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BCR421UW6

10mA-350mA, Adjustable, SOT26

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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.

Feature(s)

  • 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

Application(s)

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

Specifications & Technical Documents

Product Parameters

AEC Qualified No
Compliance (Only Automotive Supports PPAP) Standard
Topology Linear LED Driver
Minimum Supply Voltage (V) 1.4 V
Maximum Supply Voltage (V) 40 V
Maximum VOUT (V) 40 V
Number of Channels 1
LED Current Sense Voltage (mV) 700 mV
Low Dropout VSAT (mV) 950@10mA (Typ) mV
Output Current (mA) 350 mA
Channel Max. Output Current (mA) 10 Preset mA
Accuracy (%) 10 %
Control Interface/Protocols N/A
Diagnosis & Protection N/A
Dimming (Analog) N/A
Dimming (PWM) Micro PWM controlled
Temperature Range (°C) -55 to 150 °C
Moisture Sensitivity Level (MSL) 1

Related Content

Packages

Technical Documents

SPICE Model

Calculators

Recommended Soldering Techniques

TN1.pdf

RoHS CofC

Purchase & Availablity

Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2495 2021-03-31 2021-07-01 Qualification of Additional Assembly & Test Sites and Additional Wafer Back Grinding and Back Metal Process
Source for Select Discrete Products