1
Initial Release
Simple 90V 20mA Temperature Compensated
Constant Current LED Driver IC
Features
5.0V to 90V operating range (V
A-B
)
20mA 10% at 5-90V
0.01% / C Typical Temperature
Coefficient
TO-243AA (SOT-89), TO-252 (D-PAK),
& TO-92 packages
No external components (two terminal
device)
Can be paralleled for higher current
Applications
LED driver
Industrial lamp indicators
Signage
Accent lighting
Automotive
Constant current source
Constant current sink
Typical Application Circuit
General Description
The Supertex CL2 is a high voltage, temperature
compensated, constant current source. The device is
trimmed to provide a constant current of 20mA10%
at an input voltage of 5-90V. No external
components are required. The device can be used
as a two terminal constant current source or constant
current sink.
A typical application for the CL2 is to drive LEDs with
a constant current of 20mA. They can also be used
in parallel to provide higher currents such as 40mA,
60mA or 80mA. The device is available in SOT-89,
TO-252 (D-PAK), and TO-92 packages.
NR062905
CL2
I
LED
<20mA
V
A
V
B
CL2
Up to 90V
+ V
LED(total)
+
V
LED(total)
-
V
A
Control Circuit
and Temperature
Compensation
V
B
Functional Circuit Diagram
2
Package Options
Absolute Maximum Ratings*
V
A-B
, Operating Voltage
100V
T
J
, Operating Junction Temperature
-40C to +125C
Ts, Storage Temperature
-55C to +150C
*Absolute Maximum Ratings are those values beyond which damage to the device
may occur. Functional operation under these conditions is not implied. Continuous
operation of the device at the absolute rating level may affect device reliability.
Thermal Characteristics
Package
Power Dissipation
@
T
A
= 25C
JC
C/W
JA
C/W
TO-92 0.6W
125
170
TO-243AA (SOT-89)
1.3W*
15
78*
TO-252 (D-PAK)
2.0W*
6.0
50*
* Mounted on FR4 board; 25mm x 25mm x 1.57mm.
Ordering Information
Order Number / Package
TO-92 TO-243AA*
TO-252
CL2N3 CL2N8 CL2K4
*Same as SOT-89 product supplied on 2000 piece tape reels.
NR062905
CL2
NC = No Connect
TO-243A A
(SOT-89)
TO-25 2
(D-PAK)
V
A
NC
V
B
V
A
NC
V
B
(TO-92 )
V
A
NC V
B
V
B
3
Output Current vs. Voltage
Electrical Characteristics
(@ T
J
= 25C unless otherwise specified)
Symbol Parameter
Min Typ Max
Units Conditions
V
A-B
Maximum operating voltage
90
V
I
A-B
Current
regulation
18.0 20.0
22.0 mA
V
A-B
= 5-90V
I
A-B
/
T
I
A-B
temperature coefficient
0.01 %/C
V
A-B
= 45V,
T
J
= -40C to 100C
T
J
Operating junction temperature
-40
125
C
R
A-B
Dynamic
resistance
300k
NR062905
CL2
0
5
10
15
20
25
0
10
20
30
40
50
60
70
80
90
100
V
A-B
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