BCR420UFDQ / BCR421UFDQ
LINEAR LED CONSTANT CURRENT REGULATOR IN U-DFN2020-6
Description
These Linear LED drivers are designed to meet the stringent
requirements of automotive applications.
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.
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.
Features
LED Constant Current Regulator Using NPN Emitter-Follower with
Emitter Resistor to Current Limit
I
OUT
– 10mA ±10% Constant Current (Preset)
I
OUT
up to 350mA Adjustable with an External Resistor
(BCR421U)
V
OUT
– 40V Supply Voltage
P
D
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 I
OUT
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)
Mechanical Data
Case: U-DFN2020-6
Case Material: Molded Plastic. “Green” Molding Compound.
UL Flammability Rating 94V-0
Moisture Sensitivity: Level 1 per J-STD-020
Terminals: Finish - NiPdAu, Solderable per MIL-STD-202, Method
208
e4
Weight: 0.018 grams (Approximate)
Applications
Constant Current Regulation (CCR) in automotive LED lighting:
Interior and Exterior Automotive LED Lighting
Dome and Mood Lighting
Puddle Lighting
Side Marker Lights
Edge Lighting Strips
EN
OUT
BCR420U
BCR421U
Pin Name
OUT
N/C
GND
EN
OUT
N/C
Top View
Pin-Out
Rext
Rext
EN
GND
N/C
Pin Function
Regulated Output Current
Enable for Biasing
Transistor
External Resistor for
Adjusting Output Current
Power Ground
Not Connected Internally
U-DFN2020-6
Rext
(Optional)
GND
Bottom View
Internal Device
Schematic
Ordering Information
(Note 5)
Part Number
BCR420UFDQ-7
BCR421UFDQ-7
Notes:
Compliance
Automotive
Automotive
Marking
420
421
Reel Size (inches)
7
7
Tape Width (mm)
8
8
Quantity Per Reel
3,000
3,000
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/.
BCR420UFDQ / BCR421UFDQ
Document number: DS39535 Rev. 3 - 2
1 of 13
www.diodes.com
January 2018
© Diodes Incorporated
BCR420UFDQ / BCR421UFDQ
Marking Information
xxx
xxx = Part Marking (See Ordering Information)
Y = Year: 0~9
W = Week: A~Z: 1~26 week;
a~z; 27~52 week; z represents
52 and 53 week
Absolute Maximum Ratings
(Voltage relative to GND, @T
A
= +25° unless otherwise specified.)
C,
Characteristic
Enable Voltage
Output Current
Output Voltage
Reverse Voltage Between all Terminals
BCR420U
BCR421U
Symbol
V
EN
I
OUT
V
OUT
V
R
Value
40
18
500
40
0.5
Unit
V
mA
V
V
Thermal Characteristics
(@T
A
= +25° unless otherwise specified.)
C,
Characteristic
Power Dissipation
Thermal Resistance, Junction to Ambient
Thermal Resistance, Junction to Lead
Recommended Operating Junction Temperature Range
Maximum Operating Junction and Storage Temperature Range
(Note 6)
(Note 7)
(Note 6)
(Note 7)
(Note 8)
Symbol
P
D
R
θJA
R
θJL
T
J
T
J
, T
STG
Value
1.7
1.3
75
100
35
-55 to +150
-65 to +150
Unit
W
°
C/W
°
C/W
°
C
ESD Ratings
(Note 9)
Characteristic
Electrostatic Discharge – Human Body
Model
Electrostatic Discharge – Machine Model
Notes:
Symbol
BCR420U
BCR421U
BCR420U
BCR421U
HBM
MM
Value
700
1000
300
400
Unit
V
V
V
V
JEDEC Class
1B
1C
B
C
6. For a device mounted with the OUT leads on 50mm x 50mm 1oz copper that is on a single-sided 1.6mm FR-4 PCB; device is measured under still
air conditions while operating in steady-state.
7. Same as Note 6, except mounted on 25mm x 25mm 1oz copper.
8. R
θJL
= Thermal resistance from junction to solder-point (at the end of the OUT leads).
9. Refer to JEDEC specification JESD22-A114 and JESD22-A115
.
BCR420UFDQ / BCR421UFDQ
Document number: DS39535 Rev. 3 - 2
2 of 13
www.diodes.com
January 2018
© Diodes Incorporated
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