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BCR421UW6Q-7

DIOBCR421UW6Q-7

Diodes Incorporated
LED Driver IC 1 Output Linear PWM Dimming 350mA SOT-26
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Overview

The BCR421UW6Q-7 is an AEC-Q100 qualified linear LED driver designed to provide a constant current for LED strings. It supports an adjustable output current up to 350mA using an external resistor and features a low-side control topology that enables PWM dimming at frequencies up to 25kHz.

Why Choose This Part

The device features a negative temperature coefficient that automatically reduces output current as temperature rises, protecting the LEDs from thermal runaway. It is housed in a compact SOT-26 package capable of 1W power dissipation and allows for easy current scaling by paralleling multiple devices.

Applications

Automotive Interior Lighting
Ideal for ambient lighting, instrument clusters, and door handle illumination due to AEC-Q100 qualification.
Emergency Lighting
Used in battery-backed emergency exit signs and path markers requiring constant current regulation.
Signage and Advertising
Provides uniform brightness across LED strips in commercial displays and channel letters.
Decorative Architecture
Suitable for low-voltage architectural accent lighting where PWM dimming is required for mood setting.

Key Specifications

Type Linear
Dimming PWM
Applications Lighting
Mounting Type Surface Mount
Package / Case SOT-23-6
Voltage - Output 40V
Number of Outputs 1
Internal Switch(s) Yes
Operating Temperature -55degC ~ 150degC (TJ)
Voltage - Supply (Max) 18V
Supplier Device Package SOT-26
Current - Output / Channel 350mA

Getting Started

To set the target LED current, calculate the external Rext resistor value based on the desired output up to 350mA. Ensure the supply voltage stays below 18V while the output pin can withstand up to 40V for driving long LED series strings. Provide a PWM signal to the EN pin for dimming control, keeping the frequency below 25kHz for optimal performance.