deliver up to 1.5A output current over an output voltage
range of –1.2V to –37V. Linear Technology has made
significant improvements in these regulators compared to
previous devices, such as better line and load regulation,
and a maximum output voltage error of 1%.
Every effort has been made to make these devices easy
to use and difficult to damage. Internal current and power
limiting coupled with true thermal limiting prevents device
damage due to overloads or shorts, even if the regulator
is not fastened to a heat sink.
Maximum reliability is attained with Linear Technology’s
advanced processing techniques combined with a 100%
burn-in in the thermal limit mode. This assures that all
device protection circuits are working and eliminates field
failures experienced with other regulators that receive only
standard electrical testing.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Guaranteed 1% Initial Voltage Tolerance
Guaranteed 0.01%/V Line Regulation
Guaranteed 0.5% Load Regulation
Guaranteed 0.02%/W Thermal Regulation
100% Burn-in in Thermal Limit
APPLICATIONS
n
n
n
n
Adjustable Power Supplies
System Power Supplies
Precision Voltage/Current Regulators
On-Card Regulators
TYPICAL APPLICATION
Negative Regulator
12
R2*
C2
5μF
SOLID
TANTALUM
V
IN
11
C3
1μF
SOLID
TANTALUM
–V
OUT
= 1.25V 1 +
R2
R1
OUTPUT VOLTAGE ERROR (%)
Output Voltage Error
1% RESISTORS
2% RESISTORS
+
+
10
9
8
7
6
5
4
3
2
1
0
1
2
4 6 8 10
20
40
OUTPUT VOLTAGE (V)
100
137A TA01b
ADJ
LT137A V
OUT
R1
121Ω
LM337
–V
IN
LT337A
137A TA01
*R2 = R1
|
V
OUT
|
1.25V
–1
137afb
1
LT137A/LM137
LT337A/LM337
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PRECONDITIONING
100% Thermal Limit Burn-In
Power Dissipation .......................…….Internally Limited
Input to Output Voltage Differential ..................…….40V
Operating Junction Temperature Range
LT137A/LM137 .................................. –55°C to 150°C
LT337A/LM337 ...................................... 0°C to 125°C
Storage Temperature Range
LT137A/LM137 .................................. –65°C to 150°C
LT337A/LM337 .................................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec.) ................. 300°C
PIN CONFIGURATION
BOTTOM VIEW
V
OUT
2
CASE
IS V
IN
1
ADJ
K PACKAGE
2-LEAD TO-3 METAL CAN
θ
JA
= 35°C/W,
θ
JC
= 3°C/W
Consider the M and T Packages for Alternate Source
3
1
2
V
OUT
BOTTOM VIEW
ADJ
CASE IS INPUT
V
IN
H PACKAGE
3-LEAD TO-39 METAL CAN
θ
JA
= 150°C/W,
θ
JC
= 15°C/W
Consider the M and T Packages for Alternate Source
FRONT VIEW
OBSOLETE PACKAGE
FRONT VIEW
3
OBSOLETE PACKAGE
TAB IS
INPUT
V
OUT
V
IN
ADJ
TAB
IS
INPUT
3
2
1
V
OUT
V
IN
ADJ
2
1
M PACKAGE
3-LEAD PLASTIC DD
θ
JA
= 30°C/W,
θ
JC
= 3°C/W
T PACKAGE
3-LEAD PLASTIC TO-220
θ
JA
= 50°C/W,
θ
JC
= 4°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT337AM#PBF
LT337AT#PBF
LM337T#PBF
LEAD BASED FINISH
LT337AM
LT337AT
TAPE AND REEL
LT337AM#TRPBF
LT337AT#TRPBF
LM337T#TRPBF
TAPE AND REEL
LT337AM#TR
LT337AT#TR
PART MARKING*
LT337AM
LT337AT
LM337T
PART MARKING*
LT337AM
LT337AT
PACKAGE DESCRIPTION
3-Lead Plastic DD
3-Lead Plastic TO-220
3-Lead Plastic TO-220
PACKAGE DESCRIPTION
3-Lead Plastic DD
3-Lead Plastic TO-220
TEMPERATURE RANGE
0°C to 125°C
0°C to 125°C
0°C to 125°C
TEMPERATURE RANGE
0°C to 125°C
0°C to 125°C
137afb
2
LT137A/LM137
LT337A/LM337
ORDER INFORMATION
LEAD BASED FINISH
LM337T
TAPE AND REEL
LM337T#TR
PART MARKING
LM337T
PACKAGE DESCRIPTION
3-Lead Plastic TO-220
TEMPERATURE RANGE
0°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 2, 3)
LT137A
SYMBOL PARAMETER
V
REF
Reference Voltage
CONDITIONS
MIN
l
–1.220
ELECTRICAL CHARACTERISTICS
LM137
MAX
MIN
TYP
MAX
UNITS
V
V
TYP
|
V
IN
– V
OUT
|
= 5V, I
OUT
= 10mA, T
j
= 25°C
3V ≤
|
V
IN
– V
OUT
|
≤ 40V
10mA ≤ I
OUT
≤ I
MAX
, P ≤ P
MAX
10mA ≤ I
OUT
≤ I
MAX
, (Note 4)
T
j
= 25°C,
|
V
OUT
|
≤ 5V
T
j
= 25°C,
|
V
OUT
|
≥ 5V
–1.238 –1.250 –1.262 –1.225 –1.250 –1.275
–1.250 –1.280 –1.200 –1.250 –1.300
ΔV
OUT
ΔI
OUT
Load Regulation
5
0.1
l
l
25
0.5
50
1
0.01
0.03
15
0.3
20
0.3
0.01
0.02
60
77
0.002
65
0.5
2
2.5
1.2
1.5
0.5
0.24
0.15
2.2
0.8
0.4
0.25
0.6
0.3
0.003
25
0.5
50
1
0.02
0.05
mV
%
mV
%
%/V
%/V
dB
dB
ΔV
OUT
ΔV
IN
Line Regulation
|
V
OUT
|
≤ 5V
|
V
OUT
|
≥ 5V
3V ≤
|
V
IN
– V
OUT
|
≤ 40V (Note 4)
T
j
= 25°C
V
OUT
= –10V, f = 120Hz
C
ADJ
= 0
C
ADJ
= 10μF
T
j
= 25°C, 10ms Pulse
10
0.2
0.005
0.01
60
70
66
80
0.002
l
Ripple Rejection
l
l
66
0.02
100
2
5
5
3
Thermal Regulation
I
ADJ
ΔI
ADJ
Adjust Pin Current
Adjust Pin Current Change
Minimum Load Current
I
SC
Current Limit
0.02
100
5
5
5
3
%/W
μA
μA
μA
mA
mA
A
A
A
A
%
65
0.2
1
2.5
1.2
1.5
0.5
0.24
0.15
2.2
0.8
0.4
0.25
0.6
0.3
0.003
12
2.3
10mA ≤ I
OUT
≤ I
MAX
3V ≤
|
V
IN
– V
OUT
|
≤ 40V
l
l
l
l
l
l
|
V
IN
– V
OUT
|
≤ 40V
|
V
IN
– V
OUT
|
≤ 10V
|
V
IN
– V
OUT
|
≤ 15V,
K and T Package (Note 7)
H Package
|
V
IN
– V
OUT
|
= 40V,
K and T Package
T
j
= 25°C
H Package
ΔV
OUT
ΔTemp
ΔV
OUT
ΔTime
e
n
θ
JC
Temperature Stability of
Output Voltage (Note 6)
Long Term Stability
RMS Output Noise
(% of V
OUT
)
Thermal Resistance Junction
to Case
T
MIN
≤ T ≤ T
MAX
T
A
= 125°C, 1000 Hours
T
A
= 25°C, 10Hz ≤ f ≤ 10kHz
H Package
K Package
l
1.5
1
1
%
%
15
3
12
2.3
15
3
°C/W
°C/W
137afb
3
LT137A/LM137
LT337A/LM337
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
REF
Reference Voltage
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 2, 3)
LT337A
MIN
l
–1.220
LM337
MAX
MIN
TYP
MAX
UNITS
V
V
TYP
|
V
IN
– V
OUT
|
= 5V, I
OUT
= 10mA, T
j
= 25°C
3V ≤
|
V
IN
– V
OUT
|
≤ 40V
10mA ≤ I
OUT
≤ I
MAX
, P ≤ P
MAX
10mA ≤ I
OUT
≤ I
MAX
, (Notes 4 and 5)
T
j
= 25°C,
|
V
OUT
|
≤ 5V
T
j
= 25°C,
|
V
OUT
|
≥ 5V
–1.238 –1.250 –1.262 –1.213 –1.250 –1.287
–1.250 –1.280 –1.200 –1.250 –1.300
ΔV
OUT
ΔI
OUT
Load Regulation
5
0.1
l
l
25
0.5
50
1
0.01
0.03
15
0.3
20
0.3
0.01
0.02
60
77
0.003
65
0.5
2
2.5
1
1.5
0.5
0.15
0.1
2.2
0.8
0.4
0.17
0.6
0.3
0.003
50
1
70
1.5
0.04
0.07
mV
%
mV
%
%/V
%/V
dB
dB
ΔV
OUT
ΔV
IN
Line Regulation
|
V
OUT
|
≤ 5V
|
V
OUT
|
≥ 5V
3V ≤
|
V
IN
– V
OUT
|
≤ 40V (Note 4)
T
j
= 25°C
V
OUT
= –10V, f = 120Hz
C
ADJ
= 0
C
ADJ
= 10μF
T
j
= 25°C, 10ms Pulse
10
0.2
0.005
0.01
60
70
66
80
0.002
l
Ripple Rejection
l
l
66
0.02
100
2
5
5
3
Thermal Regulation
I
ADJ
ΔI
ADJ
Adjust Pin Current
Adjust Pin Current Change
Minimum Load Current
I
SC
Current Limit
0.04
100
5
5
10
6
%/W
μA
μA
μA
mA
mA
A
A
A
A
%
65
0.2
1
2.5
1.2
1.5
0.5
0.24
0.15
2.2
0.8
0.5
0.25
0.6
0.3
0.003
12
2.3
3
10mA ≤ I
OUT
≤ I
MAX
3V ≤
|
V
IN
– V
OUT
|
≤ 40V
l
l
l
l
l
l
|
V
IN
– V
OUT
|
≤ 40V
|
V
IN
– V
OUT
|
≤ 10V
|
V
IN
– V
OUT
|
≤ 15V,
K, M and T Package
H Package
|
V
IN
– V
OUT
|
= 40V,
K, M and T Package
T
j
= 25°C
H Package
ΔV
OUT
ΔTemp
ΔV
OUT
ΔTime
e
n
θ
JC
Temperature Stability of
Output Voltage (Note 6)
Long Term Stability
RMS Output Noise
(% of V
OUT
)
Thermal Resistance Junction
to Case
T
A
= 125°C, 1000 Hours
T
A
= 25°C, 10Hz ≤ f ≤ 10kHz
H Package
K Package
M and T Package
l
1.5
1
1
%
%
15
3
5
12
2.3
3
15
3
5
°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 2:
The shaded electrical specifications indicate those parameters
which have been improved or guaranteed test limits provided for the first
time.
Note 3:
Unless otherwise indicated, these specifications apply:
|
V
IN
– V
OUT
|
= 5V; and I
OUT
= 0.1A for the H package, I
OUT
= 0.5A for the K, M,
and T packages. Power dissipation is internally limited. However, these
specifications apply for power dissipation up to 2W for the H package and
20W for the K and T packages. I
MAX
= 1.5A for the K, M, and T packages,
and 0.2A for the H package.
Note 4:
Testing is done using a pulsed low duty cycle technique. See
thermal regulation specifications for output changes due to heating effects.
Load regulation is measured on the output pin at a point 1/8" below the
base of the K and H package and at the junction of the wide and narrow
portion of the lead on the M and T package.
Note 5:
Load regulation for the LT337AT is the same as for LM337T.
Note 6:
Guaranteed on LT137A and LT337A, but not 100% tested in
production.
Note 7:
I
SC
is tested at the ambient temperatures of 25°C and –55°C. I
SC
cannot be tested at the maximum ambient temperature of 150°C due to the
high power level required. I
SC
specification at 150°C ambient is guaranteed
by characterization and correlation to 25°C testing.
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