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PDF LT1086MK Data sheet ( Hoja de datos )
| Número de pieza | LT1086MK | |
| Descripción | 1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V/ 3.3V/ 3.6V/ 5V/ 12V | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1086 Series
1.5A Low Dropout Positive
Regulators Adjustable and
Fixed 2.85V, 3.3V, 3.6V, 5V, 12V
FEATURES
s 3-Terminal Adjustable or Fixed
2.85V, 3.3V, 3.6V, 5V, 12V
s Output Current of 1.5A, (0.5A for LT1086H)
s Operates Down to 1V Dropout
s Guaranteed Dropout Voltage at Multiple Current Levels
s Line Regulation: 0.015%
s Load Regulation: 0.1%
s 100% Thermal Limit Functional Test
U
APPLICATIONS
s SCSI-2 Active Terminator
s High Efficiency Linear Regulators
s Post Regulators for Switching Supplies
s Constant Current Regulators
s Battery Chargers
s Microprocessor Supply
DESCRIPTION
The LT ®1086 is designed to provide 1.5A with higher
efficiency than currently available devices. All internal
circuitry is designed to operate down to 1V input-to-
output differential and the dropout voltage is fully speci-
fied as a function of load current. Dropout is guaranteed at
a maximum of 1.5V at maximum output current, decreas-
ing at lower load currents. On-chip trimming adjusts the
reference/ouput voltage to 1%. Current limit is also
trimmed, minimizing the stress on both the regulator and
power source circuitry under overload conditions.
The LT1086 is pin compatible with older 3-terminal adjust-
able regulators. A 10µF output capacitor is required on
these new devices; however, this is usually included in
most regulator designs.
A 2.85V output version is offered for SCSI-2 active termi-
nation. For surface mount applications see the LT1117-
2.85 data sheet. For high current or lower dropout require-
ments see the LT1123-2.85 data sheet.
Unlike PNP regulators, where up to 10% of the output
current is wasted as quiescent current, the LT1086 quies-
cent current flows into the load, increasing efficiency.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
5V to 3.3V Regulator
VIN ≥ 4.75V
IN
10µF*
TANTALUM
LT1086-3.3 OUT
GND
3.3V AT 1.5A
10µF
TANTALUM
LT1086 • TA01
*MAY BE OMITTED IF INPUT SUPPLY IS WELL
BYPASSED WITHIN 2" OF THE LT1086
LT1086 Dropout Voltage
2
INDICATES GUARANTEED TEST POINT
–55°C ≤ TJ ≤ 150°C
0°C ≤ TJ ≤ 125°C
1
TJ = – 55°C
TJ = 25°C
TJ = 150°C
0
0 0.5 1
1.5
OUTPUT CURRENT (A)
LT1086 • TA02
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LT1086 Series
LT1086 Short-Circuit Current
2.5
TJ = 150°C
2.0
TJ = 25°C
TJ = –55°C
1.5
1.0
0.5
0
0
GUARANTEED
OUTPUT CURRENT
5 10 15 20 25
INPUT/OUTPUT DIFFERENTIAL (V)
30
LT1086 • TPC01
LT1086 Load Regulation
0.10
∆I = 1.5A
0.05
0
–0.05
–0.10
–0.15
–0.20
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1086 • TPC02
Temperature Stability
2
1
0
–1
–2
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1086 • TPC04
LT1086 Ripple Rejection
100
90 VRIPPLE ≤ 3VP-P VRIPPLE ≤ 0.5VP-P
80
70 (VIN – VOUT) ≥ 3V
60
(VIN – VOUT) ≥ VDROPOUT
50
40
30
20 CADJ = 200µF AT FREQUENCIES < 60Hz
10
CADJ = 25µF AT FREQUENCIES > 60Hz
IOUT = 1.5A
0
10 100 1k 10k
FREQUENCY (Hz)
100k
LT1086 • TPC07
Adjust Pin Current
100
90
80
70
60
50
40
30
20
10
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1086 • TPC05
LT1086 Ripple Rejection
vs Current
100
90
fR = 120Hz
VRIPPLE ≤ 3VP-P
80
70 fR = 20kHz
60 VRIPPLE ≤ 0.5VP-P
50
40
30
20 VOUT = 5V
10
CADJ = 25µF
COUT = 25µF
0
0 0.25 0.5 0.75 1.0
OUTPUT CURRENT (A)
1.25
1.5
LT1086 • TPC08
Minimum Operating Current
(Adjustable Device)
10
9
8
7
6
5 TJ = 150°C
TJ = 25°C
4 TJ = –55°C
3
2
1
0
0 5 10 15 20 25 30 35
INPUT/OUTPUT DIFFERENTIAL (V)
LT1086 Maximum Power
Dissipation*
20
LT1086 • TPC03
LT1086MK
15
LT1086CT
10
LT1086CK
5
0
50 60 70 80 90 100 110 120 130 140 150
CASE TEMPERATURE (°C)
*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
LT1086 • TPC06
LT1086-5 Ripple Rejection
80
VRIPPLE ≤ 3VP-P VRIPPLE ≤ 0.5VP-P
70
(VIN – VOUT) ≥ 3V
60
50
(VIN – VOUT) ≥ VDROPOUT
40
30
20
10
IOUT = 1.5A
0
10 100 1k 10k
FREQUENCY (Hz)
100k
LT1086 • TPC09
5
5 Page 
LT1086 Series
APPLICATIONS INFORMATION
In both cases the junction temperature is below the
maximum rating for the respective sections, ensuring
reliable operation.
Junction-to-case thermal resistance for the K and T pack-
ages is specified from the IC junction to the bottom of the
case directly below the die. This is the lowest resistance
path for heat flow. While this is also the lowest resistance
path for the H package, most available heat sinks for this
package are of the clip-on type that attach to the cap of the
package. The data sheet specification for thermal resis-
tance for the H package is therefore written to reflect this.
In all cases proper mounting is required to ensure the best
possible heat flow from the die to the heat sink. Thermal
compound at the case-to-heat sink interface is strongly
recommended. In the case of the H package, mounting the
device so that heat can flow out the bottom of the case will
significantly lower thermal resistance (≈ a factor of 2). 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.
TYPICAL APPLICATIONS
5V, 1.5A Regulator
VIN ≥ 6.5V
IN
+
10µF
LT1086 OUT
ADJ
*REQUIRED FOR STABILITY
5V AT 1.5A
121Ω
1% +
10µF*
TANTALUM
365Ω
1%
LT1086 • AI02
SCSI-2 Active Termination
TERMPWR
1N5817
4.25V
+
TO 5.25V
IN LT1086-2.85 OUT
10µF
TANTALUM
GND
+
10µF
TANTALUM
0.1µF
CERAMIC
110Ω
2%
110Ω
110Ω
2%
110Ω
18 TOTAL
110Ω
2%
110Ω
LT1086 • TA03
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1086MK.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LT1086MH | 1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V/ 3.3V/ 3.6V/ 5V/ 12V | Linear Technology |
| LT1086MK | 1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V/ 3.3V/ 3.6V/ 5V/ 12V | Linear Technology |
| LT1086MK-12 | 1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V/ 3.3V/ 3.6V/ 5V/ 12V | Linear Technology |
| LT1086MK-5 | 1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V/ 3.3V/ 3.6V/ 5V/ 12V | Linear Technology |
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