LED driver IC BCR431U

The constant current linear LED driver IC provides low-voltage drop performance for regulating LED current. It is the second device released in the new generation BCR family with low voltage drop focusing on low current designs of up to 37mA. Typical applications for the new BCR431U include LED strips, channel letters, architectural LED lighting, LED displays, as well as emergency, retail, and appliance lighting.

Infineon’s BCR431U is a linear LED driver IC in a small SOT23-6 package regulating the LED current in standalone operation without any external power transistor. The voltage drop at the integrated driver IC can go down to 105 mV at 15 mA. It improves the overall efficiency and provides the voltage headroom required to compensate for the LED forward voltage tolerances and variances in the supply voltage. The LED current is easily adjustable via a high ohmic resistor on a dedicated pin with an IC supply voltage ranging between 6 V and 42 V. For safe and reliable operation and to extend the overall LED system’s lifetime, a smart over-temperature controlling circuit keeps the current constant even at rising temperature. It reduces the LED current only when the junction temperature gets very high. The BCR431U features a dimming capability of down to 1 percent, which makes it attractive for a great variety of LED strip designs.