LM134-LM234
LM334
THREE TERMINAL ADJUSTABLE CURRENT SOURCES
.
.
.
.
OPERATES from 1V to 40V
0.02% V CURRENT REGULATION
PROGRAMMABLE from 1µA to 10mA
±3%
INITIAL ACCURACY
Z
TO92
(Plastic Package)
DESCRIPTION
The LM134/LM234/LM334 are 3-terminal adjust-
able current sources characterized by :
- an operating current range of 10000 : 1
- an excellent current regulation
- a wide dynamic voltage range of 1V to 40V
The current is determined by an external resistor
without requiring other external components.
Reverse voltages of up to 20V will only draw a cur-
rent of several microamperes. This enables the
circuit to operate as a rectifier and as a source of cur-
rent in a.c. applications.
For the LM134/LM234/LM334, the voltage on the
control pin is 64mV at +25
o
C and is directly propor-
tionalto the absolute temperature (
o
K). The simplest
external resistor connection generates a current
with
≈
0.33%/
o
C temperature dependence. Zero
drift can be obtainedby adding an additionalresistor
and a diode to the external circuit.
PIN CONNECTIONS
TO92
(Bottom view)
NC
D
SO8
(Plastic Micropackage)
ORDER CODES
Part Num-
ber
LM134
LM234
LM334
Example :
LM134Z
Temperature
Range
–55
o
C, +125
o
C
–25 C, +100 C
0 C, +70 C
o
o
o
o
Package
Z
•
•
•
D
•
•
•
SO8
(Top view)
NC
8
V+
2
7
V-
6
NC
5
AD J
1
V
-
3
1
ADJ
2
NC
3
NC
4
V+
October 1997
1/10
STMICROELECTRONICS [ STMICROELECTRONICS ]
