjust Pin Current
IADJ
55
0.2
1.2
1.1
2
100
5
µA
µA
V
Adjust Pin Current Change (Note 4)
ΔIADJ
10mA < IOUT < IN -VOUT), VIN<10V
ΔVREF = 1%, IOUT
ΔV1%, IOUT = 1.
< 10V
Dropout Voltage
LX8386-00
1.5
1.3
10
ΔV
LX8386A/86B-00
V
Minimum Load Current
IOUT(MIN)
IOUT(MAX)
ΔVT)
mA
A
Maximum Output Current
Temperature Stability (Note 3)
Long Term Stability (Note 3)
T) < 7
1.5
2.0
0.25
0.3
%
= 12, 1000 hours
1
%
RMS Output Noise (% of VOUT
(Note 3)
)
25°C, 10Hz < f < 10kHz
0.003
%
LX8386-33/ 8386A-33 (3.3V
`
VIN = 5V, IOUT = 0mA, TA = 25°C
4.75V < VIN < 10V, 0mA < IOUT < 1.5A, P < PMAX
VIN = 5V, IOUT = 0mA, TA = 25°C
4.75V < VIN < 10V, 0mA < IOUT < 1.5A, P < PMAX
4.75V < VIN < 7V
3.267
3.235
3.274
3.267
3.3
3.3
3.3
3.3
1
3.333
3.365
3.326
3.333
6
V
V
Output Voltage
(Note 4)
VOUT
V
V
mV
mV
ΔVOUT
(VIN)
Line Regulation (note 2
4.75V < VIN < 10V
2
10
ΔVOUT
Load Regulation (note 2)
Thermal Regulation
VIN = 5V, 0mA < IOUT < IOUT(MAX)
TA = 25°C, 20ms pulse
5
15
mV
(IOUT
)
ΔVOUT
(Pwr)
0.01
0.02
% / W
Ripple Rejection (note 3)
Quiescent Current
COUT = 100µF (Tantalum), IOUT = 1.5A
0mA < IOUT < IOUT(MAX), 4.75V < V < 10V
ΔVOUT = 1%, IOUT < IOUT(MAX)
60
83
4
dB
mA
V
IQ
10
1.5
1.3
1.2
1.1
Dropout Voltage
LX8386-33
LX8386A/86B-33
ΔV
ΔVOUT = 1%, IOUT < IOUT(MAX)
V
Copyright © 2000
Rev. 2.0, 2005-11-02
Microsemi
Page 3
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX8386x-xx
®
1.5A Low Dropout Positive Regulators
TM
PRODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS (CONTINUED)
Unless otherwise specified, the following specifications apply over the operating ambient temperature for the LX8386x-xxC with
0°C ≤ TA ≤ 125°C and the LX8386-xxI with -25°C ≤ TA ≤ 125°C except where otherwise noted. Test conditions: VIN -VOUT = 3V;
IOUT = 3A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient
temperature.
LX8386x-xx
Parameter
Symbol
Test Conditions
Units
Min
Max
LX8386-33 / 8386A-33 / 8386B-33 (3.3V FIXED)(CONTINUED)
`
Maximum Output Current
IOUT(MAX)
VIN < 7V
1.5
5
0.3
A
%
%
Temperature Stability (Note 3)
Long Term Stability (Note 3)
ΔVOUT(T)
ΔVOUT (t) TA=125°C, 1000 hours
1
RMS Output Noise (% of VOUT
(Note 3)
)
VOUT (RMS) TA=25°C, 10Hz < f < 10kHz
003
%
Note 2
Regulation is measured at constant junction temperature, using pse testing duty ycle. Changes in output
voltage due to heating effects are covered under the specification hermal ion.
These parameters, although guaranteed are not tested in production.
Note 3
Note 4
See Maximum Output Current Section
Copyright © 2000
Rev. 2.0, 2005-11-02
Microsemi
Page 4
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX8386x-xx
®
1.5A Low Dropout Positive Regulators
TM
PRODUCTION DATA SHEET
APPLICATION NOTES
Power
Supply
The LX8386/86A/86B 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.
Minimum Load
(Larger resistor)
IN
OUT
LX8386
Full Load
(Smaller
resistor)
ADJ
R
DSON << RL
Use of an output capacitor is REQUIRED with the
LX8386/86A/86B series. Please see the table below for
recommended minimum capacitor values.
s
Star Ground
1 sec
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.
Figure 1 – Dyanput and Output
OVERLOAD RECOVERY
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 (<400mΩ ESR) 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 (aluminum7µF
(tantalum) provide for all cases of bypassing the Apin. If a
ADJ pin bypass capacitor is not used, smaller out ca
values are adequate. The table below shows rended
minimum capacitance values for operation.
Like almost aregulat, the LX8386/86A/86B
regulators are with Safe Operating Area (SOA)
proon. The ircuit mits the regulator's maximum
outpuent to pssively wer values as the input-to-output
voltage ence iBy limiting the maximum output
current, the A circuit keeps the amount of power that is
dissipated in thulator itself within safe limits for all values of
utput ge within the operating range of the
he LX8386/86A/86B SOA protection system is
e able to supply some output current for all values of
ut voltage, up to the device breakdown voltage.
ome conditions, a correctly operating SOA circuit may
prent 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.
Minimum Cacitor
INPUT
10µF
10µF
OUTP
15µF Tantalum, 100µ
47µ20µF
ADJ
None
15µF
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.
To ensure ge from e power supply
system under raload conditions, designers
generally use s connected in parallel.
Such an arrangmize the effects of the
parasitic resistancnce (ESL) that are present
in all capacitors. Colutions 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 under-shoot, can be compared quickly in order to
develop an optimum solution.
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
Copyright © 2000
Rev. 2.0, 2005-11-02
Microsemi
Page 5
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX8386x-xx
®
1.5A Low Dropout Positive Regulators
TM
PRODUCTION DATA SHEET
APPLICATION NOTES (CONTINUED)
OVERLOAD RECOVERY (continued)
IN
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 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.
OUT
VOUT
VIN
LX8386
VREF
R1
R2
ADJ
IADJ
50µA
RIPPLE REJECTION
⎛
R2
⎞
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:
VOUT =VREF ⎜1
+ IAD
⎜
⎝
Figure 2 – Basic Adble Regulator
LOAD REGULAT
1
Because the A/86B regulators are three-terminal
dev, it is noto vide true remote load sensing.
Load ulation e limby the resistance of the wire
connecthe reguto load. The data sheet specification
for load rtion is measured at the bottom of the package.
Negative sidsing is a true Kelvin connection, with the
the odivider returned to the negative side of the
ugh it may not be immediately obvious, best load
obtained when the top of the resistor divider, (R1), is
rectly to the case of the regulator, not to the load.
strated in Figure 3. If R1 were connected to the load,
tctive resistance between the regulator and the load would
be:
C =
(
6.28× FR × R1
)
where:
C
≡
the value of the capacitor in Farads; select
an equal or larger standard value.
the ripple frequency in Hz
FR
R1
≡
≡
the value of resistor R1 in ohms
At a Ripple frequency of 120Hz, with R1= 100Ω:
1
C =
=13.3μF
(
6.28×120Hz×100Ω
)
The closest equal or larger standard value should used, in
this case, 15µF. When an ADJ pin bypass capaor is u
output ripple amplitude will be essentially indepenhe
output voltage. If an ADJ pin bypass capacitor is not , output
ripple will be proportional to the ratio of thut voltage to t
reference voltage:
R2 + R1
R1
⎛
⎜
⎞
⎟
RPeff = R ×
P
⎝
⎠
where:
RP
≡
Actual parasitic line resistance.
VO
When the circuit is connected as shown in Figure 3, the
parasitic resistance appears as its actual value, rather than the
M =
VREF
higher RPeff
.
where:
M
≡
or the seen when the
ally byed.
RP Parasitic Line
Resistance
OUT
VR
IN
LX8386
For example, t ripple will be:
VIN
Connect R1 to
Case of Regulator
= 2
R1
V
ADJ
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.
RL
Connect R2 to
Load
R2
OUTPUT VOLTAGE
The LX8386/86A/86B 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 IADJ is very small and
constant when compared with the current through R1, it
represents a small error and can usually be ignored.
Figure 3 – Connections for Best Load Regulation
Copyright © 2000
Rev. 2.0, 2005-11-02
Microsemi
Page 6
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX8386x-xx
®
1.5A Low Dropout Positive Regulators
TM
PRODUCTION DATA SHEET
APPLICATION NOTES (CONTINUED)
Example
LOAD REGULATION (continued)
Given: VIN
VOUT
=
=
=
=
=
5V
2.5V
1.5A
50°C
Even when the circuit is configured optimally, parasitic
resistance can be a significant source of error. A 20 mil. wide PC
trace built from 1 oz. copper-clad circuit board material has a
parasitic resistance of about 25 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
1.5 amps of current, a 75 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 2.43 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.
IOUT
TA
RθJT
2.7°C/W for TO-220
300 ft/min airflow available
Find:
Proper Heat Sink to keep on teperature
below 125°C.
Solution: The junction teure is:
TJ = PD (RθJT + RθR) + TA
The minimum specified output capacitance for the regulator
should be located near the regulator 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 drolow
VIN(MIN) during transients.
where: PD
RθJT
pated pr.
ermal resistance from the junction to
the mnting tab of the package.
Thel resistance through the
ace between the IC and the
surface on which it is mounted.
(1.0°C/W at 6 in-lbs mounting screw
torque).
Thermal resistance from the mounting
surface to ambient (thermal resistance
of the heat sink).
RθCS
SA
≡
≡
TS
Heat Sink Temperature.
TJ
TC
RθJT RθCS RθSA
First, find the maximum allowable thermal resistance of the
TS
TA
VΙΝ(ΜΙΝ) = VOUT + VDROPOUT(MAX)
where: VIN(MIN)
≡ the lowest allowable instantaneous
voltage at the i
heat sink:
VOUT
≡ the ded for the
power s
TJ − TA
RθSA
=
−
(
RθJT + RθCS
)
VDROPOUT(MAX) ≡ the specififor the
PD
ed regu
P = (VIN(MAX)− VOUT )IOUT = (5.0V −2.5V)×1.5A
D
THERMAL CO
The LX838have internal power and
thermal limitinrotect each device under
overload conditnormal load conditions,
however, maximuature ratings must not be
exceeded. It is impcareful consideration to all
sources of thermal resistfrom junction to ambient. This
includes junction to case, case to heat sink interface, and heat
sink thermal resistance itself.
P = 3.75W
D
125°C−50°C
(5.0V − 2.5V)*1.5A
RθSA =16.3°C/W
RθSA
=
−(2.7°C/W +1.0°C/W)
Next, select a suitable heat sink. The selected heat sink must
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 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.
have RθSA < 3.1°C/W. Thermalloy heatsink 6296B has RθSA
3.0°C/W with 3000ft/min air flow.
Finally, verify that junction temperature remains within speci-
fication using the selected heat sink:
=
TJ = 3.75W(2.7°C/W +1.0°C/W +12.0°C/W)+50°C
TJ =109°C
** 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.
Copyright © 2000
Rev. 2.0, 2005-11-02
Microsemi
Page 7
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX8386x-xx
®
1.5A Low Dropout Positive Regulators
TM
PRODUCTION DATA SHEET
TYPICAL APPLICATIONS
IN
OUT
(Note A)
VIN
VOUT**
LX8386
+
C1*
10µF
IN
OUT
R1
121Ω 1%
VIN
(Note A)
VOUT
C2
LX8386
100µF
ADJ
+
+
R1
121Ω 1%
10µF
ADJ
150µF
R2
1
C1
10µF*
+
R2
365Ω 1%
* C1 improves ripple rejection.
XC should be R1 at ripple
≈
frequency.
* Needed if device is acitors.
⎞
⎟
⎠
Figure 4 – Improving Ripple Rejection
* = 1.25
R1
Fe 5 – 1.8V Adjustable Regulator
IN
OUT
VIN
5V
LX8386
(note A)
+
121Ω
1%
10µF
IN
OUT
ADJ
3.3V
LX8386
VIN
Min. 15µF Tantalum or
100µF Aluminum capacitor.
May be increased without
limit. ESR must be less
than <400mΩ.
1k
1
10µF Tantalum or
100µF Aluminum
ADJ
2N3
TTL
Output
1k
Figure 7 – Fixed 3.3V Output Regulator
Figuth Shutdown
Note A: V
= (Intended VOUT )+ VDROPOUT(MAX)
IN(MIN)
Copyright © 2000
Rev. 2.0, 2005-11-02
Microsemi
Page 8
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX8386x-xx
®
1.5A Low Dropout Positive Regulators
TM
PRODUCTION DATA SHEET
PACKAGE DIMENSIONS
3-Pin Plastic TO-220
P
B
S
MILLIMETERS
INCHES
Dim
F
T
MIN
14.22
9.65
3.56
0.51
3.53
MAX
15.88
10.67
4.83
14
9
MIN
MAX
0.625
0.420
0.190
0.045
0.161
Q
A
B
C
D
F
40
20
0.139
U
A
C
G
2.54 BSC
0.100 BSC
1
2
3
R
H
J
K
6.35
1.14
73
0.250
0.045
0.580
0.050
H
1
0.012
0.500
0.045
.27
5.08 TYP
K
N
Q
0.200 TYP
D
.54
03
1.14
5.84
0.508
3.05
2.92
1.40
6.86
1.14
0.100
0.080
0.045
0.230
0.020
0.120
0.115
0.055
0.270
0.045
L
J
G
N
3-Pin Plastic TO-263
DD
I
A
MILLIMETERS
INCHES
Dim
MIN
10.03
8.51
4.19
1.14
0.330
1.19
2.41
2.29
–
MAX
10.67
9.17
4.59
1.40
0.51
1.34
2.66
2.79
1.65
0.25
15.87
MIN
0.395
0.335
0.165
0.045
0.013
0.047
0.095
0.090
–
MAX
0.420
0.361
0.181
0.055
0.020
0.053
0.104
0.110
0.065
0.010
0.625
A
B
C
D
E
F
G
H
I
B
K
M
N
H
E
F
G
J
0
0
K
M
N
14.60
0.575
7°
3°
7°
3°
0° -8°
J
Seating Plane
Note: Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006”) on any side. Lead dimension shall
not include solder coverage.
Copyright © 2000
Rev. 2.0, 2005-11-02
Microsemi
Page 9
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX8386x-xx
®
1.5A Low Dropout Positive Regulators
TM
PRODUCTION DATA SHEET
PACKAGE DIMENSIONS
3-Pin Plastic TO-252
DT
P
U
J
MILLIMETERS
INCHES
Dim
MIN
6.47
5.97
2.16
0.68
0.38
0.63
2
9.55
.20
MAX
6.73
6.23
2.42
4
0.8
2.42
1.10
5
.70
9.81
5.46
MIN
MAX
0.265
0.245
.095
0.037
0.025
0.035
0.095
0.043
0.045
0.106
0.386
0.215
A
B
C
D
E
F
G
H
I
85
27
0.015
0.025
.085
0.033
0.035
0.096
0.376
0.205
G
F
N
W
L
A
Q
O
V
0.23
K
L
Q
R
U
V
W
X
7.0°
45°
7.0°
0.51
0.51
4.19
0.76
0.48
0.51
0.77
0.77
4.45
1.02
0.74
0.77
0.020
0.020
0.165
0.030
0.019
0.020
0.030
0.030
0.175
0.040
0.029
0.030
M
H
R
D
45°
B
E
X
1.44
0
1.70
0.10
0.057
0
0.067
0.004
K
Copyright © 2000
Rev. 2.0, 2005-11-02
Microsemi
Page 10
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX8386x-xx
®
1.5A Low Dropout Positive Regulators
TM
PRODUCTION DATA SHEET
NOTES
PRODUCTION DATA – Information contained in this document is proprietary to
Microsemi and is current as of publication date. This document may not be modified in
any way without the express written consent of Microsemi. Product processing does not
necessarily include testing of all parameters. Microsemi reserves the right to change the
configuration and performance of the product and to discontinue product at any time.
Copyright © 2000
Rev. 2.0, 2005-11-02
Microsemi
Page 11
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
相关型号：
LX8386-33IPT
Fixed Positive LDO Regulator, 3.3V, 1.5V Dropout, PSFM3, PLASTIC, TO-220, 3 PIN
MICROSEMI
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