The TL4242-Q1 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 (QFN) 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 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.
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