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Description

This Linear LED driver is designed to meet the stringent requirements of automotive applications.

The BCR421UW6Q monolithically integrates transistors, diodes and resistors to function as a Constant Current Regulators (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 the low-side control, the BCR421UW6Q has an Enable (EN) Pin which can be pulse-width modulated (PWM) up to 10 kHz by a microcontroller for LED dimming.

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

Application

  • Constant Current Regulation (CCR) in:
    • Automotive Interior Lighting
    • Mood and Decorative Lighting

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)
  • Low-Side Control Enabling PWM Input < 10kHz
  • 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
  • PPAP Capable

Product Specifications

Product Parameters

Qualified to AECQ10x Yes
Automotive Compliant PPAP Yes
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 PWM by external transistor
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
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 Future Electronics - Asia 39000 8/10/2020 Singapore
BCR421UW6Q-7 Future Electronics - Europe 6000 8/10/2020 England
BCR421UW6Q-7 RS Components 680 8/10/2020 Buy Now England
BCR421UW6Q-7 RS Components Ltd. 420 8/10/2020 Buy Now Japan