LM337.PDF
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LM337 3-Terminal 1.5A Negative Adjustable Regulator
www.fairchildsemi.com
LM337
3-terminal 1.5A negative adjustable regulator
Features
• Output current In excess of 1.5A
• Output voltage adjustable between -1.2V and - 37V
• Internal thermal-overload protection
• Internal short-circuit current limiting
• Output transistor safe-area compensation
• Floating operation for high-voltage applications
• Standard 3-pin TO-220 package and D
2
PA K
Description
The LM337 is a 3-terminal negative adjustable regulator. It
supply in excess of 1.5A over an output voltage range of -
1.2V to - 37V. This regulator requires only two external
resistor to set the output voltage. Included on the chip are
current limiting, thermal overload protection and safe area
compensation.
TO-220
1
D
2
-PAK
1
1. Adj 2. Input 3. Output
Internal Block Diagram
Vadj
1
3
Output
Voltage
Reference
-
+
Protection
Circuitry
2
Input
Rev. 5.0
©2000 Fairchild Semiconductor International
LM337
Absolute Maximum Ratings
Parameter
Symbol
Value
Unit
Input-Output Voltage Differential
V
I
- V
O
40
V
Power Dissipation
P
D
Internally limited
W
Operating Temperature Range
T
OPR
0 ~ +125
C
Storage Temperature Range
TSTG
-65 ~+125
C
Electrical Characteristics
(V
I
- V
O
= 5V, I
O
= 40mA, 0
C
TJ
125
C, PDMAX = 20W, unless otherwise specified)
Parameter
Symbol
Conditions
Min
Typ.
Max. Unit
T
A
= +25
C
-
0.01
0.04
- 40V
V
O
- V
I
-3V
%/ V
Line Regulation
R
line
- 40V
V
O
- V
I
-3V
-
0.02
0.07
TA = +25
C
-
15
50
Load Regulation
R
load
10mA
I
O
0.5A
mV
10mA
I
O
1.5A
-
15
150
Adjustable Pin Current
I
ADJ
-
-
50
100
A
TA =+ 25
C
Adjustable Pin Current
I
ADJ
10mA
I
O
1.5A
-
2
5
A
- 40V
V
O
- V
I
-3V
T
A
=+ 25
C
-1.213 -1.250 -1.287
Reference Voltage
V
REF
- 40V
V
O
- V
I
-3V
-1.200 -1.250 -1.300
V
10mA
I
O
1.5A
Temperature Stability
ST
T
-
-
0.6
-
%
Minimum Load Current to Maintain
Regulation
- 40V
VO - VI
-3V
-
2.5
10
- 10V
V
O
- V
I
-3V
-
1.5
6
mA
Output Noise
en
T
A
=+25
C 10Hz
f
10KHz
-
3
V
OUT
-
/
6
Ripple Rejection Ratio
V
O
= -10V, f = 120Hz
-
60
-
C
ADJ
= 10
F
66
77
-
dB
Long Term Stability
ST
TJ = 125
C ,1000Hours
-
0.3
1
%
Thermal Resistance Junction to
Case
R
JC
-
-
4
-
C/ W
• Load and line regulation are specified at constant junction temperature. Change in V
O due to heating effects
must be taken into
account separately. Pulse testing with low duty is used.
2
LM337
Typical Application
I
PROG
R
2
Ci
0. 1
+
+
Co
1
F
I
adj
R
1
F
Vadj
-V
I
VI
KA337
Vo
-V
o
Figure 1. Programmable Regulator
• Ci is required if regulator is located more then 4 inches from power supply filter.
A 1.0
F solid tantalum or 10
F aluminum electrolytic
is recommended.
•V
O
= -1.25V (1+R
2
/R
1
)
3
LM337
F aluminum electrolytic is recommended.
Co is necessary for stability. A 1.0
F solid tantalum or 10
LM337
Mechanical Dimensions
Package
TO-220
9.90
±
0.20
4.50
±
0.20
(8.70)
ø3.60
±
0.10
1.30
+0.10
–0.05
1.27
±
0.10
1.52
±
0.10
0.80
±
0.10
0.50
+0.10
2.40
±
–0.05
0.20
2.54TYP
[2.54
±
2.54TYP
[2.54
±
0.20
]
0.20
]
10.00
±
0.20
4
LM337
Mechanical Dimensions
(Continued)
Package
D
2
-PAK
9.90
±
0.20
4.50
±
0.20
1.30
+0.10
–0.05
0.10
±
0.15
2.40
±
0.20
1.27
±
0.10
0.80
±
0.10
2.54 TYP
2.54 TYP
0.50
+0.10
–0.05
10.00
±
0.20
(8.00)
(4.40)
10.00
±
0.20
(2XR0.45)
0.80
±
0.10
5
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