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STMicroelectronics
STMicroelectronics

LM334D Datasheet

THREE TERMINAL ADJUSTABLE CURRENT SOURCES


LM334D Datasheet Preview


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
Page 1

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
Page 2

LM134-LM234-LM334
ELECTRICAL CHARACTERISTICS
Tj = +25oC with pulse testing so that junction temperature does not change during testing
(unless otherwise specified)
Parameter
Set Current Error (V+ = +2.5V) - (note 1)
10µA ISET 1mA
1mA ISET 5mA
2µA ISET 10µA
Ratio of Set Current to VCurrent
10µA ISET 1mA
1mA ISET 5mA
2µA ISET 10µA
LM134 - LM234
Min. Typ. Max.
3
5
8
14 18 23
14
14
LM334
Min. Typ. Max.
6
8
12
14 18 26
14
14
Unit
%
Minimum Operating Voltage
2µA ISET 100µA
100µA ISET 1mA
1mA ISET 5mA
V
0.8 0.8
0.9 0.9
11
Average change in set current with input voltage
2µA
ISET
+1.5V
1mA
V+
+5V
+5V V+ +40V
1mA ISET
+1.5V
5mA
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 - (note 2)
25µA ISET 1mA
0.96 T T 1.04 T 0.96 T T 1.04 T
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/Rset
(Tj = +25oC).
Set current error is expressed as a percent deviation from this amount.
2. Iset is directly proportional to absolute temperature (oK). Iset at any temperature can be calculated from
Iset = IO (T/TO) where IO is Iset measured at TO (oK).
3/10
Page 3
Part Number LM334D
Manufactur STMicroelectronics
Description THREE TERMINAL ADJUSTABLE CURRENT SOURCES
Total Page 10 Pages
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LM334 , LM334 , LM334 , LM334D , LM334H , LM334M , LM334MX , LM334S8 , LM334SM , LM334SMX , LM334Z , LM334Z ,

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