BCR421UW6-7

BCR421UW6-7 is a linear LED constant current regulator. It monolithically integrates transistors, diodes, and resistors to function as a constant current regulator (CCR) for linear LED driving. The device regulates with a preset 10mA nominal that can be adjusted with an external resistor up to 350mA. It is designed for driving LEDs in strings and will reduce current at increasing temperatures to self-protect. Operating as a series linear CCR for LED string current control, it can be used in multiple applications, as long as the maximum supply voltage to the device is < 40V. With low-side control, the BCR421U has an Enable (EN) pin which can be pulse-width modulated (PWM) up to 25kHz by a microcontroller for LED dimming. The constant current regulation (CCR) in automotive interior lighting, emergency lighting, signage, advertising, and decorative/architectural lighting, retail lighting in fridges, freezer cases, and vending machines.

• LED constant current regulator using NPN emitter-follower with emitter resistor to current limit
• IOUT up to 350mA adjustable with an external resistor
• Negative temperature coefficient (NTC) reduces IOUT with increasing temperature
• Parallel devices to increase regulated current
• Collector-emitter breakdown voltage is 40V min at IC=1mA, TA=+25°C
• DC current gain is 350 ohm typ at IC=50mA; VCE=1V, TA=+25°C
• Voltage drop (VREXT) is 0.95V typ at IOUT=10mA, TA=+25°C
• Minimum output voltage is 1.4V typ at IOUT > 18mA, TA=+25°C
• SOT26 package
• Maximum operating junction and storage temperature range from -65 to +150°C