BCR420UFDQ / BCR421UFDQ
LINEAR LED CONSTANT CURRENT REGULATOR IN U-DFN2020-6
Description
Features
These Linear LED drivers are designed to meet the stringent
requirements of automotive applications.
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)
The BCR420U and BCR421U monolithically integrate 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.
VOUT – 40V Supply Voltage
PD up to 1.7W in U-DFN2020-6 Package
0.6mm Height for Low-profile Edge Lighting
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)
Qualified to AEC-Q101 Standards for High Reliability
PPAP Capable (Note 4)
With the low-side control, the BCR421U has an Enable (EN) pin
which can be pulse-width modulated (PWM) up to 25kHz by a micro-
controller for LED dimming.
With no need for additional external components, this CCR is fully
integrated into a 2mm x 2mm x 0.6mm package (U-DFN2020-6)
minimizing PCB area, off-board height, and component count.
Mechanical Data
Case: U-DFN2020-6
Case Material: Molded Plastic. “Green” Molding Compound.
UL Flammability Rating 94V-0
Applications
Constant Current Regulation (CCR) in automotive LED lighting:
Moisture Sensitivity: Level 1 per J-STD-020
Terminals: Finish - NiPdAu, Solderable per MIL-STD-202, Method
Interior and Exterior Automotive LED Lighting
Dome and Mood Lighting
Puddle Lighting
e4
208
Weight: 0.018 grams (Approximate)
Side Marker Lights
Edge Lighting Strips
EN
OUT
Pin Name
Pin Function
U-DFN2020-6
OUT
GND
Regulated Output Current
N/C
OUT
N/C
Enable for Biasing
Transistor
Rext
(Optional)
EN
Rext
Rext
External Resistor for
Adjusting Output Current
EN
GND
Power Ground
GND
N/C
Not Connected Internally
Top View
Pin-Out
Bottom View
Internal Device
Schematic
Ordering Information (Note 5)
Part Number
BCR420UFDQ-7
BCR421UFDQ-7
Compliance
Automotive
Automotive
Marking
420
421
Reel Size (inches)
Tape Width (mm)
Quantity Per Reel
3,000
7
7
8
8
3,000
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
4. Automotive products are AEC-Q101 qualified and are PPAP capable. Refer to https://www.diodes.com/quality/.
5. For packaging details, go to our website at https://www.diodes.com/design/support/packaging/diodes-packaging/.
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www.diodes.com
January 2018
© Diodes Incorporated
BCR420UFDQ / BCR421UFDQ
Document number: DS39535 Rev. 3 - 2
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