LT1083,LT1084,LT1085.pdf

(169 KB) Pobierz
LT1083/LT1084/LT1085-7.5A, 5A, 3A Low Dropout Positive Adjustable Regulators
LT1083/LT1084/LT1085
7.5A, 5A, 3A Low Dropout
Positive Adjustable Regulators
FEATURES
DESCRIPTIO
■
Three-Terminal Adjustable
The LT ® 1083 series of positive adjustable regulators are
designed to provide 7.5A, 5A and 3A with higher efficiency
than currently available devices. All internal circuitry is
designed to operate down to 1V input-to-output differen-
tial and the dropout voltage is fully specified as a function
of load current. Dropout is guaranteed at a maximum of
1.5V at maximum output current, decreasing at lower load
currents. On-chip trimming adjusts the reference voltage
to 1%. Current limit is also trimmed, minimizing the stress
on both the regulator and power source circuitry under
overload conditions.
The LT1083/LT1084/LT1085 devices are pin compatible
with older three-terminal regulators. A 10 μ F output ca-
pacitor is required on these new devices. However, this is
included in most regulator designs.
Unlike PNP regulators, where up to 10% of the output
current is wasted as quiescent current, the LT1083 quies-
cent current flows into the load, increasing efficiency.
Output Current of 3A, 5A or 7.5A
■
■
Operates Down to 1V Dropout
Guaranteed Dropout Voltage at Multiple Current Levels
■
Line Regulation: 0.015%
■
■
Load Regulation: 0.1%
100% Thermal Limit Functional Test
■
Fixed Versions Available
■
■
Available in 3-Lead Plastic TO-220, TO-3P and DD
Packages
APPLICATIO U
■
High Efficiency Linear Regulators
■
Post Regulators for Switching Supplies
■
Constant Current Regulators
■
Battery Chargers
DEVICE OUTPUT CURRENT*
LT1083 7.5A
LT1084 5.0A
LT1085 3.0A
*For a 1.5A low dropout regulator see the LT1086 data sheet.
, LT, LTM and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
5V, 7.5A Regulator
Dropout Voltage vs Output Current
2
V IN ≥ 6.5V
IN
LT1083
OUT
5V AT 7.5A
+
ADJ
121 Ω
1%
+
10 μ F
10 μ F*
TANTALUM
1
365 Ω
1%
*REQUIRED FOR STABILITY
1083/4/5 ADJ TA01
0
0
I FULL LOAD
OUTPUT CURRENT
1083/4/5 ADJ TA02
108345ff
1
23709827.070.png 23709827.081.png 23709827.092.png 23709827.103.png 23709827.001.png 23709827.012.png 23709827.023.png 23709827.025.png 23709827.026.png 23709827.027.png 23709827.028.png 23709827.029.png 23709827.030.png 23709827.031.png 23709827.032.png 23709827.033.png 23709827.034.png
 
LT1083/LT1084/LT1085
ABSOLUTE M AXI M U M RATINGS
(Note 1)
Power Dissipation ............................... Internally Limited
Input-to-Output Voltage Differential
“C” Grades .......................................................... 30V
“I” Grades ............................................................ 30V
“M” Grades (OBSOLETE) ............................ 35V
Operating Junction Temperature Range
“C” Grades: Control Section .................. 0 ° C to 125 ° C
Power Transistor ............... 0 ° C to 150 ° C
“I” Grades: Control Section ............. – 40 ° C to 125 ° C
Power Transistor .......... – 40 ° C to 150 ° C
“M” Grades: (OBSOLETE)
Control Section ............. – 55 ° C to 150 ° C
Power Transistor .......... – 55 ° C to 200 ° C
Storage Temperature Range ................. – 65 ° C to 150 ° C
Lead Temperature (Soldering, 10 sec) .................. 300 ° C
PRECO DITIO I G
100% thermal shutdown functional test.
PACKAGE/ORDER I N FOR M ATIO N
FRONT VIEW
ORDER PART
NUMBER
TAB IS
OU TPU T
FRONT VIEW
ORDER PART
NUMBER
TAB
IS
OUTPUT
3
V IN
V OUT
ADJ
3
V IN
V OUT
ADJ
2
LT1084CT
LT1084IT
LT1085CT
LT1085IT
2
LT1083CP
LT1084CP
1
1
T PACKAGE
3-LEAD PLASTIC TO-220
P PACKAGE
3-LEAD PLASTIC TO-3P
θ JA = 50 ° C/W
θ JA = 35 ° C/W
BOTTOM VIEW
FRONT VIEW
LT1083CK
LT1083MK
LT1084CK
LT1084MK
LT1085CK
LT1085MK
LT1085CM
V IN
CASE IS
OUTPUT
3
V IN
V OUT
TAB
IS
OUTPUT
2
2
1
ADJ
1
ADJ
M PACKAGE
3-LEAD PLASTIC DD
K PACKAGE
2-LEAD TO-3 METAL CAN
θ JA = 35 ° C/W
θ JA = 30 ° C/W*
*WITH PACKAGE SOLDERED TO 0.5IN 2 COPPER AREA
OVER BACKSIDE GROUND PLANE OR INTERNAL POWER
PLANE. θ JA CAN VARY FROM 20 ° C/W TO > 40 ° C/W
DEPENDING ON MOUNTING TECHNIQUE.
OBSOLETE PACKAGE
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25 ° C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference Voltage
I OUT = 10mA, T J = 25 ° C,
(V IN – V OUT ) = 3V
1.238 1.250 1.262
V
10mA ≤ I OUT ≤ I FULL LOAD
1.5V ≤ (V IN – V OUT ) ≤ 25V (Notes 4, 6, 7)
●
1.225 1.250 1.270
V
Line Regulation
I LOAD = 10mA, 1.5V ≤ (V IN – V OUT ) ≤ 15V, T J = 25 ° C (Notes 2, 3)
0.015
0.2
%
●
0.035
0.2
%
M Grade: 15V ≤ (V IN – V OUT ) ≤ 35V (Notes 2, 3)
●
0.05
0.5
%
C, I Grades: 15V ≤ (V IN – V OUT ) ≤ 30V (Notes 2, 3)
●
0.05
0.5
%
108345ff
2
3
2
1
ELECTRICAL CHARACTERISTICS
23709827.035.png 23709827.036.png 23709827.037.png 23709827.038.png 23709827.039.png 23709827.040.png 23709827.041.png 23709827.042.png 23709827.043.png 23709827.044.png 23709827.045.png 23709827.046.png 23709827.047.png 23709827.048.png
 
LT1083/LT1084/LT1085
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25 ° C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Load Regulation
(V IN – V OUT ) = 3V
10mA ≤ I OUT ≤ I FULL LOAD
T J = 25 ° C (Notes 2, 3, 4, 6)
0.1
0.3
%
●
0.2
0.4
%
Dropout Voltage
Δ V REF = 1%, I OUT = I FULLLOAD (Notes 5, 6, 8)
●
1.3
1.5
V
Current Limit
LT1083
(V IN – V OUT ) = 5V
●
8.0
9.5
A
(V IN – V OUT ) = 25V
●
0.4
1.0
A
LT1084
(V IN – V OUT ) = 5V
●
5.5
6.5
A
(V IN – V OUT ) = 25V
●
0.3
0.6
A
LT1085
(V IN – V OUT ) = 5V
●
3.2
4.0
A
(V IN – V OUT ) = 25V
●
0.2
0.5
A
Minimum Load Current
(V IN – V OUT ) = 25V
●
5
10
A
Thermal Regulation
T A = 25 ° C, 30ms Pulse
LT1083
0.002 0.010
%/W
LT1084
0.003 0.015
%/W
LT1085
0.004 0.020
%/W
Ripple Rejection
f = 120Hz, C ADJ = 25 μ F, C OUT = 25 μ F Tantalum
I OUT = I FULL LOAD , (V IN – V OUT ) = 3V (Notes 6, 7, 8)
●
60
75
dB
Adjust Pin Current
T J = 25 ° C
55
μ A
●
120
μ A
Adjust Pin Current Change
10mA ≤ I OUT ≤ I FULL LOAD
1.5V ≤ (V IN – V OUT ) ≤ 25V (Note 6)
●
0.2
5
μ A
Temperature Stability
●
0.5
%
Long Term Stability
T A = 125 ° C, 1000 Hrs
0.3
1
%
RMS Output Noise (% of V OUT )
T A = 25 ° C
10Hz = ≤ f ≤ 10kHz
0.003
%
Thermal Resistance Junction-to-Case
Control Circuitry/Power Transistor
LT1083
K Package
0.6/1.6
° C/W
P Package
0.5/1.6
° C/W
LT1084
K Package
0.75/2.3
° C/W
P Package
0.65/2.3
° C/W
T Package
0.65/2.7
° C/W
LT1085
K Package
0.9/3.0
° C/W
M, T Packages
0.7/3.0
° C/W
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: See thermal regulation specifications for changes in output voltage
due to heating effects. Load and line regulation are measured at a constant
junction temperature by low duty cycle pulse testing.
Note 3: Line and load regulation are guaranteed up to the maximum power
dissapation (60W for the LT1083, 45W for the LT1084 (K, P), 30W for the
LT1084 (T) and 30W for the LT1085). Power dissipation is determined by
the input/output differential and the output current. Guaranteed maximum
power dissipation will not be available over the full input/output voltage
range.
Note 4: I FULL LOAD is defined in the current limit curves. The I FULLLOAD
curve is defined as the minimum value of current limit as a function of
input-to-output voltage. Note that the 60W power dissipation for the
LT1083 (45W for the LT1084 (K, P), 30W for the LT1084 (T), 30W for the
LT1085) is only achievable over a limited range of input-to-output voltage.
Note 5: Dropout voltage is specified over the full output current range of
the device. Test points and limits are shown on the Dropout Voltage
curve.
Note 6: For LT1083 I FULL LOAD is 5A for – 55 ° C ≤ T J < – 40 ° C and 7.5A for
T J ≥ –40 ° C.
Note 7: 1.7V ≤ (V IN – V OUT ) ≤ 25V for LT1084 at – 55 ° C ≤ T J ≤ –40 ° C.
Note 8: Dropout is 1.7V maximum for LT1084 at – 55 ° C ≤ T J ≤ –40 ° C.
108345ff
3
ELECTRICAL CHARACTERISTICS
23709827.049.png 23709827.050.png 23709827.051.png 23709827.052.png 23709827.053.png 23709827.054.png
LT1083/LT1084/LT1085
TYPICAL PERFOR M A N CE CHARACTERISTICS
LT1083
LT1083
LT1083
Dropout Voltage
Short-Circut Current
Load Regulation
2
12
0.10
INDICATES GUARANTEED TEST POINT
–40°C ≤ T J ≤ 150°C
0°C ≤ T J ≤ 125°C
Δ I = 7.5A
10
25 ° C
0.05
8
150 ° C
0
1
T J = 150°C
6
–0.05
–55 ° C
–0.10
4
T J = 25°C
T J = –55°C
2
–0.15
I FULL LOAD
GUARANTEED
0
0
–0.20
0
1234567890
0
5
10
15
20
25
30
35
–50
–25
0
25
50
75
100
125
150
OUTPUT CURRENT (A)
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (°C)
LT1083/4/5 ADJ G01
LT1083/4/5 ADJ G02
LT1083/4/5 ADJ G03
LT1084
LT1084
LT1084
Dropout Voltage
Short-Circut Current
Load Regulation
10
2
0.10
INDICATES GUARANTEED TEST POINT
9
Δ I = 5A
–55°C ≤ T J ≤ 150°C
8
0.05
0°C ≤ T J ≤ 125°C
7
150 ° C
0
6
25 ° C
–55 ° C
5
1
–0.05
T J = –55°C
4
T J = 150°C
T J = 25°C
3
–0.10
2
1
I FULL LOAD
–0.15
GUARANTEED
0
0
–0.20
0
5
10
15
20
25
30
35
0
1
2
3
4
5
6
–50
–25
0
25
50
75
100
125
150
INPUT/OUTPUT DIFFERENTIAL (V)
OUTPUT CURRENT (A)
TEMPERATURE (°C)
LT1083/4/5 ADJ G04
LT1083/4/5 ADJ G05
LT1083/4/5 ADJ G06
LT1085
LT1085
LT1085
Dropout Voltage
Short-Circuit Current
Load Regulation
2
6
0.10
INDICATES GUARANTEED TEST POINT
Δ I = 3A
–55°C ≤ T J ≤ 150°C
5
0.05
0°C ≤ T J ≤ 125°C
4
25 ° C
0
1
T J = –55°C
3
15 0 ° C
–0.05
T J = 25°C
–55 ° C
T J = 150°C
2
–0.10
1
I FULL LOAD
GUARANTEED
–0.15
0
0
–0.20
0
1
2
3
4
0
5
10
15
20
25
30
35
–50
–25
0
25
50
75
100
125
150
OUTPUT CURRENT (A)
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (°C)
LT1083/4/5 ADJ G07
LT1083/4/5 ADJ G08
LT1083/4/5 ADJ G09
108345ff
4
23709827.055.png 23709827.056.png 23709827.057.png 23709827.058.png 23709827.059.png 23709827.060.png 23709827.061.png 23709827.062.png 23709827.063.png 23709827.064.png 23709827.065.png 23709827.066.png 23709827.067.png 23709827.068.png 23709827.069.png 23709827.071.png 23709827.072.png 23709827.073.png 23709827.074.png 23709827.075.png 23709827.076.png 23709827.077.png 23709827.078.png 23709827.079.png 23709827.080.png 23709827.082.png 23709827.083.png 23709827.084.png 23709827.085.png 23709827.086.png 23709827.087.png 23709827.088.png 23709827.089.png 23709827.090.png 23709827.091.png 23709827.093.png 23709827.094.png 23709827.095.png 23709827.096.png 23709827.097.png 23709827.098.png 23709827.099.png 23709827.100.png 23709827.101.png 23709827.102.png 23709827.104.png 23709827.105.png 23709827.106.png 23709827.107.png 23709827.108.png 23709827.109.png 23709827.110.png 23709827.111.png 23709827.112.png 23709827.113.png 23709827.002.png 23709827.003.png 23709827.004.png
LT1083/LT1084/LT1085
TYPICAL PERFOR M A N CE CHARACTERISTICS
Minimum Operating Current
Temperature Stability
Adjust Pin Current
10
1.27
100
90
80
70
60
50
40
30
20
10
0
9
8
7
1.26
6
5
T J = 150°C
1.25
4
T J = 25°C
3
1.24
2
1
T J = –55°C
0
0
5
10
15
20
25
30
35
1.23
–50
–25
0
25
50
75
100
125
150
–50
–25
0
25
50
75
100
125
150
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
LT1083/4/5 ADJ G10
LT1083/4/5 ADJ G11
LT1083/4/5 ADJ G12
LT1083
LT1083
LT1083
Ripple Rejection
Ripple Rejection vs Current
Maximum Power Dissipation*
100
90
80
70
60
50
40
30
20
10
0 10
V RIPPLE ≤ 3V P-P
V RIPPLE
≤ 0.5V P-P
100
90
80
70
60
50
40
30
20
10
0
f R = 120Hz
V RIPPLE ≤ 3V P-P
100
90
80
70
60
50
40
30
20
10
0
(V IN – V OUT ) ≥ 3V
f R = 20kHz
V RIPPLE ≤ 0.5V P-P
LT1083MK
(V IN – V OUT ) ≥ V DROPOUT
LT1083CP
C ADJ = 200 μ F AT FREQUENCIES < 60Hz
C ADJ = 25 μ F AT FREQUENCIES > 60Hz
I OUT = 7A
V OUT = 5V
C ADJ = 25 μ F
C OUT = 25 μ F
LT1083CK
100
1k
10k
100k
0
1
2
3
4
5
6
7
8
50
60 70 80 90 100 110 120 130 140 150
FREQUENCY (Hz)
OUTPUT CURRENT (A)
CASE TEMPERATURE (°C)
1083/4/5 ADJ G13
1083/4/5 ADJ G14
* AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
LT1083/4/5 ADJ G15
LT1084
LT1084
LT1084
Ripple Rejection
Ripple Rejection vs Current
Maximum Power Dissipation*
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
60
V RIPPLE ≤ 3V P-P
V RIPPLE ≤ 0.5V P-P
f R = 120Hz
V RIPPLE ≤ 3V P-P
50
(V IN – V OUT ) ≥ 3V
f R = 20kHz
V RIPPLE ≤ 0.5V P-P
LT1084MK
40
(V IN – V OUT ) ≥ V DRO P OUT
30
LT1084CT
LT1084CP
20
C ADJ = 200 μ F AT FREQUENCIES < 60Hz
C ADJ = 25 μ F AT FREQUENCIES > 60Hz
I OUT = 5A
V OUT = 5V
C ADJ = 25 μ F
C OUT = 25 μ F
10
LT1084CK
0
10
100
1k
10k
100k
0
1
2
3
4
5
50
60 70 80 90 100 110 120 130 140 150
FREQUENCY (Hz)
OUTPUT CURRENT (A)
CASE TEMPERATURE (°C)
1083/4/5 ADJ G16
1083/4/5 ADJ G17
* AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
LT1083/4/5 ADJ G18
108345ff
5
23709827.005.png 23709827.006.png 23709827.007.png 23709827.008.png 23709827.009.png 23709827.010.png 23709827.011.png 23709827.013.png 23709827.014.png 23709827.015.png 23709827.016.png 23709827.017.png 23709827.018.png 23709827.019.png 23709827.020.png 23709827.021.png 23709827.022.png 23709827.024.png

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin