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
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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
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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
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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
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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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