BCR420UW6-7 LED Lighting Drivers AD8626ARMZ-REEL PCA9450CHNY Linear Semiconductors

Description

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 preset10mA nominal that can be adjusted with an external resistor up to350mA. It is designed for driving LEDs in strings and will reducecurrent 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 microcontroller
for LED dimming.

With no need for additional external components, this CCR is fully integrated into an SOT26 (SC74R) minimizing PCB area and
component count.

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 (BCR421U)
 VOUT – 40V Supply Voltage
 PD up to 1W in SOT26 (SC74R)
 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
 Automotive-Compliant Parts are Available Under Separate
Datasheet (BCR420UW6Q/BCR421UW6Q)

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