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PDF LM1086 Data sheet ( Hoja de datos )
| Número de pieza | LM1086 | |
| Descripción | 1.5A Low Dropout Positive Regulators | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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August 1999
LM1086
1.5A Low Dropout Positive Regulators
General Description
The LM1086 is a series of low dropout positive voltage regu-
lators with a maximum dropout of 1.5V at 1.5A of load cur-
rent. It has the same pin-out as National Semiconductor’s in-
dustry standard LM317.
The LM1086 is available in an adjustable version, which can
set the output voltage with only two external resistors. It is
also available in three fixed voltages: 2.85V, 3.3V and 5.0V.
The fixed versions integrate the adjust resistors.
The LM1086 circuit includes a zener trimmed bandgap refer-
ence, current limiting and thermal shutdown.
The LM1086 series is available in TO-220 and TO-263 pack-
ages. D-Pak is available upon special request; contact the
National Semiconductor sales representative in your area.
Features
n Available in 2.85V, 3.3V, 5V and Adjustable Versions
n Current Limiting and Thermal Protection
n Output Current
1.5A
n Line Regulation
0.015% (typical)
n Load Regulation
0.1% (typical)
Applications
n SCSI-2 Active Terminator
n High Efficiency Linear Regulators
n Battery Charger
n Post Regulation for Switching Supplies
n Constant Current Regulator
n Microprocessor Supply
Connection Diagrams
TO-220
TO-263
Top View
DS100948-2
DS100948-4
Top View
Note: D-Pak package also available. Contact National Semiconductor sales
representative in your area.
Basic Functional Diagram, Adjustable Version
© 1999 National Semiconductor Corporation DS100948
DS100948-65
www.national.com
1 page  
Electrical Characteristics (Continued)
Typicals and limits appearing in normal type apply for TJ = 25˚C. Limits appearing in Boldface type apply over the entire junc-
tion temperature range for operation.
Symbol
Parameter
Conditions
Min
(Note
6)
Typ
(Note
5)
Max
(Note
6)
Units
ILIMIT
Current Limit
Minimum Load
Current (Note 10)
Quiescent
Current
Thermal
Regulation
Ripple Rejection
Adjust Pin
Current
LM1086-ADJ
VIN−VOUT = 5V
VIN−VOUT = 25V
LM1086-2.85
VIN = 8V
LM1086-3.3
VIN = 8V
LM1086-5.0
VIN = 10V
LM1086-ADJ
VIN −VOUT = 25V
LM1086-2.85
VIN ≤ 18V
LM1086-3.3
VIN ≤ 18V
LM1086-5.0
VIN ≤ 20V
TA = 25˚C, 30ms Pulse
fRIPPLE = 120Hz, COUT = 25µF Tantalum, IOUT =
1.5A
LM1086-ADJ, CADJ = 25µF, (VIN−VO) = 3V
LM1086-2.85, VIN = 6V
LM1086-3.3, VIN= 6.3V
LM1086-5.0 VIN = 8V
LM1086
1.50
0.05
2.7
0.15
A
A
1.5 2.7
A
1.5 2.7
A
1.5 2.7
A
5.0
10.0
mA
5.0
10.0
mA
5.0
10.0
mA
5.0
10.0
mA
0.008 0.04 %/W
60 75
dB
60 72
dB
60 72
dB
60 68
dB
55 120 µA
Adjust Pin
Current Change
10mA ≤ IOUT ≤ IFULL LOAD, 1.5V ≤ (VIN−VOUT) ≤ 15V
0.2 5 µA
Temperature
Stability
Long Term
Stability
TA=125˚C, 1000Hrs
0.5 %
0.3 1.0 %
RMS Output
Noise
(% of VOUT)
Thermal
Resistance
Junction-to-Case
10Hz ≤ f≤ 10kHz
3-Lead TO-263: Control Section/Output Section
3-Lead TO-220: Control Section/Output Section
0.003
%
1.5/4.0 ˚C/W
1.5/4.0 ˚C/W
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 2: Power dissipation is kept in a safe range by current limiting circuitry. Refer to Overload Recovery in Application Notes.
Note 3: The maximum power dissipation is a function of TJ(max) , θJA, and TA. The maximum allowable power dissipation at any ambient temperature
is PD = (TJ(max)–T A)/θJA. All numbers apply for packages soldered directly into a PC board. Refer to Thermal Considerations in the Application Notes.
Note 4: For testing purposes, ESD was applied using human body model, 1.5kΩ in series with 100pF.
Note 5: Typical Values represent the most likely parametric norm.
Note 6: All limits are guaranteed by testing or statistical analysis.
Note 7: IFULL LOAD is defined in the current limit curves. The IFULL LOAD Curve defines current limit as a function of input-to-output voltage. Note that 15W power dis-
sipation for the LM1086 is only achievable over a limited range of input-to-output voltage.
Note 8: Load and line regulation are measured at constant junction temperature, and are guaranteed up to the maximum power dissipation of 15W. Power dissipa-
tion is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range.
Note 9: Dropout voltage is specified over the full output current range of the device.
Note 10: The minimum output current required to maintain regulation.
5 www.national.com
5 Page 
Typical Applications
5V to 3.3V, 1.5A Regulator
DS100948-49
Adjustable @ 5V
DS100948-50
DS100948-52
1.2V to 15V Adjustable Regulator
DS100948-53
5V Regulator with Shutdown
Battery Charger
DS100948-54
DS100948-55
Adjustable Fixed Regulator
DS100948-56
Regulator with Reference
DS100948-57
High Current Lamp Driver Protection
11 www.national.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LM1086.PDF ] | |
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