SGS Thomson Microelectronics LM334Z, LM334D, LM334, LM234Z, LM234 Datasheet

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 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 asa 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 absolutetemperature (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)

V+	ADJ	V -
2	1	3

Z

TO92

(Plastic Package)

D

SO8

(Plastic Micropackage)

ORDER CODES

Part Num-	Temperature
ber	Range
LM134	±55oC, +125oC
LM234	±25oC, +100oC
LM334	0oC, +70oC
Example : LM134Z

SO8

(Top view)

N C	N C	V-	N C
8	7	6	5

Package

ZD

••

••

••

1	2	3	4
ADJ	NC	NC	V+

October 1997

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LM134-LM234-LM334

SCHEMATIC DIAGRAM

V

Q4

Q5

Q6

Q3

C1 Q1

Q2

50pF

ADJ

V

ABSOLUTE MAXIMUM RATING

Symbol			Parameter		LM134 - LM234	LM334	Unit
	Voltage V + to V ±						V
	Forward				40	30
	Reverse				20	20
-	ADJ Pin to V	±	Voltage		5	5	V
VADJ
ISET	Set Current				10	10	mA
Ptot	Power Dissipation				400	400	mW
Tstg	Storage Temperature Range				±65 to +150		oC
Toper	Operating Free-air Temperature Range			LM134	±55 to +125		oC
				LM234	±25 to +100
				LM334	0 to +70

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LM134-LM234-LM334

ELECTRICAL CHARACTERISTICS

Tj = +25oC with pulse testing so that junction temperature does not change during testing (unless otherwise specified)

				Parameter	LM134 - LM234				LM334	Unit
					Min.	Typ.	Max.	Min.	Typ.
										Max.
Set Current Error (V+ = +2.5V) - (note 1)										%
10μA ≤ ISET ≤ 1mA							3			6
1mA	≤ ISET ≤		5mA				5			8
2μA	≤ ISET ≤		10μA				8			12
Ratio of Set Current to V± Current
10μA ≤ ISET ≤ 1mA					14	18	23	14	18	26
1mA	≤ ISET ≤		5mA			14			14
2μA	≤ ISET ≤		10μA			14			14
Minimum Operating Voltage										V
2μA	≤ ISET ≤		100μA			0.8			0.8
100μA ≤ ISET ≤				1mA		0.9			0.9
1mA	≤ ISET ≤		5mA			1			1
Average change in set current with input voltage										% / V
2μA	≤ ISET ≤		1mA
	+1.5V	≤	V+	≤ +5V		0.02	0.05		0.02	0.1
	+5V ≤	V+ ≤		+40V		0.01	0.03		0.01	0.05
1mA ≤ ISET ≤ 5mA
	+1.5V	≤ V+		+ ≤ +5V		0.03			0.03
	+5V ≤	V+ ≤		+40V		0.02			0.02
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).

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