![](http://datasheet.mmic.net.cn/230000/IP137_datasheet_15585788/IP137_4.png)
IG–Pack
G–Pack
(TO–257) (TO–220)
Part
Number
LM137
LM137HV
LM137A
LM137AHV
IP137
IP137HV
IP137A
IP137AHV
LM337
LM337HV
IP337
IP337HV
IP337A
IP337AHV
K–Pack
(TO–3)
R–Pack
(TO–66)
T–Pack
SG–Pack
SMD1
Temp.
Range
-55 to +150°C
”
”
”
-55 to +150°C
”
”
”
0 to 125°C
0 to 125°C
0 to 125°C
”
0 to 125°C
”
Prelim. 7/00
IP137
A
SERIES
IP137A SERIES
IP337
A
SERIES
IP337A SERIES
LM137
A
SERIES
LM137A SERIES
Semelab plc.
Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail:
sales@semelab.co.uk
http://www.semelab.co.ukR 3
1.5k
1 %
ADJ
IP337A
V
IN
V
OUT
R 1
1 k
1 %
R 2
1
μ
F
–
V
OUT
SOLID
TANTALUM
7V
*
–
V
IN
* R2 =
( )
V
9.08 x 10
-3
–
908
C 3
1 0
μ
F
R 2
ADJ
IP137A
V
IN
V
OUT
1N4002
R 1
–
V
IN
ADJ
IP137A
V
IN
V
OUT
1N4002
2
μ
F
C 1
1
μ
F
SOLID
–
V
OUT1
REG #1
2
μ
F
REG #2
1
μ
F
SOLID
OUT2
–
V
ADJ
IP137A
V
IN
V
OUT
1N4002
2
μ
F
REG #N
1
μ
F
SOLID
OUT N
–
V
AD J
IP337A
V
IN
V
OUT
1ND 2
–
V
OUT
IN
–
V
R5**
1 %
R 3
5 k
10
μ
F
V
IN
V
OUT
AD J
IP317A
R1**
1 %
10
μ
F
2.2
μ
F
2.2
μ
F
1ND 1
IN
+V
+V
OUT
R2
5k
1 %
R4
5k
1 %
ADJ
V
IN
V
OUT
(
–
)
I
(+)
C 1
1
μ
F
SOLID
IP337A
R
S
0.8
≤
≤
250
R
S
I = 65
μ
A +
1.25 V
S
Current Regulator
Dual Tracking Supply
APPLICATIONS INFORMATION
High Stability Regulator
The output stability, load regulation, line regulation, thermal
regulation, temperature drift, long term drift, and noise, can be
improved by a factor of 6.6 over the standard regulator
configuration. This assumes a zener has 20PPM/
°
C maximum
drift and about 10 times lower noise than the regulator.
Multiple Tracking Regulators
In the application shown below, regulator #2 to
“
N
”
will track
regulator #1 to within ±24mV initially, and to ±60mV over all load,
line, and temperature conditions.
If any regulator output is shorted to ground, all other
outputs will drop to -2V. Load regulation of regulators 2 to
“
N
”
will
be improved by V
OUT
/ 1.25V compared to a standard regulator,
so regulator #1 should be the one which has the lowest load
current.
* Solid Tantalum
** R1 or R5 may be trimmed slightly to improve tracking.
Order Information