SGS Thomson Microelectronics LM334Z, LM334D, LM334, LM234Z, LM234 Datasheet
...
THREETERMINAL ADJUSTABLECURRENT SOURCES
.OPERATESfrom1V to 40V
.0.02%V CURRENT REGULATION
.PROGRAMMABLEfrom1µAto10mA
.±3% INITIALACCURACY
DESC RIP TI ON
The LM134/LM234/LM334 are 3-terminal adjustable currentsourcescharacterizedby :
-an operatingcurrent rangeof 10000 : 1
-an excellentcurrentregulation
-a widedynamicvoltage range of 1V to 40V
The current is determined by an external resistor
withoutrequiringother externalcomponents.
Reversevoltagesof up to 20V will only draw a current of several microamperes. This enables the
circuittooperateasa rectifierandasasourceofcurrentin a.c. applications.
For the LM134/LM234/LM334,the voltage on the
controlpin is 64mV at+25
tionaltotheabsolutetemperature(
external resistor connection generates a current
with ≈ 0.33%/
o
C temperature dependence. Zero
driftcanbeobtainedbyaddinganadditionalresistor
and a diode to theexternalcircuit.
o
C and is directlypropor-
o
K).Thesimplest
LM134-LM234
(Plastic Package)
(PlasticMicropackage)
ORDER CODES
Part Num-
ber
LM134 –55
LM234 –25
LM334 0
Example : LM134Z
LM334
Z
TO92
D
SO8
Temperature
Range
o
C, +125oC ••
o
C, +100oC ••
o
C, +70oC ••
Package
ZD
PIN CONNECTIO N S
TO92
(Bottomview)
ADJ
-
V
3
+
V
21
October1997 1/10
SO8
(Topview)
NC NC
8765
1234
ADJ NC NC
-
V NC
+
V
LM134-LM234-LM334
SCHEMA TIC DIAG RAM
Q3
V
Q4 Q5 Q6
C1
Q1
Q2
50pF
ADJ
V
ABSOLUTE MAXIMUM RATING
Symbol Parameter LM134 - LM234 LM334 Unit
Voltage V
-
V
ADJ
I
SET
P
T
T
ADJ Pin to V–Voltage 5 5 V
Set Current 10 10 mA
Power Dissipation 400 400 mW
tot
Storage Temperature Range –65 to +150
stg
Operating Free-air Temperature Range LM134
oper
Forward
Reverse
+
to V
–
LM234
LM334
40
20
–55 to +125
–25 to +100
0 to +70
30
20
V
o
C
o
C
2/10
LM134-LM234-LM334
ELECTRICAL CHARACTERISTICS
= +25oC with pulsetesting so that junction temperature does not change during testing
T
j
(unless otherwise specified)
Parameter
+
Set Current Error (V
10µA ≤ I
1mA ≤ I
2µA ≤ I
SET
SET
SET
Ratio of Set Current to V
10µA ≤ I
1mA ≤ I
2µA ≤ I
SET
SET
SET
= +2.5V) - (note 1)
≤ 1mA
≤ 5mA
≤ 10µA
≤ 1mA
≤ 5mA
≤ 10µA
–
Current
Minimum Operating Voltage
SET
SET
SET
≤ 100µA
≤ 1mA
≤ 5mA
2µA ≤ I
100µA ≤ I
1mA ≤ I
Average change in set current with input voltage
2µA ≤ I
1mA ≤ I
≤ 1mA
SET
+1.5V ≤ V
+5V ≤ V
≤ 5mA
SET
+1.5V ≤ V
+5V ≤ V
+
+
≤ +40V
+
+
≤ +40V
≤ +5V
+ ≤ +5V
Temperature Dependence of set current - (note 2)
25µA ≤ I
≤ 1mA 0.96 T T 1.04 T 0.96 T T 1.04 T
SET
Effective Shunt Capacitance 15 15 pF
Notes : 1. Set current is the current flowing into theV+pin. It is determined by the following formula Iset = 67.7mV/R
(Tj=+25oC).
Set current error is expressed as a percent deviation from this amount.
is directly proportional to absolute temperature (oK). I
2. I
set
I
(T/TO) where IOis Iset measured at TO(oK).
set=IO
LM134 - LM234 LM334
Min. Typ. Max. Min. Typ. Max.
14 18
14
14
0.8
0.9
0.02
0.01
0.03
0.02
at any temperature can be calculated from
set
3
5
8
23 14 18
14
14
0.8
0.9
1
0.05
0.03
1
0.02
0.01
0.03
0.02
6
8
12
26
0.1
0.05
set
Unit
%
V
%/V
3/10
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