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National Semiconductor
National Semiconductor

LM334 Datasheet

3-Terminal Adjustable Current Sources


LM334 Datasheet Preview


March 2000
LM134/LM234/LM334
3-Terminal Adjustable Current Sources
General Description
The LM134/LM234/LM334 are 3-terminal adjustable current
sources featuring 10,000:1 range in operating current, excel-
lent current regulation and a wide dynamic voltage range of
1V to 40V. Current is established with one external resistor
and no other parts are required. Initial current accuracy is
±3%. The LM134/LM234/LM334 are true floating current
sources with no separate power supply connections. In addi-
tion, reverse applied voltages of up to 20V will draw only a
few dozen microamperes of current, allowing the devices to
act as both a rectifier and current source in AC applications.
The sense voltage used to establish operating current in the
LM134 is 64mV at 25˚C and is directly proportional to abso-
lute temperature (˚K). The simplest one external resistor
connection, then, generates a current with +0.33%/˚C tem-
perature dependence. Zero drift operation can be obtained
by adding one extra resistor and a diode.
Applications for the current sources include bias networks,
surge protection, low power reference, ramp generation,
LED driver, and temperature sensing. The LM234-3 and
LM234-6 are specified as true temperature sensors with
guaranteed initial accuracy of ±3˚C and ±6˚C, respectively.
These devices are ideal in remote sense applications be-
cause series resistance in long wire runs does not affect ac-
curacy. In addition, only 2 wires are required.
The LM134 is guaranteed over a temperature range of
−55˚C to +125˚C, the LM234 from −25˚C to +100˚C and the
LM334 from 0˚C to +70˚C. These devices are available in
TO-46 hermetic, TO-92 and SO-8 plastic packages.
Features
n Operates from 1V to 40V
n 0.02%/V current regulation
n Programmable from 1µA to 10mA
n True 2-terminal operation
n Available as fully specified temperature sensor
n ±3% initial accuracy
Connection Diagrams
SO-8
Surface Mount Package
SO-8 Alternative Pinout
Surface Mount Package
TO-46
Metal Can Package
DS005697-24
Order Number LM334M or
LM334MX
See NS Package Number M08A
DS005697-25
Order Number LM334SM or
LM334SMX
See NS Package Number M08A
TO-92 Plastic Package
DS005697-12
VPin is electrically connected to case.
Bottom View
Order Number LM134H,
LM234H or LM334H
See NS Package
Number H03H
DS005697-10
Bottom View
Order Number LM334Z, LM234Z-3 or LM234Z-6
See NS Package Number Z03A
© 2000 National Semiconductor Corporation DS005697
www.national.com
Page 1

Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V+ to VForward Voltage
LM134/LM234/LM334
LM234-3/LM234-6
V+ to VReverse Voltage
R Pin to VVoltage
Set Current
Power Dissipation
ESD Susceptibility (Note 6)
Operating Temperature Range (Note 5)
LM134
40V
30V
20V
5V
10 mA
400 mW
2000V
−55˚C to +125˚C
LM234/LM234-3/LM234-6
−25˚C to +100˚C
LM334
0˚C to +70˚C
Soldering Information
TO-92 Package (10 sec.)
260˚C
TO-46 Package (10 sec.)
300˚C
SO Package
Vapor Phase (60 sec.)
215˚C
Infrared (15 sec.)
220˚C
See AN-450 “Surface Mounting Methods and Their Effect on
Product Reliability” (Appendix D) for other methods of sol-
dering surface mount devices.
Electrical Characteristics (Note 2)
Parameter
Set Current Error, V+=2.5V,
(Note 3)
Ratio of Set Current to
Bias Current
Minimum Operating Voltage
Average Change in Set Current
with Input Voltage
Temperature Dependence of
Set Current (Note 4)
Effective Shunt Capacitance
Conditions
10µA ISET 1mA
1mA < ISET 5mA
2µA ISET < 10µA
100µA ISET 1mA
1mA ISET 5mA
2 µAISET100 µA
2µA ISET 100µA
100µA < ISET
1mA
1mA < ISET 5mA
2µA ISET 1mA
1.5 V+ 5V
5V V+ 40V
1mA < ISET 5mA
1.5V V 5V
5V V 40V
25µA ISET 1mA
LM134/LM234
Min Typ Max
3
5
8
14 18 23
14
18 23
0.8
0.9
1.0
0.02 0.05
0.01 0.03
0.03
0.02
0.96T T 1.04T
LM334
Min Typ Max
6
8
12
14 18 26
14
18 26
0.8
0.9
1.0
0.02 0.1
0.01 0.05
0.03
0.02
0.96T T 1.04T
15 15
Units
%
%
%
V
V
V
%/V
%/V
%/V
%/V
pF
Note 1: .“Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Note 2: Unless otherwise specified, tests are performed at Tj = 25˚C with pulse testing so that junction temperature does not change during test
Note 3: Set current is the current flowing into the V+ pin. For the Basic 2-Terminal Current Source circuit shown on the first page of this data sheet. ISET is determined
by the following formula: ISET = 67.7 mV/RSET (@ 25˚C). Set current error is expressed as a percent deviation from this amount. ISET increases at 0.336%/˚C @ Tj
= 25˚C (227 µV/˚C).
Note 4: ISET is directly proportional to absolute temperature (˚K). ISET at any temperature can be calculated from: ISET = Io (T/To) where Io is ISET measured at To
(˚K).
Note 5: For elevated temperature operation, TJ max is:
LM134
LM234
LM334
150˚C
125˚C
100˚C
Thermal Resistance
θja (Junction to Ambient)
θjc (Junction to Case)
TO-92
180˚C/W (0.4" leads)
160˚C/W (0.125" leads)
N/A
TO-46
440˚C/W
32˚C/W
SO-8
165˚C/W
80˚C/W
Note 6: Human body model, 100pF discharged through a 1.5kresistor.
www.national.com
2
Page 2

Electrical Characteristics (Note 2)
Parameter
Conditions
Set Current Error, V+=2.5V,
(Note 3)
Equivalent Temperature Error
Ratio of Set Current to
Bias Current
Minimum Operating Voltage
Average Change in Set Current
with Input Voltage
Temperature Dependence of
Set Current (Note 4) and
Equivalent Slope Error
Effective Shunt Capacitance
100µA ISET
1mA
TJ = 25˚
100µA ISET
1mA
100µA ISET 1mA
100µA ISET
1mA
1.5 V+ 5V
5V V+ 30V
100µA ISET
1mA
LM234-3
Min Typ Max
±1
±3
14 18 26
0.9
0.02 0.05
0.01 0.03
0.98T T 1.02T
±2
15
LM234-6
Min Typ Max
±2
±6
14 18 26
0.9
0.02 0.01
0.01 0.05
0.97T T 1.03T
±3
15
Units
%
˚C
V
%/V
%/V
%
pF
3 www.national.com
Page 3

Typical Performance Characteristics
Output Impedance
Maximum Slew Rate
Linear Operation
Start-Up
DS005697-30
Transient Response
DS005697-31
Voltage Across RSET (VR)
DS005697-32
Current Noise
DS005697-33
DS005697-34
www.national.com
4
DS005697-35
Page 4
Part Number LM334
Manufactur National Semiconductor
Description 3-Terminal Adjustable Current Sources
Total Page 14 Pages
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