L99LD20/21 High-Power LED Drivers

By STMicroelectronics 126

L99LD20/21 High-Power LED Drivers

STMicroelectronics' L99LD20 is a fully integrated and flexible LED driver, which is specifically designed for the control of two independent high brightness LED strings for automotive front lighting applications. It consists of a dual buck converter.

STMicroelectronics' L99LD21 is a flexible LED driver is specifically designed for the control of two independent high brightness LED strings for automotive front lighting applications. It consists of a high-efficiency monolithic boost controller and a dual buck converter.

The integrated serial peripheral interface (SPI) offers a high level of flexibility making it possible to adjust device parameters (supporting generic platform approaches), control all operating modes, and read out diagnostic information.

Features
  • Family devices (L99LD21/20) fully configurable and pin-to-pin compatible
  • Shunt-less buck converter
  • Low external component count
  • Onboard OTP (for limp-home function, to preserve fail-safe mode operation)
  • Standby mode with low quiescent current consumption
  • Watchdog supervising SPI bus communication
  • High-frequency 32-bit SPI bus (to reduce bus load)
  • Simplified thermal layout (no external thermal sensors)
  • Powerful internal PWM unit
  • LED current analog dimming without flickering
  • Fast LED output voltage reading for better dynamic behavior
Applications
  • Exterior automotive lighting - front LED lighting:
    • Low beam
    • High beam
    • Daytime running light
    • Turn indicator
    • Position light
    • Side marker
    • Fog light

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