STMicroelectronics LM134, LM234, LM334 Technical data
ADJ
v+
v-
21
3
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
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 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 current 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 proportional 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.
Z
TO92
(Plastic Package)
D
SO8
(Plastic Micropacka ge)
ORDER CODE
Part Number
LM134 -55°C, +125°C
LM234 -25°C, +100°C
LM334 0°C, +70°C
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)
Temperature
Range
Package
ZD
••
••
••
PIN CONNECTIONS (top view)
TO92
(Top view)
May 2003
SO8
(Top view)
NC NCV-NC
8765
1234
ADJNCNC
V+
1/11
LM134 - LM234 - LM334
SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter LM134 LM234 LM334 Unit
Voltage V+ to V-
Forward
Reverse
-
V
I
P
T
ADJ Pin to V- Voltage
ADJ
Set Current 10 mA
SET
Power Dissipation 400 mW
tot
Storage Temperature Range -65 to +150 °C
Stg
Toper Operating Free-air Temperature Range -55 to +125 -25 to +100 0 to +70 °C
40
20
30
20
5V
V
2/11
LM134 - LM234 - LM334
ELECTRICAL CHARACTERISTICS
Tj = +25°C with pulse testing so that junction temperature does not change during testing (unless
otherwise specified)
Parameter
Set Current Error (V
10µA ≤ I
1mA ≤ I
2µA ≤ I
Ratio of Set Current to V
10µA ≤ I
1mA ≤ I
2µA ≤ I
+
= +2.5V) -1)
≤ 1mA
SET
≤ 5mA
SET
≤ 10µA
SET
≤ 1mA
SET
≤ 5mA
SET
≤ 10µA
SET
Current
-
Minimum Operating Voltage
2µA ≤ I
100µA ≤ I
1mA ≤ I
≤ 100µA
SET
SET
≤ 5mA
SET
≤ 1mA
Average Change in Set Current with Input Voltage
2µA ≤ I
1mA ≤ I
Temperature Dependence of set current -
25µA ≤ I
≤ 1mA
SET
+1.5V ≤ V
+5V ≤ V
≤ 5mA
SET
+1.5V ≤ V
+5V ≤ V
≤ 1mA
SET
≤ +5V
+
≤ +40V
+
≤ +5V
+
≤ +40V
+
2)
Effective Shunt Capacitance 15 15 pF
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
3
5
8
23 14 18
1
0.05
0.03
14
14
0.8
0.9
1
0.02
0.01
0.03
0.02
6
8
12
26
0.1
0.05 % / V
0.96 T T 1.04 T 0.96 T T 1.04 T
Unit
%
V
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
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)
3/11
LM134 - LM234 - LM334
4/11
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