LM234Z-6 National Semiconductor, LM234Z-6 Datasheet

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LM234Z-6

Manufacturer Part Number
LM234Z-6
Description
Manufacturer
National Semiconductor
Datasheet

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© 2005 National Semiconductor Corporation
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
±
sources with no separate power supply connections. In ad-
dition, 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,
Connection Diagrams
V
3%. The LM134/LM234/LM334 are true floating current
Pin is electrically connected to case.
Order Number LM334M or LM334MX
See NS Package Number M08A
Surface Mount Package
Order Number LM134H,
LM234H or LM334H
Metal Can Package
See NS Package
Number H03H
Bottom View
TO-46
SO-8
00569712
00569724
DS005697
LED driver, and temperature sensing. The LM234-3 and
LM234-6 are specified as true temperature sensors with
guaranteed initial accuracy of
These devices are ideal in remote sense applications be-
cause series resistance in long wire runs does not affect
accuracy. 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
Order Number LM334Z, LM234Z-3 or LM234Z-6
Order Number LM334SM or LM334SMX
See NS Package Number M08A
See NS Package Number Z03A
Surface Mount Package
SO-8 Alternative Pinout
TO-92 Plastic Package
Bottom View
±
00569710
3˚C and
00569725
±
6˚C, respectively.
www.national.com
March 2005

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LM234Z-6 Summary of contents

Page 1

... Programmable from 1µA to 10mA n True 2-terminal operation n Available as fully specified temperature sensor ± 3% initial accuracy n Order Number LM334SM or LM334SMX See NS Package Number M08A Order Number LM334Z, LM234Z-3 or LM234Z-6 See NS Package Number Z03A DS005697 March 2005 ± ± 3˚C and 6˚C, respectively. ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. + − Forward Voltage LM134/LM234/LM334 LM234-3/LM234-6 + − Reverse Voltage − R Pin to V Voltage Set Current Power Dissipation ESD Susceptibility (Note 6) ...

Page 3

Electrical Characteristics Note directly proportional to absolute temperature (˚K). I SET (˚K). Note 5: For elevated temperature operation, T Thermal Resistance θ (Junction to ja Ambient) θ (Junction to Case) jc Note 6: Human body model, 100pF ...

Page 4

Typical Performance Characteristics Output Impedance Start-Up Voltage Across R www.national.com 00569730 00569732 (V ) SET R 00569734 4 Maximum Slew Rate Linear Operation 00569731 Transient Response 00569733 Current Noise 00569735 ...

Page 5

Typical Performance Characteristics Turn-On Voltage Application Hints The LM134 has been designed for ease of application, but a general discussion of design features is presented here to familiarize the designer with device characteristics which may not be immediately obvious. These ...

Page 6

Application Hints (Continued) regulation by at least an order of magnitude. DC character- istics (with the exception of minimum input voltage), are not affected. NOISE Current noise generated by the LM134 is approximately 4 times the shot noise of a ...

Page 7

Application Hints (Continued) The set current ( the sum of I SET 1 uting approximately 50% of the set current, and I usually included in the I term by increasing the V 1 used for calculations by 5.9%. ...

Page 8

Application Hints (Continued) If the forward voltage drop of the diode was 0.65V instead of the estimate of 0.6V (an error of 8%), the actual set current will be an error of less than 5%. If the estimate for the ...

Page 9

Typical Applications (Continued) *Select R1 and C1 for optimum stability Micropower Bias Higher Output Current 00569705 Basic 2-Terminal Current Source 00569701 Low Input Voltage Reference Driver 00569717 9 00569718 www.national.com ...

Page 10

Typical Applications 1.2V Reference Operates on 10 µA and 2V *Select ratio obtain zero temperature drift 1.2V Regulator with 1.8V Minimum Input *Select ratio for zero temperature drift www.national.com (Continued) Ramp ...

Page 11

Typical Applications (Continued) FET Cascoding for Low Capacitance and/or Ultra High Output Impedance *Select ensure at least 1V across the LM134 ≥ 1.2V SET DSS Generating Negative Output Impedance 00569723 ≈ −16 ...

Page 12

Schematic Diagram (Continued) www.national.com 00569711 12 ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM134H, LM234H or LM334H NS Package Number H03H SO Package (M) Order Number LM334M, LM334MX, LM334SM or LM334SMX NS Package Number M08A 13 www.national.com ...

Page 14

... Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Order Number LM334Z, LM234Z-3 or LM234Z-6 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. ...

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