Maker : STMicroelectronics
Part No. : LM334D

  Datasheet PDF : LM334D.pdf
  Cross Reference : LM334D Cross Reference
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Shortcut : LM334  LM334  LM334  LM334D  LM334H  LM334M  LM334MX  LM334S8  LM334SM  LM334SMX  LM334Z  LM334Z 

Product Information

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 Z TO92 (Plastic Package) 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 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 current of several microamperes. This enables the circuit to operate as a rectifier and as a source of current in a.c. applications. For the LM134/LM234/LM334, the voltage on the control pin is 64mV at +25oC and is directly proportionalto 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. PIN CONNECTIONS TO92 (Bottom view) NC D SO8 (Plastic Micropackage) ORDER CODES Part Number LM134 LM234 LM334 Example : LM134Z Temperature Range –55oC, +125oC –25 C, +100 C 0 C, +70 C o o o o Package Z • • • D • • • SO8 (Top view) NC 8 V+ 2 7 V6 NC 5 AD J 1 V - 3 1 ADJ 2 NC 3 NC 4 V+ October 1997 1/10 LM134-LM234-LM334 SCHEMATIC DIAGRAM V Q4 Q5 Q6 Q3 C1 50pF Q2 Q1 ADJ V ABSOLUTE MAXIMUM RATING Symbol Voltage V to V Forward Reverse VADJISET Ptot Tstg Toper Set Current Power Dissipation Storage Temperature Range Operating Free-air Temperature Range LM134 LM234 LM334 + – Parameter LM134 - LM234 40 20 5 10 400 –65 to +150 –55 to +125 –25 to +100 0 to +70 LM334 30 20 5 10 400 Unit V ADJ Pin to V – Voltage V mA mW o o C C 2/10 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 V Current 10µA ≤ ISET ≤ 1mA 1mA ≤ ISET ≤ 5mA 2µA ≤ ISET ≤ 10µA Minimum Operating Voltage 2µA ≤ ISET ≤ 100µA 100µA ≤ ISET ≤ 1mA 1mA ≤ ISET ≤ 5mA Average change in set current with input voltage 2µA ≤ ISET ≤ 1mA + +1.5V ≤ V ≤ +5V +5V ≤ V+ ≤ +40V 1mA ≤ ISET ≤ 5mA + +1.5V ≤ V + ≤ +5V + +5V ≤ V ≤ +40V Temperature Dependence of set current - (note 2) 25µA ≤ ISET ≤ 1mA Effective Shunt Capacitance Notes : – + LM134 - LM234 Min. Typ. Max. 3 5 8 14 18 14 14 0.8 0.9 1 23 14 Min. LM334 Typ. Max. 6 8 12 18 14 14 0.8 0.9 1 26 Unit % V %/V 0.02 0.01 0.03 0.02 0.96 T T 15 1.04 T 0.96 T 0.05 0.03 0.02 0.01 0.03 0.02 T 15 1.04 T pF 0.1 0.05 1. Set current is the current flowing into theV + pin. It is determined by the following formula Iset = 67.7mV/Rset (T j = +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 LM134-LM234-LM334 4/10 LM134-LM234-LM334 APPLICATION HINT SLEW RATE At slew rates above a threshold (see curve) the LM134, LM234, LM334 can have a non-linear current characteristic. The slew rate at which this takes place is directly proportional to Iset. At Iset = 10µA, dv/dt max. = 0.01V/µS ; at Iset = 1mA, dv/dt max. = 1V/µS. Slew rates of more than 1V/µS do not damage the circuit nor do they produce high currents. THERMAL EFFECTS Internal heating can have a significant effect on current regulation for an Iset above 100µA. For example, each increase of 1V in the voltage across the LM134 at Iset = 1mA will increase the junction temperature by ≈ 0.4oC (in still air). The output current (Iset) has a temperature coefficient of about 0.33%/oC. Thus the change in current due to the in...

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