LM337
1.5 A, Adjustable Output,
Negative Voltage Regulator
The LM337 is an adjustable 3−terminal negative voltage regulator
capable of supplying in excess of 1.5 A over an output voltage range of
−1.2 V to − 37 V. This voltage regulator is exceptionally easy to use
and requires only two external resistors to set the output voltage.
Further, it employs internal current limiting, thermal shutdown and
safe area compensation, making it essentially blow−out proof.
The LM337 serves a wide variety of applications including local, on
card regulation. This device can also be used to make a programmable
output regulator, or by connecting a fixed resistor between the
adjustment and output, the LM337 can be used as a precision current
regulator.
Features
http://onsemi.com
THREE−TERMINAL
ADJUSTABLE NEGATIVE
VOLTAGE REGULATOR
MARKING
DIAGRAMS
•
•
•
•
•
•
•
•
Output Current in Excess of 1.5 A
Output Adjustable between −1.2 V and −37 V
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting Constant with Temperature
Output Transistor Safe−Area Compensation
Floating Operation for High Voltage Applications
Eliminates Stocking many Fixed Voltages
Available in Surface Mount D
2
PAK and Standard 3−Lead Transistor
Package
•
Pb−Free Packages are Available
1
D
2
PAK
D2T SUFFIX
CASE 936
LM
337yyyy
AWLYWWG
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
Pin 1. Adjust
2. V
in
3. V
out
Standard Application
I
PROG
+
R
2
R
1
120
I
Adj
+
TO−220AB
T SUFFIX
CASE 221AB
C
O
**
1.0
mF
Heatsink surface
connected to Pin 2.
1
C
in
*
1.0
mF
LM
337xx
AWLYWWG
V
in
−V
in
LM337
V
out
−V
out
*C
in
is required if regulator is located more than 4 inches from power supply filter.
*
A 1.0
mF
solid tantalum or 10
mF
aluminum electrolytic is recommended.
**C
O
is necessary for stability. A 1.0
mF
solid tantalum or 10
mF
aluminum electrolytic
**
is recommended.
V out
+
–1.25 V 1
)
R2
R1
xx
yyyy
A
WL
Y
WW
G
= BT, T
= BD2T, D2T
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
©
Semiconductor Components Industries, LLC, 2006
1
August, 2006 − Rev. 6
Publication Order Number:
LM337/D