BCR420U BCR421U BCR420UFD / BCR421UFD LINEAR LED CONSTANT CURRENT REGULATOR IN U-DFN2020-6 Description Features The BCR420U and BCR421U monolithically integrate transistors, LED Constant Current Regulator Using NPN Emitter-Follower with diodes and resistors to function as a Constant Current Regulator Emitter Resistor to Current Limit I 10mA 10% Constant Current (Preset) (CCR) for linear LED driving. The device regulates with a preset OUT I up to 350mA Adjustable with an External Resistor 10mA nominal that can be adjusted with an external resistor up to OUT (BCR421U) 350mA. It is designed for driving LEDs in strings and will reduce V 40V Supply Voltage OUT current at increasing temperatures to self-protect. Operating as a P up to 1.7W in U-DFN2020-6 Package D series linear CCR for LED string current control, it can be used in 0.6mm Height for Low-profile Edge Lighting multiple applications, as long as the maximum supply voltage to the Low-Side Control Enabling PWM Input < 25kHz (BCR421U) device is < 40V. Negative Temperature Coefficient (NTC) Reduces I with OUT Increasing Temperature With the low-side control, the BCR421U has an Enable (EN) pin Parallel Devices to Increase Regulated Current which can be pulse-width modulated (PWM) up to 25kHz by a micro- Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) controller for LED dimming. Halogen and Antimony Free. Green Device (Note 3) Automotive-Compliant Parts are Available Under Separate With no need for additional external components, this CCR is fully Datasheet (BCR420UFDQ/BCR421UFDQ) integrated into a 2x2x0.6mm package (U-DFN2020-6) minimizing PCB area, off-board height, and component count. Mechanical Data Applications Case: U-DFN2020-6 Constant Current Regulation (CCR) in: Case Material: Molded Plastic. Green Molding Compound. UL Flammability Rating 94V-0 Moisture Sensitivity: Level 1 per J-STD-020 Edge Lighting Strips Terminals: Finish - NiPdAu, Solderable per MIL-STD-202, Method Emergency Lighting e4 Signage, Advertising, Decorative and Architectural Lighting 208 Retail Lighting in Fridges, Freezer Cases and Vending Machines Weight: 0.018 grams (Approximate) EN OUT Pin Name Pin Function U-DFN2020-6 OUT Regulated Output Current GND N/C Enable for Biasing Rext EN Transistor (Optional) Rext OUT External Resistor for Rext Adjusting Output Current N/C EN GND Power Ground GND N/C Not connected internally Top View Bottom View Internal Device Pin-Out Schematic Ordering Information (Note 4) Part Number Compliance Marking Reel Size (inches) Tape Width (mm) Quantity Per Reel BCR420UFD-7 Standard 420 7 8 3,000 BCR421UFD-7 Standard 421 7 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 BCR420UFD / BCR421UFD Marking Information xxx = Part Marking (See Ordering Information) xxx 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 = +25C, unless otherwise specified.) A Characteristic Symbol Value Unit BCR420U 40 Enable Voltage V V EN BCR421U 18 Output Current 500 mA I OUT Output Voltage 40 V V OUT Reverse Voltage Between all Terminals 0.5 V V R Thermal Characteristics ( T = +25C, unless otherwise specified.) A Characteristic Symbol Value Unit (Note 5) 1.7 Power Dissipation P W D (Note 6) 1.3 (Note 5) 75 Thermal Resistance, Junction to Ambient R C/W JA (Note 6) 100 Thermal Resistance, Junction to Lead (Note 7) 35 C/W R JL Recommended Operating Junction Temperature Range T -55 to +150 J C Maximum Operating Junction and Storage Temperature Range -65 to +150 T , T J STG ESD Ratings (Note 8) Characteristic Symbol Value Unit JEDEC Class BCR420U 700 V 1B Electrostatic Discharge Human Body HBM Model BCR421U 1000 V 1C BCR420U 300 V B Electrostatic Discharge Machine Model MM BCR421U 400 V C Notes: 5. 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. 6. Same as Note 5, except mounted on 25mm x 25mm 1oz copper. R = Thermal resistance from junction to solder-point (at the end of the OUT leads). 7. JL 8. Refer to JEDEC specification JESD22-A114 and JESD22-A115. 2 of 13 January 2018 BCR420UFD / BCR421UFD Diodes Incorporated www.diodes.com Document number: DS38588 Rev. 3 - 2