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LT1084CK-5 [Linear Systems]

3A, 5A, 7.5A Low Dropout Positive Fixed Regulators; 3A，5A ， 7.5A低压差正，固定式稳压器
LT1084CK-5
型号： LT1084CK-5
厂家： Linear Systems    Linear Systems
描述：

3A, 5A, 7.5A Low Dropout Positive Fixed Regulators
3A，5A ， 7.5A低压差正，固定式稳压器

稳压器 调节器 输出元件 局域网
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LT1083/LT1084/LT1085 Fixed  
3A, 5A, 7.5A Low Dropout  
Positive Fixed Regulators  
U
FEATURES  
DESCRIPTIO  
The LT®1083 series of positive adjustable regulators are  
designedtoprovide3A, 5Aand7.5Awithhigherefficiency  
than currently available devices. All internal circuitry is  
■
Three-Terminal 3.3V, 3.6V, 5V and 12V  
■
Output Current of 3A, 5A or 7.5A  
■
Operates Down to 1V Dropout  
■
Guaranteed Dropout Voltage at Multiple Current Levels designedtooperatedownto1Vinputtooutputdifferential  
■
■
■
■
Line Regulation: 0.015%  
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 output voltage to  
1%. Current limit is also trimmed, minimizing the stress  
on both the regulator and power source circuitry under  
overload conditions.  
Load Regulation: 0.1%  
100% Thermal Limit Functional Test  
Adjustable Versions Available  
U
APPLICATIO S  
■
High Efficiency Linear Regulators  
The LT1083 series devices are pin compatible with older  
three-terminal regulators. A 10μF output capacitor is  
required on these new devices; however, this is usually  
included in most regulator designs.  
■
Post Regulators for Switching Supplies  
■
Constant Current Regulators  
Battery Chargers  
■
DEVICE  
OUTPUT CURRENT*  
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.  
LT1083  
LT1084  
LT1085  
7.5 Amps  
5.0 Amps  
3.0 Amps  
*For a 1.5A low dropout regulator see the LT1086 data sheet.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
U
TYPICAL APPLICATIO  
5V, 7.5A Regulator  
Dropout Voltage vs Output Current  
2
V
≥ 6.5V  
5V AT 7.5A  
LT1083-5  
IN  
+
+
22μF*  
TANTALUM  
10μF  
LT1083/4/5 TA01  
1
0
*REQUIRED FOR STABILITY  
0
I
/2  
I
FULLLOAD  
FULLLOAD  
OUTPUT CURRENT (A)  
1083/4/5 TA02  
1083ffd  
1
LT1083/LT1084/LT1085 Fixed  
W W U W  
ABSOLUTE AXI U RATI GS  
(Note 1)  
Power Dissipation.............................. Internally Limited  
Input Voltage* ........................................................ 30V  
Operating Input Voltage  
3.3V, 3.6V Devices ........................................... 20V  
5V Devices ....................................................... 20V  
12V Devices ..................................................... 25V  
Operating Junction Temperature Range  
“C” Grades  
Storage Temperature Range ................ –65°C to 150°C  
Lead Temperature (Soldering, 10 sec)................. 300°C  
*Although the devices maximum operating voltage is limited, (20V for a  
3V, 5V device, and 25V for a 12V device) the devices are guaranteed to  
withstand transient input voltages up to 30V. For input voltages greater  
than the maximum operating input voltage some degradation of  
specifications will occur. For input/output voltage differentials greater than  
15V, a minimum external load of 5mA is required to maintain regulation.  
Control Section .............................. 0°C to 125°C  
Power Transistor............................ 0°C to 150°C  
“M” Grades  
U
U U  
PRECO DITIO I G  
100% Thermal Limit Functional Test.  
Control Section .......................... –55°C to 150°C  
Power Transistor........................ –55°C to 200°C  
U W  
U
PACKAGE/ORDER I FOR ATIO  
ORDER PART NUMBER  
ORDER PART NUMBER  
CASE IS  
OUTPUT  
V
IN  
LT1084MK-5  
LT1084MK-12  
LT1085CK-5  
LT1085CK-12  
LT1085MK-5  
LT1085MK-12  
LT1083CK-5  
LT1083CK-12  
LT1083MK-5  
LT1083MK-12  
LT1084CK-5  
LT1084CK-12  
LT1083CP-5  
LT1083CP-12  
LT1084CP-5  
LT1084CP-12  
2
1
FRONT VIEW  
TAB IS  
OUTPUT  
3
2
1
V
V
IN  
GND  
OUT  
K PACKAGE  
2-LEAD TO-3 METAL CAN  
GND  
θJA = 35°C/W  
P PACKAGE  
3-LEAD TO-3P PLASTIC  
θ
JA = 45°C/W  
OBSOLETE NOT RECOMMENDED  
FOR NEW DESIGNS  
FRONT VIEW  
LT1084CT-3.3  
LT1085CM-3.3  
LT1085CM-3.6  
LT1085IM-3.6  
FRONT VIEW  
3
2
1
V
LT1084CT-5  
IN  
TAB IS  
OUTPUT  
TAB IS  
OUTPUT  
LT1084CT-12  
LT1085CT-3.3  
LT1085CT-3.6  
LT1085CT-5  
LT1085CT-12  
V
OUT  
3
2
1
V
V
IN  
GND  
OUT  
M PACKAGE  
3-LEAD PLASTIC DD  
GND  
θ
JA = 30°C/W*  
*WITH PACKAGE SOLDERED TO 0.52IN2  
COPPER AREA OVER BACKSIDE GROUND  
PLANE OR INTERNAL POWER PLANE. θJA CAN  
VARY FROM 20°C/W TO > 40°C/W DEPENDING  
ON MOUNTING TECHNIQUE.  
T PACKAGE  
3-LEAD PLASTIC TO-220  
θ
JA = 50°C/W  
Consult factory for parts specified with wider operating temperature ranges.  
1083ffd  
2
LT1083/LT1084/LT1085 Fixed  
ELECTRICAL CHARACTERISTICS  
The ● denotes the specifications which apply over the full operating  
temperature range, otherwise specifications are at TA = 25°C.  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Output Voltage  
LT1084-3.3  
I
= 0mA, T = 25°C, V = 8V (K Package Only)  
3.270  
3.235  
3.300  
3.300  
3.330  
3.365  
V
V
OUT  
J
IN  
4.8V ≤ V ≤ 15V, 0 ≤ I  
≤ I (Notes 3, 4, 9)  
FULLOAD  
●
●
●
●
IN  
OUT  
LT1085-3.3  
LT1085-3.6  
V
= 5V, I  
= 0mA, T = 25°C (K Package Only)  
3.270  
3.235  
3.300  
3.300  
3.330  
3.365  
V
V
IN  
OUT  
J
4.8V ≤ V ≤ 15V, 0 ≤ I  
≤ I  
(Notes 3, 4, 9)  
FULLOAD  
IN  
OUT  
V
= 5V, I  
IN  
IN  
= 0mA, T = 25°C (K Package Only)  
3.564  
3.500  
3.528  
3.600  
3.636  
3.672  
3.672  
V
V
V
IN  
OUT  
J
5V ≤ V ≤ 15V, 0 ≤ I  
≤ I  
≤ I  
(Note 9)  
OUT  
FULLOAD  
5V ≤ V ≤ 15V, 0 ≤ I  
, TJ ≥ 0°C (Notes 3, 4, 9)  
OUT  
FULLOAD  
LT1085-3.6  
5V ≤ V ≤ 15V, 0 ≤ I  
≤ 2.5A (Notes 3, 4, 9)  
J
3.528  
3.350  
3.450  
3.528  
3.672  
3.672  
3.672  
3.672  
V
V
V
V
IN  
OUT  
V
V
V
= 4.75V, I  
= 4.75V, I  
= 4.75V, I  
= 3A, T ≥ 0°C  
IN  
IN  
IN  
OUT  
OUT  
OUT  
= 2.5A, T ≥ 0°C  
J
= 1.5A, T > 0°C  
J
LT1083/4/5-5  
LT1083/4/5-12  
LT1084-3.3  
I
= 0mA, T = 25°C, V = 8V (K Package Only)  
4.950  
4.900  
5.000  
5.000  
5.050  
5.100  
V
V
OUT  
0 ≤ I  
J
IN  
≤ I  
, 6.5V ≤ V ≤ 20V (Notes 4, 6, 7, 9)  
OUT  
FULLOAD IN  
I
= 0mA, T = 25°C, V = 15V (K Package Only)  
11.880 12.000 12.120  
11.760 12.000 12.240  
V
V
OUT  
J
IN  
0 ≤ I  
≤ I  
, 13.5V ≤ V ≤ 25V (Notes 4, 6, 7, 9)  
OUT  
FULLOAD IN  
Line Regulation  
I
= 0mA, T = 25°C, 4.8V ≤ V ≤ 15V  
0.5  
1.0  
6
6
mV  
mV  
OUT  
J
IN  
●
●
●
●
●
●
●
●
●
LT1085-3.3  
4.8V ≤ V ≤ 15V, I  
= 0mA, T = 25°C  
0.5  
1.0  
6
6
mV  
mV  
IN  
OUT  
J
LT1085-3.6  
4.8V ≤ V ≤ 15V, I  
= 0mA, T = 25°C  
0.5  
1.0  
6
6
mV  
mV  
IN  
OUT  
J
LT1083/4/5-5  
LT1083/4/5-12  
LT1084-3.3  
I
I
= 0mA, T = 25°C, 6.5V ≤ V ≤ 20V (Notes 2, 3)  
0.5  
1.0  
10  
10  
mV  
mV  
OUT  
OUT  
J
IN  
= 0mA, T = 25°C, 13.5V ≤ V ≤ 25V (Notes 2, 3)  
1.0  
2.0  
25  
25  
mV  
mV  
J
IN  
Load Regulation  
V
V
V
V
V
= 5V, 0 ≤ I  
≤ 5A, T = 25°C  
3
7
15  
20  
mV  
mV  
IN  
IN  
IN  
IN  
IN  
OUT  
J
LT1085-3.3  
= 5V, 0 ≤ I  
≤ 3A, T = 25°C  
3
7
15  
20  
mV  
mV  
OUT  
J
LT1085-3.6  
= 5.25V, 0 ≤ I  
≤ 3A, T = 25°C  
3
7
15  
20  
mV  
mV  
OUT  
J
LT1083/4/5-5  
LT1083/4/5-12  
= 8V, 0 ≤ I  
≤ I T = 25°C (Notes 2, 3, 4, 6)  
FULLLOAD, J  
5
10  
20  
35  
mV  
mV  
OUT  
= 15V, 0 ≤ I  
≤ I  
T = 25°C (Notes 2, 3, 4, 6)  
FULLLOAD, J  
12  
24  
36  
72  
mV  
mV  
OUT  
●
●
●
●
●
●
●
●
●
●
●
●
●
Dropout Voltage  
Current Limit  
LT1084/5-3.3 ΔV  
= 33mV, I  
= 36mV, I  
= 50mV, I  
= I  
(Notes 5, 6)  
(Notes 5, 6)  
(Notes 5, 6)  
1.3  
1.3  
1.3  
1.3  
9.5  
9.5  
6.5  
6.5  
6.5  
4.0  
4.0  
4.0  
1.5  
1.5  
1.5  
1.5  
V
V
V
V
A
A
A
A
A
A
A
A
OUT  
OUT  
OUT  
OUT  
OUT  
FULL LOAD  
FULL LOAD  
FULL LOAD  
LT1085-3.6  
ΔV  
= I  
= I  
OUT  
OUT  
LT1083/4/5-5 ΔV  
LT1083/4/5-12 ΔV  
= 120mV, I  
= I  
(Notes 5, 6)  
FULL LOAD  
OUT  
LT1083-5  
LT1083-12  
LT1084-3.3  
LT1084-5  
LT1084-12  
V
V
V
V
V
= 10V  
8.0  
8.0  
5.5  
5.5  
5.5  
3.2  
3.2  
3.2  
IN  
IN  
IN  
IN  
IN  
= 17V  
= 8V  
= 10V  
= 17V  
LT1085-3.3/3.6 V = 8V  
IN  
LT1085-5  
V
V
= 10V  
= 17V  
IN  
IN  
LT1085-12  
1083ffd  
3
LT1083/LT1084/LT1085 Fixed  
ELECTRICAL CHARACTERISTICS  
The ● denotes the specifications which apply over the full operating  
temperature range, otherwise specifications are at TA = 25°C.  
PARAMETER  
CONDITIONS  
LT1084-3.3  
LT1085-3.3  
LT1085-3.6  
LT1083/4/5-5  
LT1083/4/5-12  
MIN  
TYP  
5.0  
5.0  
5.0  
5.0  
5.0  
MAX  
10.0  
10.0  
10.0  
10.0  
10.0  
UNITS  
mA  
Quiescient Current  
V
V
V
V
V
= 18V  
= 18V  
= 18V  
≤ 20V  
≤ 25V  
●
●
●
●
●
IN  
IN  
IN  
IN  
IN  
mA  
mA  
mA  
mA  
Thermal Regulation  
Ripple Rejection  
LT1083-5/12  
T = 25°C, 30ms pulse  
0.002  
0.003  
0.004  
0.010  
0.015  
0.020  
%/W  
%/W  
%/W  
A
LT1084-3.3/5/12  
LT1085-3.3/3.6/5/12  
f = 120Hz, C  
LT1084-3.3  
LT1085-3.3  
LT1085-3.6  
= 25μF Tantalum, I  
= I  
(Note 4)  
FULLLOAD  
OUT  
OUT  
f = 120Hz, C  
f = 120Hz, C  
f = 120Hz, C  
= 25μF Tantalum, I  
= 5A, V = 6.3V  
●
●
●
●
●
60  
60  
60  
60  
54  
72  
72  
72  
68  
60  
dB  
dB  
dB  
dB  
dB  
OUT  
OUT  
OUT  
OUT  
IN  
IN  
IN  
= 25μF Tantalum, V = 6.3V, I  
= 3A  
= 3A  
OUT  
OUT  
= 25μF Tantalum, V = 6.6V, I  
LT1083/4/5-5  
LT1083/4/5-12  
V
V
= 8V (Note 6)  
= 15V (Note 6)  
IN  
IN  
Temperature Stability  
Long Term Stability  
RMS Output Noise  
●
0.5  
%
%
T = 125°C, 1000 Hrs.  
0.03  
1.0  
A
T = 25°C,  
A
(% of V  
)
10Hz = ≤ f ≤ 10kHz  
0.003  
%
OUT  
Thermal Resistance  
Junctrion-to-Case  
Control Circuitry/Power Transistor (See Applications Information)  
LT1083  
LT1084  
K Package  
P Package  
0.6/1.6  
0.5/1.6  
°C/W  
°C/W  
K Package  
P Package  
T Package  
0.75/2.3  
0.65/2.3  
0.65/2.7  
°C/W  
°C/W  
°C/W  
LT1085  
K Package  
T Package  
DD Package  
0.9/3.0  
0.7/3.0  
0.7/3.0  
°C/W  
°C/W  
°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 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  
T ≥ – 40°C.  
J
is 5A for –55°C ≤ T ≤ –40°C and 7.5A for  
J
FULL LOAD  
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  
dissipation (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 range.  
Note 7: 1.7V ≤ (V – V ) ≤ 25V for LT1084 at –55°C ≤ T ≤ – 40°C.  
IN  
OUT  
J
Note 8: Dropout voltage 1.7V maximum for LT1084 at  
–55°C ≤ T ≤ –40°C.  
J
Note 9: Full load current is not available at all input-output voltages.  
See Notes 3, 4, 6.  
Note 4: I  
is defined in the current limit curves. The I  
FULL LOAD  
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.  
1083ffd  
4
LT1083/LT1084/LT1085 Fixed  
TYPICAL PERFOR A CE CHARACTERISTICS  
U W  
LT1083 Dropout Voltage  
LT1083 Short-Circuit Current  
LT1083 Load Regulation  
0.10  
0.05  
2
12  
10  
8
ΔI = 7.5A  
INDICATES GUARANTEED TEST POINT  
–40°C ≤ T ≤ 150°C  
25°C  
J
0°C ≤ T ≤ 125°C  
J
150°C  
0
–0.05  
–0.10  
–0.15  
–0.20  
1
6
T = 150°C  
J
–55°C  
4
2
0
T = 25°C  
J
T = –55°C  
J
I
FULL LOAD  
GUARANTEED  
10  
INPUT/OUTPUT DIFFERENTIAL (V)  
0
75 100  
TEMPERATURE (°C)  
–50 –25  
0
25 50  
125 150  
20  
30  
35  
0
1
2
3
4
5
6
7
8
9
10  
0
5
15  
25  
OUTPUT CURRENT (A)  
LT1083/4/5 FIXED G03  
LT1083/4/5 FIXED G01  
LT1083/4/5 FIXED G02  
LT1084 Dropout Voltage  
LT1084 Short Circuit Current  
LT1084 Load Regulation  
10  
9
8
7
6
5
4
3
2
1
0
0.10  
0.05  
2
ΔI = 5A  
INDICATES GUARANTEED TEST POINT  
–55°C ≤ T ≤ 150°C  
J
0°C ≤ T ≤ 125°C  
J
150°C  
25°C  
0
–55°C  
–0.05  
–0.10  
–0.15  
–0.20  
1
T = –55°C  
J
T = 25°C  
J
T = 150°C  
J
I
FULL LOAD  
GUARANTEED  
0
2
75 100  
–50 –25  
0
25 50  
125 150  
0
10  
15  
20  
25  
30  
35  
5
0
1
3
4
5
6
2
TEMPERATURE (°C)  
INPUT/OUTPUT DIFFERENTIAL (V)  
OUTPUT CURRENT (A)  
LT1083/4/5 FIXED G06  
LT1083/4/5 FIXED G05  
LT1083/4/5 FIXEDG04  
LT1085 Dropout Voltage  
LT1085 Short-Circuit Current  
LT1085 Load Regulation  
6
5
4
3
0.10  
0.05  
ΔI = 3A  
INDICATES GUARANTEED TEST POINT  
–55°C ≤ T ≤ 150°C  
J
0°C ≤ T ≤ 125°C  
J
25°C  
0
150°C  
–0.05  
–0.10  
–0.15  
–0.20  
1
0
T
= –55°C  
J
T
= 25°C  
–55°C  
J
T
= 150°C  
2
1
0
J
I
FULL LOAD  
GUARANTEED  
75 100  
–50 –25  
0
25 50  
125 150  
0
2
3
1
4
20  
30  
35  
0
5
10  
15  
25  
TEMPERATURE (°C)  
OUTPUT CURRENT (A)  
INPUT/OUTPUT DIFFERENTIAL (V)  
LT1083/4/5 FIXED G09  
LT1083/4/5 FIXED G07  
LT1083/4/5 FIXED G08  
1083ffd  
5
LT1083/LT1084/LT1085 Fixed  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
LT1083/4/5-5 Ripple Rejection  
vs Current  
LT1083/4/5-5 Ripple Rejection  
Temperature Stability  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
80  
70  
60  
50  
2.0  
1.0  
V
≤ 3V  
P-P  
V
RIPPLE  
RIPPLE  
≤ 0.5V  
P-P  
f
= 120Hz  
RIPPLE  
R
V
(V – V ) ≥ 3V  
IN  
OUT  
≤ 3V  
P-P  
f
= 20kHz  
RIPPLE  
R
(V – V ) ≥ V  
IN  
OUT  
DROPOUT  
V
≤ 0.5V  
P-P  
40  
30  
0
20  
10  
0
–1.0  
I
= I  
OUT FULLLOAD  
–2.0  
10  
100  
1k  
10k  
100k  
0
0.8  
1.0  
–50 –25  
0
25 50 75 100 125 150  
TEMPERATURE (°C)  
0.2  
0.4  
0.6  
FREQUENCY (Hz)  
OUTPUT CURRENT (0 TO I  
)
FULLLOAD  
1083/4/5 FIXED G10  
1083/4/5 FIXED G11  
LT1183/4/5 FIXED G12  
LT1083/4/5-12 Ripple Rejection  
vs Current  
LT1083 Maximum Power  
Dissipation*  
LT1083/4/5-12 Ripple Rejection  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
80  
70  
60  
50  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
V
≤ 3V  
P-P  
V
RIPPLE  
RIPPLE  
≤ 0.5V  
P-P  
f
= 120Hz  
RIPPLE  
R
V
≤ 3V  
P-P  
(V – V ) ≥ 3V  
IN  
OUT  
LT1083MK  
f
= 20kHz  
RIPPLE  
R
40  
30  
V
≤ 0.5V  
P-P  
(V – V ) ≥ V  
DROPOUT  
IN  
OUT  
LT1083CP  
20  
10  
0
LT1083CK  
I
= I  
OUT FULLLOAD  
10  
100  
1k  
10k  
100k  
0
0.8  
1.0  
50 60 70 80 90 100 110 120 130 140 150  
0.2  
0.4  
0.6  
FREQUENCY (Hz)  
OUTPUT CURRENT (0 TO I  
)
CASE TEMPERATURE (°C)  
* AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE  
FULLLOAD  
1083/4/5 FIXED G13  
1083/4/5 FIXED G14  
LT1083/4/5 FIXED G15  
LT1084 Maximum Power  
Dissipation*  
LT1085 Maximum Power  
Dissipation*  
60  
50  
40  
30  
20  
10  
0
50  
40  
30  
20  
10  
0
LT1084MK  
LT1084CP  
LT1085MK  
LT1084CT  
LT1085CT  
LT1084CK  
LT1085CK  
50 60 70 80 90 100 110 120 130 140 150  
50 60 70 80 90 100 110 120 130 140 150  
CASE TEMPERATURE (°C)  
CASE TEMPERATURE (°C)  
* AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE  
* AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE  
LT1083/4/5 FIXED G16  
LT1083/4/5 FIXED G17  
1083ffd  
6
LT1083/LT1084/LT1085 Fixed  
W
BLOCK DIAGRA  
V
IN  
+
–
THERMAL  
LIMIT  
V
OUT  
GND  
LT1083/4/5 BD  
W U U  
U
APPLICATIO S I FOR ATIO  
TheLT1083familyofthree-terminalregulatorsareeasyto  
use and have all the protection features that are expected  
in high performance voltage regulators. They are short  
circuit protected, have safe area protection as well as  
thermal shutdown to turn off the regulator should the  
temperature exceed about 165°C.  
teristics are available. These capacitors differ in capacitor  
tolerance (sometimes ranging up to ±100%), equivalent  
series resistance, and capacitance temperature coeffi-  
cient. The 150μF or 22μF values given will ensure stability.  
Normally, capacitor values on the order of 100μF are used  
in the output of many regulators to ensure good transient  
responsewithheavyloadcurrentchanges. Outputcapaci-  
tance can be increased without limit and larger values of  
output capacitance further improve stability and transient  
response of the LT1083 regulators.  
These regulators offer lower dropout voltage and more  
precise reference tolerance. Further, the reference stabil-  
ity with temperature is improved over older types of  
regulators. The only circuit difference between using the  
LT1083 family and older regulators is that they require an  
output capacitor for stability.  
Another possible stability problem that can occur in  
monolithic IC regulators is current limit oscillations.  
These can occur because in current limit the safe area  
protection exhibits a negative impedance. The safe area  
protection decreases the current limit as the input-to-  
output voltage increases.That is the equivalent of having  
a negitive resistance since increasing voltage causes  
current to decrease. Negitive resistance during current  
limit is not unique to the LT1083 series and has been  
present on all power IC regulators. The value of negative  
Stability  
The circuit design used in the LT1083 family requires the  
use of an output capacitor as part of the device frequency  
compensation.Foralloperatingconditions,theadditionof  
150μF aluminum electrolytic or a 22μF solid tantalum on  
the output will ensure stability. Normally capacitors much  
smaller than this can be used with the LT1083. Many  
different types of capacitors with widely varying charac-  
resistance is a function of how fast the current limit is  
1083ffd  
7
LT1083/LT1084/LT1085 Fixed  
W U U  
U
APPLICATIO S I FOR ATIO  
folded back as input-to-output voltage increases. This  
negative resistance can react with capacitors or inductors  
on the input to cause oscillations during current limiting.  
Depending on the value of series resistance, the overall  
circuitry may end up unstable. Since this is a system  
problem, it is not necessarily easy to solve; however it  
doesnotcauseanyproblemswiththeICregulatorandcan  
usually be ignored.  
up into very heavy loads. During the start-up, as the input  
voltage is rising, the input-to-output voltage differential  
remains small allowing the regulator to supply large  
output currents. With high input voltage a problem can  
occurwhereinremovalofanoutputshortwillnotallowthe  
output voltage to recover. Older regulators such as the  
7800 series, also exhibited this phenomenon so it is not  
unique to the LT1083.  
The problem occurs with a heavy output load when the  
input voltage is high and the output voltage is low, such as  
immediately after a removal of a short. The load line for  
such a load may intersect the output current curve at two  
points. If this happens there are two stable output operat-  
ing points for the regulator. With this double intersection  
the power supply may need to be cycled down to zero and  
brought up again to make the output recover.  
Protection Diodes  
In normal operation the LT1083 family does not need any  
protection diodes, The internal diode between the input  
and the output pins of the LT1083 family can handle  
microsecond surge currents of 50A to 100A. Even with  
large output capacitances it is very difficult to get those  
valuesofsurgecurrentinnormaloperation.Onlywithhigh  
value output capacitors, such as 1000μF to 5000μF and  
with the input pin instantaneously shorted to ground, can  
damageoccur. AcrowbarcircuitattheinputoftheLT1083  
can generate those kinds of currents and a diode from  
output-to-inputisthenrecommended.Normalpowersup-  
ply cycling or even plugging and unplugging in the system  
will not generate currents large enough to do any damage.  
Ripple Rejection  
In applications that require improved ripple rejection the  
LT1083 series adjustable regulators should be used. With  
LT1083 series adjustable regulators the addition of a  
bypass capacitor from the adjust pin to ground will reduce  
output ripple by the ratio of VOUT/1.25V. See LT1083  
series adjustable regulator data sheet.  
D1  
1N4002  
(OPTIONAL)  
Load Regulation  
Because the LT1083 is a three-terminal device, it is not  
possible to provide true remote load sensing. Load regu-  
lation will not be limited by the resistance of the wire  
connecting the regulator to the load. The data sheet  
specification for the load regulation is measured at the  
bottom of the package. Negative side sensing is a true  
Kelvin connection, with the ground pin of the device  
returned to the negative side of the load.  
IN  
OUT  
LT1083  
ADJ  
V
OUT  
V
IN  
+
C
OUT  
150μF  
1083/4/5 AI01  
Overload Recovery  
Like any of the IC power regulators, the LT1083 has safe  
area protection. The safe area protection decreases the  
current limit as input-to-output voltage increases and  
keeps the power transistor inside a safe operating region  
for all values of input-to-output voltage. The LT1083  
protection is designed to provide some output current at  
all values of input-to-output voltage up to the device  
breakdown.  
Thermal Considerations  
The LT1083 series of regulators have internal power and  
thermal limiting circuitry designed to protect the device  
under overload conditions. For continuous normal load  
conditionshowever, maximumjunctiontemperaturerat-  
ings must not be exceeded. It is important to give careful  
consideration to all sources of thermal resistance from  
junction to ambient. This includes junction-to-case,  
When power is first turned on, as the input voltage rises,  
the output follows the input, allowing the regulator to start  
1083ffd  
8
LT1083/LT1084/LT1085 Fixed  
W U U  
APPLICATIO S I FOR ATIO  
U
case-to-heatsinkinterface,andheatsinkresistanceitself.  
New thermal resistance specifications have been devel-  
oped to more accurately reflect device temperature and  
ensure safe operating temperatures. The data section for  
these new regulators provides a separate thermal resis-  
tance and maximum junction temperature for both the  
Control Section and the Power Section. Previous regula-  
tors, with a single junction-to-case thermal resistance  
specification, used an average of the two values provided  
here and therefore could allow excessive junction tem-  
peratures under certain conditions of ambient tempera-  
ture and heat sink resistance. To avoid this possibility,  
calculations should be made for both sections to ensure  
that both thermal limits are met.  
For example, using a LT1083-5CP (TO-3P, Commercial)  
and assuming:  
VIN(max continuous) = 9V, VOUT = 5V, IOUT = 6A,  
TA = 75°C, θHEAT SINK = 1°C/W,  
θ
CASE-TO-HEAT SINK = 0.2°C/W for P package with  
thermal compound.  
Power dissipation under these conditions is equal to:  
PD = (VIN – VOUT) (IOUT) = 24W  
Junction temperature will be equal to:  
TJ = TA + PD (θHEAT SINK + θCASE-TO-HEAT SINK + θJC)  
For the Control Section:  
TJ = 75°C + 24W (1°C/W + 0.2°C/W + 0.5°C/W) =  
118°C  
Junction-to-case thermal resistance is specified from the  
ICjunctiontothebottomofthecasedirectlybelowthedie.  
This is the lowest resistance path for heat flow. Proper  
mounting is required to ensure the best possible thermal  
flowfromthisareaofthepackagetotheheatsink.Thermal  
compound at the case-to-heat sink interface is strongly  
recommended. If the case of the device must be electroni-  
cally 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 electronically connected to the ouput.  
118°C < 125°C = TJMAX (Control Section Commer-  
cial Range)  
For the Power Transistor:  
TJ = 75°C + 24W (1°C/W + 0.2°C/W + 1.6°C/W) =  
142°C  
142°C < 150°C = TJMAX (Power Transistor Commer-  
cial Range)  
In both cases the junction temperature is below the  
maximum rating for the respective sections, ensuring  
reliable operation.  
U
TYPICAL APPLICATIO S  
High Efficiency Regulator  
Paralleling Regulators  
1mH  
2 FEET #18 WIRE*  
28V  
INPUT  
OUTPUT  
IN  
LT1083-5 OUT  
GND  
V
IN  
IN  
LT1083-5 OUT  
GND  
IN  
+
10,000μF  
MR1122  
V
= 5V  
= 0A TO 15A  
470Ω  
1N914  
OUT  
OUT  
10k  
I
0.015Ω  
28V  
LT1083-5 OUT  
GND  
*THE #18 WIRE ACTS  
AS BALLAST RESISTANCE  
INSURING CURRENT SHARING  
BETWEEN BOTH DEVICES  
1k  
1M  
4N28  
10k  
LT1083/4/5 TA04  
LT1083/4/5 TA03  
+
–
LT1011  
10k  
28V  
1N914  
1083ffd  
9
LT1083/LT1084/LT1085 Fixed  
U
TYPICAL APPLICATIO S  
7.5A Regulator  
T1  
L
1MH  
TRIAD  
C30B  
F-269U  
12V  
IN  
LT1083-12 OUT  
GND  
0A TO 7.5A  
+
C1  
50,000μF  
20Ω  
+
T2  
1N4003  
3
4
2
100μF  
110VAC  
20Ω  
1
LT1004-1.2  
C30B  
1N4003  
1N4003  
1N914  
16k*  
16k*  
1μF  
560Ω  
15V  
82k  
10k  
8
15k  
–15V  
4
11k*  
200k  
2
+
–
7
LT1011  
0.1μF  
3
1
NC  
1N4148  
100pF  
15V  
8
2N3904  
10k  
–15V  
4
3
2
1
–
7
3
2
8
LM301A  
LT1011  
+
1% FILM RESISTOR  
L-DALE TO-5 TYPE  
*
6
+
T2-STANCOR 11Z-2003  
1
–
7
15k  
15V  
4
11k*  
15V  
–15V  
REGULATOR WITH SCR PREREGULATOR TO  
LOWER POWER DISSIPATION. ABOUT 1.7V  
DIFFERENTIAL IS MAINTAINED ACROSS THE  
LT1083 INDEPENDENT OF LOAD CURRENT.  
LT1083/4/5 TA05  
1μF  
U
PACKAGE DESCRIPTIO  
T Package  
K Package  
2-Lead TO-3 Metal Can  
(LTC DWG # 05-08-1310)  
3-Lead Plastic TO-220  
(LTC DWG # 05-08-1420)  
.760 – .775  
(19.30 – 19.69)  
.147 – .155  
(3.734 – 3.937)  
DIA  
.320 – .350  
(8.13 – 8.89)  
.165 – .180  
(4.191 – 4.572)  
.390 – .415  
(9.906 – 10.541)  
.045 – .055  
.060 – .135  
(1.143 – 1.397)  
(1.524 – 3.429)  
.230 – .270  
(5.842 – 6.858)  
.420 – .480  
.570 – .620  
(10.67 – 12.19)  
.460 – .500  
(14.478 – 15.748)  
(11.684 – 12.700)  
.330 – .370  
(8.382 – 9.398)  
.038 – .043  
(0.965 – 1.09)  
.980 – 1.070  
(24.892 – 27.178)  
1.177 – 1.197  
(29.90 – 30.40)  
.520 – .570  
(13.208 – 14.478)  
.655 – .675  
(16.64 – 17.15)  
.218 – .252  
(5.537 – 6.401)  
.210 – .220  
(5.33 – 5.59)  
.151 – .161  
(3.86 – 4.09)  
DIA, 2PLCS  
.013 – .023  
.100  
(2.540)  
BSC  
(0.330 – 0.584)  
.095 – .115  
(2.413 – 2.921)  
T3 (TO-220) 0801  
.050  
(1.270)  
TYP  
.167 – .177  
(4.24 – 4.49)  
R
.028 – .038  
(0.711 – 0.965)  
.425 – .435  
(10.80 – 11.05)  
.067 – .077  
(1.70 – 1.96)  
.490 – .510  
(12.45 – 12.95)  
R
K2 (TO-3) 0801  
OBSOLETE PACKAGE  
1083ffd  
10  
LT1083/LT1084/LT1085 Fixed  
U
PACKAGE DESCRIPTIO  
M Package  
3-Lead Plastic DD Pak  
(LTC DWG # 05-08-1460)  
.060  
(1.524)  
TYP  
.390 – .415  
(9.906 – 10.541)  
.060  
.256  
.165 – .180  
(4.191 – 4.572)  
(1.524)  
(6.502)  
.045 – .055  
(1.143 – 1.397)  
15°  
+.008  
.004  
–.004  
.060  
(1.524)  
.183  
(4.648)  
.330 – .370  
(8.382 – 9.398)  
.059  
(1.499)  
+0.203  
–0.102  
0.102  
(
)
.095 – .115  
(2.413 – 2.921)  
.075  
(1.905)  
.100  
(2.54)  
BSC  
.050 ± .012  
(1.270 ± 0.305)  
.300  
(7.620)  
+.012  
.143  
.013 – .023  
(0.330 – 0.584)  
–.020  
.050  
(1.270)  
+0.305  
3.632  
BOTTOM VIEW OF DD PAK  
HATCHED AREA IS SOLDER PLATED  
COPPER HEAT SINK  
(
)
–0.508  
.420  
.276  
.080  
.420  
.350  
.325  
.205  
.320  
.565  
.565  
NOTE:  
1. DIMENSIONS IN INCH/(MILLIMETER)  
2. DRAWING NOT TO SCALE  
.090  
.090  
M (DD3) 0204  
.100  
.070  
.100  
.070  
RECOMMENDED SOLDER PAD LAYOUT  
RECOMMENDED SOLDER PAD LAYOUT  
FOR THICKER SOLDER PASTE APPLICATIONS  
P Package  
3-Lead Plastic TO-3P (Similar to TO-247)  
(LTC DWG # 05-08-1450)  
.560  
.187 – .207  
(4.75 – 5.26)  
(14.224)  
.620 – .64O  
(15.75 – 16.26)  
.325  
(8.255)  
.275  
(6.985)  
.060 – .080  
(1.52 – 2.03)  
MOUNTING HOLE  
18° – 22°  
.115 – .145  
(2.92 – 3.68)  
DIA  
.580  
(14.732)  
.830 – .870  
(21.08 – 22.10)  
.170 – .2OO  
(4.32 – 5.08)  
.700  
(17.780)  
EJECTOR PIN MARKS  
.105 – .125  
.580 – .6OO  
(14.73 – 15.24)  
(2.67 – 3.18)  
DIA  
.098  
(2.489)  
3° – 7°  
.170  
(4.32)  
MAX  
.124  
(3.149)  
.780 – .800  
(19.81 – 20.32)  
.042 – .052  
(1.07 – 1.32)  
.215  
(5.46)  
BSC  
.087 – .102  
(2.21 – 2.59)  
BOTTOM VIEW OF TO-3P  
HATCHED AREA IS SOLDER PLATED  
COPPER HEAT SINK  
.020 – .040  
(0.51 – 1.02)  
P3 0801  
.074 – .084  
(1.88 – 2.13)  
.113 – .123  
(2.87 – 3.12)  
1083ffd  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
11  
LT1083/LT1084/LT1085 Fixed  
U
TYPICAL APPLICATIO S  
Adjusting Output Voltage  
Regulator with Reference  
V
IN  
> 12V  
V
> 11.5V  
IN  
10V  
100μF  
LT1085-5  
LT1085-5  
5V to 10V  
100μF  
+
+
+
+
10μF  
10μF  
5V  
OUT  
+
LT1029  
1k  
10μF*  
LT1083/4/5 TA07  
LT1083/4/5 TA06  
*OPTIONAL IMPROVES RIPPLE REJECTION  
Low Dropout Negative Supply  
Battery Backed Up Regulated Supply  
5.2V LINE  
5.0V BATTERY  
V
IN  
LT1084-5  
+
IN LT1084-12 OUT  
GND  
V
IN  
10μF  
50Ω  
SELECT  
FOR  
CHARGE  
RATE  
+
+
100μF  
10,000μF  
V
= –12V  
OUT  
LT1084-5  
LT1083/4/5 TA08  
FLOATING INPUT  
+
+
6.5V  
10μF  
100μF  
LT1083/4/5 TA09  
RELATED PARTS  
PART NUMBER  
DESCRIPTION  
COMMENTS  
50μA Quiescent Current  
LT1129  
700mA Micropower Low Dropout Regulator  
LT1175  
500mA Negative Low Dropout Micropower Regulator  
4.5A, 500kHz Step-Down Converter  
45μA I , 0.26V Dropout Voltage, SOT-223 Package  
4.5A, 0.07Ω Internal Switch, SO-8 Package  
500mV Dropout Voltage  
Q
LT1374  
LT1529  
3A Low Dropout Regulator with 50μA I  
Q
LT1573  
UltraFastTM Transient Response Low Dropout Regulator  
UltraFast Transient Response Low Dropout Regulator  
7A, Very Low Dropout Regulator  
Drives External PNP  
LT1575  
Drives External N-Channel MOSFET  
LT1580  
0.54V Dropout at 7A, Fixed 2.5V  
and Adjustable  
OUT  
LT1581  
10A, Very Low Dropout Regulator  
0.63V Dropout at 10A, Fixed 2.5V  
and Adjustable  
OUT  
LT1584/85/87  
LT1735  
7A/4.6A/3A Fast Response LDOs  
Fast Transient Response for Microprocessor Applications  
High Efficiency, OPTI-LOOPTM Compensation  
Synchronous Step-Down Converter  
LT1761 Series  
LT1762 Series  
LT1763 Series  
LT1764  
100mA, Low Noise, Low Dropout Micropower Regulators in SOT-23 20μA Quiescent Current, 20μV  
Noise, SOT-23 Package  
Noise, MSOP Package  
Noise, SO-8 Package  
RMS  
RMS  
RMS  
150mA, Low Noise, LDO Micropower Regulators  
500mA, Low Noise LDO Micropower Regulators  
3A Low Noise Fast Transient Response LDO  
300mA, Low Noise LDO Micropower Regulator  
1.5A, Low Noise, Fast Transient Response LDO  
25μA Quiescent Current, 20μV  
30μA Quiescent Current, 20μV  
40μV  
20μV  
40μV  
Noise, 5-Lead DD Package  
Noise, MSOP Package  
RMS  
RMS  
RMS  
LT1962  
LT1963  
Noise, SOT-223 Package  
UltraFast and OPTI-LOOP are trademarks of Linear Technology Corporation.  
1083ffd  
LT 1007 REV D • PRINTED IN USA  
LinearTechnology Corporation  
1630 McCarthy Blvd., Milpitas, CA 95035-7417  
12  
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com  
© LINEAR TECHNOLOGY CORPORATION 1994  

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