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LA8385 の電気的特性と機能

LA8385のメーカーはMicrosemiです、この部品の機能は「3A Low Dropout Positive Regulators」です。


製品の詳細 ( Datasheet PDF )

部品番号 LA8385
部品説明 3A Low Dropout Positive Regulators
メーカ Microsemi
ロゴ Microsemi ロゴ 




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LA8385 Datasheet, LA8385 PDF,ピン配置, 機能
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 # : 8385
LX8385-xx/8385A-xx/8385B-xx
3A LOW DROPOUT POSITIVE REGULATORS
P R O D U C T I O N D ATA S H E E T
DESCRIPTION
The LX8385/8385A/8385B series ICs are
positive regulators designed to provide
3A output current. Each regulator yields
higher efficiency than currently available
devices with all internal circuitry designed
to operate down to a 1V input-to-output-
differential. In these products, the drop-
out voltage is fully specified as a function
of load current. The LX8385's dropout is
guaranteed at a maximum of 1.5V at maxi-
mum output current, decreasing at lower
load currents. The LX8385A/85B have a
maximum dropout voltage of 1.3V.
The LX8385B offers a tighter voltage
reference tolerance: ±1.0% over line, load
and temperature, with 0.8% initial accu-
racy. The LX8385/85A have 1.0% initial
accuracy, with 2% over line, load and tem-
perature.
The LX8385/85A/85B series devices are
pin-compatible with earlier 3-terminal
regulators, such as 117 series products.
While a 10µF output capacitor is required
on both input and output of these new
devices, this is generally included in most
regulator designs.
The quiescent current of the LX8385/
85A/85B series products flows into the
load, increasing efficiency. This feature
contrasts with PNP regulator designs,
where up to 10% of the output current is
wasted as quiescent current.
The LX8385-xxI is rated for -25°C to
+125°C applications, and the LX8385-xxC
/8385B-xxC is rated for 0°C to +125°C
applications.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
3.3V, 3 A RE G U L AT O R
5V
1500µF, 6.3V
6MV1500GX
IN LX8385 OUT
121
ADJ 1%
200
1%
3.3V at 3A
2x 1500µF, 6.3V
6MV1500GX
from Sanyo
KEY FEATURES
s Three-Terminal Adjustable Or Fixed
Output Voltage
s Guaranteed 1% Voltage Reference
Accuracy Over Line, Load And
Temperature (LX8385B)
s Guaranteed < 1.5V Headroom At 3A
(LX8385)
s Guaranteed < 1.3V Headroom At 3A
(LX8385A/8385B)
s Output Current Of 3A Minimum
p 0.015% Line Regulation
p 0.1% Load Regulation
A P P L I C AT I O N S
s High Efficiency Linear Regulators
s Post Regulators For Switching
Power Supplies
s Battery Chargers
s Constant Current Regulators
s Graphics & Standard Supplies
s Processor I/O Supply
s Low Voltage Memory & Chipset Supplies
AVAILABLE O PTIONS PER PAR T #
Part #
Output
Voltage
LX8385/85A/85B-00 Adjustable
LX8385/85A/85B-33
3.3V
LX8385/85A/85B-05
5.0V
Other voltage options may be available —
Please contact factory for details.
Copyright © 1999
Rev. 2.0a 10/00
PACKAGE ORDER INFORMATION*
TA (°C)
Dropout
Voltage
P
Plastic TO-220
3-pin
DD
Plastic
3-pin
TO-263
1.5V
LX8385-xxCP
LX8385-xxCD
0 to 125
1.3V
1.3V
LX8385A-xxCP
LX8385B-xxCP
LX8385A-xxCD
LX8385B-xxCD
-25 to 125
1.5V
LX8385-xxIP
LX8385-xxID
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number
(i.e. LX8385-00CDDT). "xx" refers to output voltage, please see table above.
* Consult factory for availability of TO-3 Metal Can.
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1

1 Page





LA8385 pdf, ピン配列
PRODUCT DATABOOK 1996/1997
LX8385-xx/8385A-xx/8385B-xx
3A LOW DROPOUT POSITIVE REGULATORS
P R O D U C T I O N D ATA S H E E T
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8385-xxC/85A/85B-xxC with 0°C TA
125°C and the LX8385-xxI with -25°C TA 125°C; VIN - VOUT = 3V; IOUT = 3A. Low duty cycle pulse testing techniques are used which maintains
junction and case temperatures equal to the ambient temperature.)
LX8385-00/85A/85B-00 (Adjustable)
Parameter
Symbol
Test Conditions
LX8385/85A/85B-00 Units
Min. Typ. Max.
Reference Voltage LX8385-00
VREF IOUT = 10mA, TA = 25°C
(Note 4)
10mA IOUT IOUT ,(MAX) 1.5V (VIN - VOUT), VIN 10V, P PMAX
LX8385A/85B-00
IOUT = 10mA, TA = 25°C
10mA IOUT IOUT ,(MAX) 1.5V (VIN - VOUT), VIN 10V, P PMAX
Line Regulation (Note 2)
VREF (VIN) 1.5V (VIN - VOUT) 7V, IOUT = 10mA
Load Regulation (Note 2)
VREF (IOUT) VIN - VOUT = 3V, 10mA IOUT 3A
Thermal Regulation
VOUT(Pwr) TA = 25°C, 20ms pulse
Ripple Rejection (Note 3)
VOUT = 5V, f =120Hz, COUT = 100µf Tantalum, VIN = 6.5V
CADJ = 10µF, IOUT = 3A
Adjust Pin Current
IADJ
Adjust Pin Current Change (Note 4)
IADJ 10mA IOUT IOUT (MAX) , 1.5V (VIN - VOUT), VIN 10V
Dropout Voltage
LX8385-00
V VREF = 1%, IOUT = 3A
LX8385A/85B-00
VREF = 1%, IOUT = 3A
Minimum Load Current
IOUT (MIN) VIN 10V
Maximum Output Current
IOUT (MAX) (VIN - VOUT) 7V, VIN 10V
Temperature Stability (Note 3)
VOUT (T)
Long Term Stability (Note 3)
VOUT (t) TA = 125°C, 1000 hours
RMS Output Noise (% of VOUT) (Note 3) VOUT (RMS) TA = 25°C, 10Hz f 10kHz
1.238
1.225
1.240
1.238
65
1.250
1.250
1.250
1.250
0.015
0.2
0.01
83
1.262
1.270
1.260
1.262
0.2
0.5
0.04
V
V
V
V
%
%
%/W
dB
55 100 µA
0.2 5 µA
1.2 1.5
V
1.1 1.3
V
2 10 mA
3 3.5
A
0.25 %
0.3 1
%
0.003
%
LX8385-33/85A-33/85B-33 (3.3V Fixed)
Parameter
Symbol
Test Conditions
LX8385/85A/85B-33 Units
Min. Typ. Max.
Output Voltage
LX8385-33
VOUT VIN = 5V, IOUT = 0mA, TA = 25°C
(Note 4)
4.75V VIN 10V, 0mA IOUT 3A, P PMAX
LX8385A/85B-33
VIN = 5V, IOUT = 0mA, TA = 25°C
4.75V VIN 10V, 0mA IOUT 3A, P PMAX
Line Regulation (Note 2)
VOUT
(VIN )
4.75V VIN 7V
4.75V VIN 10V
Load Regulation (Note 2)
VOUT (IOUT) VIN = 5V, 0mA IOUT IOUT (MAX)
Thermal Regulation
VOUT(Pwr) TA = 25°C, 20ms pulse
Ripple Rejection (Note 3)
COUT = 100µF (Tantalum), IOUT = 3A
Quiescent Current
IQ 0mA IOUT IOUT (MAX) , 4.75V VIN 10V
Dropout Voltage
LX8385-33
V VOUT = 1%, IOUT IOUT (MAX)
LX8385A/85B-33
VOUT = 1%, IOUT IOUT (MAX)
Maximum Output Current
IOUT (MAX) VIN 7V
Temperature Stability (Note 3)
VOUT (T)
Long Term Stability (Note 3)
VOUT (t) TA = 125°C, 1000 hours
RMS Output Noise (% of VOUT) (Note 3) VOUT (RMS) TA = 25°C, 10Hz f 10kHz
3.267
3.235
3.274
3.267
60
3
3.3
3.3
3.3
3.3
1
2
5
0.01
83
4
1.2
1.1
3.5
0.25
0.3
0.003
3.333
3.365
3.326
3.333
6
10
15
0.02
10
1.5
1.3
1
V
V
V
V
mV
mV
mV
%/W
dB
mA
V
V
A
%
%
%
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.
Copyright © 1999
Rev. 2.0a 10/00
3


3Pages


LA8385 電子部品, 半導体
PRODUCT DATABOOK 1996/1997
LX8385-xx/8385A-xx/8385B-xx
3A LOW DROPOUT POSITIVE REGULATORS
PRODUCTION 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 * 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 = 100:
C = 1 / (6.28 * 120Hz * 100) = 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 LX8385/85A/85B 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.
LX8385/85A/85B
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 LX8385/85A/85B 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.
LX8385/85A/85B
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
6 Copyright © 1999
Rev. 2.0a 10/00

6 Page



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部品番号部品説明メーカ
LA8385

3A Low Dropout Positive Regulators

Microsemi
Microsemi
LA8385

3A Low Dropout Positive Regulators

Microsemi
Microsemi


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