BCR420UW6

BCR420UW6 / BCR421UW6 LINEAR LED CONSTANT CURRENT REGULATOR IN SOT26 Description The BCR420UW6 and BCR421UW6 monolithically integrate transistors, diodes, and resistors to function as a Constant Current Regulator (CCR) for linear LED driving. Each 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. With no need for additional external components, this CCR is fully integrated into the SOT26 package, minimizing PCB area and component count. Features  LED Constant Current Regulator using NPN Emitter-Follower with Emitter Resistor to Current Limit  IOUT – 10mA ± 10% Constant Current (Preset)  IOUT up to 350mA Adjustable with an External Resistor (BCR421U)  VOUT – 40V Supply Voltage  PD up to 1W in SOT26  Low-Side Control Enabling PWM Input < 25kHz (BCR421U)  Negative Temperature Coefficient (NTC) Reduces IOUT with Increasing Temperature  Parallel Devices to Increase Regulated Current  Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)  Halogen and Antimony Free. “Green” Device (Note 3)  Autom...