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LM234 Datasheet

THREE TERMINAL ADJUSTABLE CURRENT SOURCES

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LM234 pdf
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
DE SC RI P TI O N
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 +25oC and is directly propor-
tionalto the absolute temperature (oK). The simplest
external resistor connection generates a current
with 0.33%/oC temperature dependence. Zero
drift can be obtainedby adding an additionalresistor
and a diode to the external circuit.
Z
TO92
(Plastic Package)
D
SO8
(Plastic Micropackage)
ORDER CODES
Part Num-
ber
Temperature
Range
LM134
LM234
LM334
–55oC, +125oC
–25oC, +100oC
0oC, +70oC
Example : LM134Z
PIN CONNECTIONS
TO92
(Bottom view)
V + AD J
21
V-
3
SO8
(Top view)
NC NC V- NC
8 76 5
Package
ZD
••
••
••
October 1997
1 23 4
ADJ NC NC V+
1/10


STMicroelectronics Electronic Components Datasheet

LM234 Datasheet

THREE TERMINAL ADJUSTABLE CURRENT SOURCES

No Preview Available !

LM234 pdf
LM134-LM234-LM334
SCHEMATIC DIAGRAM
Q4 Q5
V
Q6
Q3
C1
50pF
Q2
Q1
ADJ
V
ABSOLUTE MAXIMUM RATING
Symbol
VADJ-
ISET
Ptot
Tstg
Toper
Parameter
Voltage V + to V
Forward
Reverse
ADJ Pin to V Voltage
Set Current
Power Dissipation
Storage Temperature Range
Operating Free-air Temperature Range
LM134
LM234
LM334
LM134 - LM234
LM334
40 30
20 20
55
10 10
400 400
–65 to +150
–55 to +125
–25 to +100
0 to +70
Unit
V
V
mA
mW
oC
oC
2/10


Part Number LM234
Description THREE TERMINAL ADJUSTABLE CURRENT SOURCES
Maker STMicroelectronics
Total Page 10 Pages
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