SGS Thomson Microelectronics LM337SP, LM337K, LM237K, LM237SP, LM137K Datasheet
NEGATIVE VOLTAGE REGULATORS
.OUTPUT VOLTAGEADJUSTABLE DOWN TO
V
ref
.1.5A GUARANTEEDOUTPUT CURRENT
.0.3%/V TYPICAL LOAD REGULATION
.0.01%/VTYPICAL LINE REGULATION
.CURRENT LIMIT CONSTANT WITH TEM-
PERATURE
.RIPPLE REJECTION : 77dB
.STANDARD 3-LEAD TRANSISTOR PACK-
AGES
.EXCELLENT THERMAL REGULATION:
0.002%/V
.50ppm/°C TEMPERATURE COEFFICIENT
DESCRI PTIO N
The LM137 series are adjustable 3-terminal negative voltage regulators capable of supplying in excess-1.5Aovera -1.2to -37Voutput voltagerange.
Theyare exceptionally easy touse andrequireonly
two externalresistors to settheoutput voltage. Further, both line and load regulation are better than
standard fixed regulators. Also, LM137 regulators
aresupplied in standard transistor packages which
are easily mounted and handled. In addition to
higher performance than fixed regulators, the
LM137series offer fulloverload protectionavailable
only in integrated circuits. Included on the chip are
current limit, thermal overload protection and safe
area protection. All overload protection circuitryremainsfullyfunctionaleveniftheadjustment terminal
is disconnected.
LM137/LM237
LM337
THREE-TERMINAL ADJUSTABLE
TO-3
TO-220
TO-39
PIN CONNECTIONS
(bottomview)
1 - Output
2 - Adj
Case is input
March1993
TO-3
TO-39
(bottomview)
1 - Adj
2 - Output
3 - input
TO-220
(frontview)
1 - Adj
2 - Output
3 - Input
Heatsink surface connected to input
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LM137-LM237-LM337
ABSOLU TE MAXIMU M RAT ING
Symbol Parameter Value Unit
V
T
THERMA L CHA R ACTE R ISTI CS
Symbol Parameter Typ. Max. Unit
R
R
Input Output Voltage Differential 40 V
I-VO
Output Current TO-220/TO-3 1.5 A
I
O
TO-39 0.5
oper
LM137 -55 to 150
LM237 -25 to 150
LM337 0 to 125
T
stg
P
tot
Junction-case Thermal Resistance TO-3 4
thj-case
-65 to 150
Internally Limited W
TO-220 3
TO-39 15
Junction-ambient Thermal Resistance TO-3 35
thj-amb
TO-220 70
TO-39 160
o
o
C
o
C
o
C/W
C/W
ORDE R CODES
PART NUMBER TEMPERATURE
RANGE
LM137 -55 to 150
LM237 -25 to 150
LM337 0 to 125
PACKAGE
TO-3 TO-220 TO-39
o
C LM137K LM137H
o
C LM237K LM237SP LM237H
o
C LM337K LM337SP LM337H
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SCHEM ATIC D IAGRAM
LM137-LM237-LM337
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LM137-LM237-LM337
ELECTRIC AL CH A RAC TE RISI C S
LM137: -55oC<Tj<150oC
LM237: -25oC<Tj<150oC
LM337: 0oC<Tj<150oC
VI-VO=5V,IO= 0.5 A (unless ot herwis e specified)
Symbol Parameter LM137/LM237 LM337 Unit
Min. Typ. Max. Min. Typ. Max.
V
K
∆I
K
|I
O(min)
V
K
K
Notes : 1. Although power dissipation is internally limited, these specifications are applicable for power dissipation of :
Reference Voltage
ref
T
=25oC
amb
T
≤ Tj≤ T
min
3V ≤ |VI-VO|≤40V, 10mA ≤ |IO| ≤ |I
P ≤ P
K
Line Regulation
VI
(T
amb
max
O(max)
max
=25oC, 3V ≤ |VI-VO| ≤ 40V) - Note 2
|
IO= 0.1 A
IO=20mA
Load Regulation
VO
(T
=25oC, 10mA ≤ |IO| ≤ |I
amb
O(max)
|) - Note 2
|VO| ≤ 5V
|VO| ≥ 5V
Thermal Regulation (T
I
Adjustment Pin Current 65 100 65 100 µA
adj
Adjustment Pin Current Change
adj
(T
=25oC, 10mA ≤ |IO| ≤ |I
amb
=25oC, pulse 10 ms) 0.002 0.02 0.003 0.04 %/W
amb
|,
O(max)
-1.225
-1.2
-1.25
-1.275
-1.25
0.01
0.01
15
0.3
-1.3
0.02
0.02
25
0.5
-1.213
-1.2
-1.25
-1.25
0.01
0.01
15
0.3
-1.287
-1.3
0.04
0.04
50
1
25 25µA
3V ≤ |VI-VO| ≤ 40V)
Line Regulation (3V ≤ |VI-VO| ≤ 40V) - Note 2 0.02 0.05 0.02 0.07 %/V
K
VI
Load Regulation
VO
(10mA ≤ |IO| ≤ |I
|VO| ≤ 5V
|VO| ≥ 5V
O(max)
|) - Note 2
20
0.3
50
20
1
0.3701.5
| Minimum Load Current
|VI-VO| ≤ 40V
|VI-VO| ≤ 10V
I
Short Circuit Output Current
OS
|VI-VO| ≤ 15V (TO-3 and TO-220)
|VI-VO| ≤ 15V (TO-39)
|VI-VO| = 40V, Tj=25oC (TO-3 and TO-220)
|VI-VO| = 40V, Tj=25oC (TO-39)
RMS Output Noise (% of VO)
NO
T
=25oC, 10Hz ≤ f ≤ 10KHz
amb
R
Ripple Rejection Ratio
vf
1.5
0.5
0.24
0.15
VO= - 10 V, f = 120 Hz
C
=10µF66
adj
Temperature Stability 0.6 0.6 %
VT
Long Term Stability (T
VH
• 2W for TO-39
• 15W for TO-220
• 20W for TO-3 Package
I
is :
O(max)
• 1.5A for TO-3 and TO-220
• 0.5A for TO-39
2. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation.
= 125oC, 1000H) 0.3 1 0.3 1 %
amb
2.5
1.2
2.2
5
3
1.5
2.5
1.5
2.2
10
6
0.5
0.4
0.2
0.15
0.1
0.4
0.2
0.003 0.003 %
60
77 66
60
77
V
%/V
%/V
mV
%
mV
%
mA
mA
A
A
A
A
dB
dB
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LM137-LM237-LM337
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