1 Features
1• Qualified for Automotive Applications
• AEC-Q100 Test Guidance With the Following
Results:
– Device Temperature Grade 2: –40°C to 105°C
Ambient Operating Temperature Range for
WSON package
– Device Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature Range for
TO-263 package
– Device HBM ESD Classification Level H1C
– Device CDM ESD Classification Level C3B
• Adjustable Constant Current up to 500 mA (±5%)
• Wide Input-Voltage Range up to 42 V
• Low Dropout Voltage
• Open-Load Detection
• Overtemperature Protection
• Short-Circuit Proof
• Reverse-Polarity Proof

2 Applications
Automotive LED Lighting Applications Including:
• Rear Light
• Daytime Running Light
• Fog Light
• Position Light
• Interior Light
• Stop or Tail Light

3 Description
The TL4242-Q1 device is an integrated adjustable
constant-current source, driving loads up to 500 mA.
One can adjust the output current level through an
external resistor. The device design is for supplying
high-power LEDs (for example, OSRAM Dragon LA
W57B) under the severe conditions of automotive
applications, resulting in constant brightness and
extended LED lifetime. The device comes in the DRJ
(WSON) and KTT (TO-263) package. Protection
circuits prevent damage to the device in case of
overload, short-circuit, reverse polarity, and overheat.
The device provides the connected LEDs protection
against reverse polarity as well as excess voltages up
to 45 V.
The integrated PWM input of the TL4242-Q1 device
permits LED brightness regulation by pulse-width
modulation (PWM). The high-input impedance of the
PWM input allows operating the LED driver as a
protected high-side switch.