LED driver with multiple 250mA output, 12 bits dimming with serial control

electroled · ‎2025-11-19

Hello,

For a lighting application, I am looking for a multiple outputs IC capable of 250 mA per output (or summing several outputs to reach that current), allowing low level dimming (12 bits dimming minimum).

It has to include serial communication to be controlled by an MCU. The MCU will control many block of LEDs.

Any help is appreciated,

Thanks,

TDK · ‎2025-11-19

Any MCU can do the communication part. You will need a separate LED driver circuit that supports PWM or dimming.

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Andrew Neil · ‎2025-11-19

ST's LED driver range is here:

https://www.st.com/en/power-management/led-drivers.html

Other manufacturers & Distributors often have parametric search tools on their websites

Try your favourite internet search engine ...

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A complex system designed from scratch never works and cannot be patched up to make it work.

unsigned_char_array · ‎2025-11-19

You don't need an IC other than an MCU (and maybe an opamp). You can directly control a buck or boost converter circuit from software using ADC and PWM pins. Certainly for fixed loads. There are application notes for this.

Microchip has one:
https://ww1.microchip.com/downloads/en/Appnotes/01047a.pdf

There's no reason you can't use an STM32 for this.

ST has several. This is one I found (mains powered with PFC):
https://www.st.com/resource/en/application_note/an5230-75-w-digitally-controlled-constant-current-hb-led-driver-stmicroelectronics.pdf

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electroled · ‎2025-11-25

Thanks to all of you for your replies