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Description

he BCR420U/BCR421U monolithically integrates a transistor, 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 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 < 40V.

With the low-side control, the BCR421U has an Enable (EN) pin which can be pulse-width modulated (PWM) up to 10 kHz by a micro controller for LED dimming.

With no need for additional external components, this CCR is fully integrated into a SOT26 minimizing PCB area and component count.

Application

Constant Current Regulation (CCR) in:
  • Automotive Interior Lighting
  • Emergency Lighting
  • Signage, Advertising, Decorative and Architectural Lighting
  • Retail Lighting in Fridges, Freezer Cases and Vending Machines

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
  • Vout = 40V Supply Voltage
  • Pd up to 1W in SOT26 (SC-74)
  • Negative temperature coefficient (NTC) reduces IOUT with increasing temperature
  • Parallel Devices to Increase Regulated Current
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device
  • Qualified to AEC-Q101 Standards for High Reliability

Product Specifications

Product Parameters

Qualified to AECQ10x Yes
Automotive Compliant PPAP BCR421UW6Q
Topology Linear LED Driver
Minimum Supply Voltage 1.4 V
Maximum Supply Voltage 40 V
Maximum VOUT 40 V
Number of Channels 1
LED Current Sense Voltage 700 mV
Output Current 350 mA
LED Current 10 Preset mA
Accuracy 10 %
Dimming Micro PWM controlled
Temperature Range -55 to 150 °C

Related Content

Packages
SOT26 (SC74R)

Technical Documents

SPICE Model

Calculators

Recommended Soldering Techniques

TN1.pdf

RoHS CofC

Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
BCR421UW6-7 Arrow Electronics Central EU 3000 8/11/2020 Buy Now Germany
BCR421UW6-7 Digi-Key Electronics 297034 8/11/2020 Buy Now United States
BCR421UW6-7 Farnell, An Avnet Company 6000 8/11/2020 Buy Now England
BCR421UW6-7 Farnell, An Avnet Company 13679 8/11/2020 Buy Now England
BCR421UW6-7 Mouser Electronics Inc. 37993 8/11/2020 Buy Now United States
BCR421UW6-7 Rutronik GmbH 6000 8/11/2020 Buy Now Germany
BCR421UW6-7 Future Electronics 6000 8/10/2020 Buy Now Canada
BCR421UW6-7 Future Electronics - Asia 69000 8/10/2020 Singapore
BCR421UW6Q-7 Avnet EU 3000 8/11/2020 Buy Now Germany
BCR421UW6Q-7 Arrow Electronics 171000 8/11/2020 Buy Now United States
BCR421UW6Q-7 Digi-Key Electronics 168831 8/11/2020 Buy Now United States
BCR421UW6Q-7 Farnell, An Avnet Company 2901 8/11/2020 Buy Now England
BCR421UW6Q-7 Mouser Electronics Inc. 7014 8/11/2020 Buy Now United States
BCR421UW6Q-7 RS Components 680 8/11/2020 Buy Now England
BCR421UW6Q-7 RS Components Ltd. 420 8/11/2020 Buy Now Japan
BCR421UW6Q-7 Future Electronics - Asia 39000 8/10/2020 Singapore
BCR421UW6Q-7 Future Electronics - Europe 6000 8/10/2020 England