THREE TERMINAL ADJUSTABLE CURRENT SOURCES
LM134-LM234 LM334
THREE TERMINAL ADJUSTABLE CURRENT SOURCES
. . . .
OPERATES from 1V to 40V 0.02% V CURRENT REGULATION...
Description
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 adjustable 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 current of several microamperes. This enables the circuit to operate as a rectifier and as a source of current in a.c. applications. For the LM134/LM234/LM334, the voltage on the control pin is 64mV at +25oC and is directly proportionalto 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. PIN CONNECTIONS
TO92 (Bottom view)
NC
D SO8 (Plastic Micropackage)
ORDER CODES
Part Number LM134 LM234 LM334 Example : LM134Z Temperature Range –55oC, +125oC –25 C, +100 C 0 C, +70 C
o o o o
Package Z D
SO8 (Top view)
NC
8
V+
2
7
V6
NC 5
AD J
1
V
-
3
1 ADJ
2 NC
3 NC
4 V+
October 1997
1/10
LM134-LM234-LM334
SCHEMATIC DIAGRAM
V
Q4 Q5 Q6
Q3
C1 50pF
Q2
Q1
ADJ V
ABSOLUTE MAXIMUM RATING
Symbol Voltage V to V Forward Reverse VADJISET Ptot Tst...
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