STMicroelectronics LM134, LM234, LM334 Technical data
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■ OPERATES FROM 1V TO 40V
■ 0.02%/V CURRENT REGULATION
■ PROGRAMMABLE FROM 1µA TO 10mA
■ ±3% INITIAL ACCURACY
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 t 10V
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 so urce of
current in a.c. applications.
For the LM134/LM234/LM33 4, the voltage on the
control pin is 64m V at +25°C and is direct ly pro-
portional to the absolute temperature (°K). The
simplest external resistor conn ection ge nerates a
current with ≈ 0.33%/°C temperature dependence.
Zero drift can be obtained by adding an additional
resistor and a diode to the external circuit.
ORDER CODE
Z = TO92 Plastic package - also available in Bulk (Z), Tape & Reel (ZT)
and Ammo Pack (AP)
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
PIN CONNECTIONS (top view)
Part Number
Temperature
Range
Package
ZD
LM134 -55°C, +125°C
••
LM234 -25°C, +100°C
••
LM334 0°C, +70°C
••
Z
TO92
(Plastic Package)
D
SO8
(Plastic Micropacka ge)
ADJ
v+
v-
21
3
8765
1234
NC NC
V-
NC
ADJ
NC
NC
V+
TO92
(Top view)
SO8
(Top view)
LM134
LM234 - LM334
THREE TERMINAL ADJUSTABLE CURRENT SOURCES
May 2003
LM134 - LM234 - LM334
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SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter LM134 LM234 LM334 Unit
Voltage V+ to V-
Forward
Reverse
40
20
30
20
V
V
ADJ
-
ADJ Pin to V
-
Voltage
5V
I
SET
Set Current 10 mA
P
tot
Power Dissipation 400 mW
T
Stg
Storage Temperature Range -65 to +150 °C
Toper Operating Free-air Temperature Range -55 to +125 -25 to +100 0 to +70 °C
LM134 - LM234 - LM334
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ELECTRICAL CHARACTERISTICS
Tj = +25°C with pulse testing so that junction temperature does not change during testing (unless
otherwise specified)
Parameter
LM134 - LM234 LM334
Unit
Min. Typ. Max. Min. Typ. Max.
Set Current Error (V
+
= +2.5V) -
1)
10µA
≤
I
SET
≤
1mA
1mA
≤
I
SET
≤
5mA
2µA
≤
I
SET
≤
10µA
1. Set current is the current flowing into the V+ pin. It is determined by the following formula Iset = 67.7mV/Rset (Tj = +25°C)
Set curren t e rror is expressed as a percent devi at i on from this am ount
3
5
8
6
8
12
%
Ratio of Set Current to V
-
Current
10µA
≤
I
SET
≤
1mA
1mA
≤
I
SET
≤
5mA
2µA
≤
I
SET
≤
10µA
14 18
14
14
23 14 18
14
14
26
Minimum Operating Voltage
2µA
≤
I
SET
≤
100µA
100µA
≤
I
SET
≤
1mA
1mA
≤
I
SET
≤
5mA
0.8
0.9
1
0.8
0.9
1
V
Average Change in Set Current with Input Voltage
2µA
≤
I
SET
≤
1mA
+1.5V
≤
V
+
≤
+5V
+5V
≤
V
+
≤
+40V
1mA
≤
I
SET
≤
5mA
+1.5V
≤
V
+
≤
+5V
+5V
≤
V
+
≤
+40V
0.02
0.01
0.03
0.02
0.05
0.03
0.02
0.01
0.03
0.02
0.1
0.05 % / V
Temperature Dependence of set current -
2)
25µA
≤
I
SET
≤
1mA
2. Iset is directly propor tional to ab solute temperature (° K). Iset at any t em perature can be calculated from I set = Io (T/To) where Io is Iset
measured a t To (°K)
0.96 T T 1.04 T 0.96 T T 1.04 T
Effective Shunt Capacitance 15 15 pF
LM134 - LM234 - LM334
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