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CL2
Simple 90V, 20mA, Temperature Compensated,
Constant-Current LED Driver IC
Features
• 5.0 to 90V operating range (VA-B)
• 20 mA ±10% at 5.0 - 90V
• 0.01%/°C typical temperature coefficient
• Available in TO-243AA (SOT-89), TO-252(D-
PAK), & TO-92 packages
• Can be paralleled for higher current
Applications
• LED driver
• Industrial lamp indicators
• Signage
• Accent lighting
• Automotive
• Constant current source
• Constant current sink
Package Type
Description
CL2 is a high voltage, temperature compensated, con-
stant-current source. The device is trimmed to provide
a constant current of 20 mA ±10% at an input voltage
of 5–90V. 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 20 mA. Multiple CL2s can also be
used in parallel to provide higher currents such as
40 mA, 60 mA or 80 mA. The device is available in TO-
243AA (SOT-89), TO-252 (D-PAK), and TO-92 pack-
ages.
VB
VA
TO-92
NC
See Table 2-1 for pin information
VB
N/C
VA
TO-252 (D-PAK)
VB
N/C
VB
VA
TO-243AA (SOT-89)
2015 Microchip Technology Inc.
DS20005448A-page 1

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CL2
Typical Application Circuit
Up to 90V
+ VLED(total)
100nF
ILED
<20mA
VA
CL2
Functional Circuit
Diagram
VA
VB
+
Control Circuit
and Temperature
Compensation
VLED(total)
-
VB
DS20005448A-page 2
2015 Microchip Technology Inc.

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CL2
1.0 ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
Operating voltage, VA-B........................................................................................................................................... 100V
Operating junction temperature, Tj........................................................................................................... -40 to +125 °C
Storage Temperature, Ts .......................................................................................................................... -55 to +150 °C
† Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at those or any other conditions above those indicated in the
operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods
may affect device reliability.
DC AND AC CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, for all specifications TA = +25°C
Parameter
Symbol
Min Typ Max Units Conditions
Operating voltage
Current regulation
IA-B temperature coefficient
Operating junction temperature
Dynamic resistance
VA-B
IA-B
IA-B/T
Tj
RA-B
5.0 - 90 V ---
18.0 20
22 mA VA-B= 5.0V - 90V
- 0.01 - %/°C VA-B= 45V, Tj= -40°C to +100°C
-40 - 125 °C ---
- 300 -
k---
TEMPERATURE SPECIFICATIONS
Parameter
Symbol
Min Typ
Temperature Ranges
Operating Junction Temperature
Storage Temperature
Package Thermal Resistances
Tj -40 –
Ts -55 –
Thermal Resistance, TO-92
θja – 132
Thermal Resistance, TO-252
θja – 81
Thermal Resistance, TO-243AA θja – 133
Note 1: Mounted on FR4 board, 25mm x 25mm x 1.57 mm
Max Units Conditions
125 °C
150 °C
– °C/W
– °C/W Note 1
– °C/W Note 1
TABLE 1-1: THERMAL CHARACTERISTICS
Package
TO-92
TO-252
TO-243AA
Power Dissipation
@TA = 2.5°C (W)
0.6
2.0
1.3
Note 1: Mounted on FR4 board, 25mm x 25mm x 1.57 mm
Conditions
Note 1
Note 1
2015 Microchip Technology Inc.
DS20005448A-page 3

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CL2
2.0 PIN DESCRIPTION
The locations of the pins are listed in Package Type
and Packaging Information.
TABLE 2-1: PIN DESCRIPTION
Pin # TO-92
Pin # TO-252 Pin # To-243AA
111
233
3 4 2,4
Symbol
VA
NC
VB
Function
Current in
No connect
Current out
DS20005448A-page 4
2015 Microchip Technology Inc.

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CL2
3.0 FUNCTIONAL DESCRIPTION
Figure 3-1 provides the Functional Circuit diagram and
its equivalent block diagram for CL2. Performance
information is available in Figure 3-2 and Figure 3-3.
Figure 3-4 and Figure 3-5 provide example schemat-
ics.
VA VA
Control Circuit
and Temperature
Compensation
20mA
±10%
VB VB
Functional Circuit Diagram
Equivalent Block Diagram
FIGURE 3-1:
Functional Circuit Diagram and Equivalent Block Diagram
1.03
1.02
5.0V
45V
1.01
90V
1.00
0.99
0.98
-55 -35 -15
5 25 45 65 85 105 125 145
Temperature (°C)
FIGURE 3-2:
Temperature Characteristics
2015 Microchip Technology Inc.
DS20005448A-page 5