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Automotive Constant Current Regulated LED Driver from TSC

Low-Side Constant Current Regulator (CCR) for linear LED driving: TSCR420 & TSCR421

The AEC-Q100 qualified LED Driver regulates with a present 10mA nominal, that can be adjusted with an external resistor up to 300mA. It is designed for driving LEDs in strings and will reduce current at increasing temperatures to self-protect.

Operating as a series linear CCR for LED string current control, it can be used in multiple applications up to a maximum supply voltage of < 40V. With the low-side control, the TSCR421 has an Enable (EN) pin, which can be pulse-width modulated (PWM) up to 10kHz by a microcontroller for LED dimming.

The output current at higher temperatures is the result of the negative temperature coefficient of 0.07%/°C of the LED driver.

Key Features & Advantages:

  • Low-side control Linear Constant Current Regulator
  • LED drive current present 10mA
  • Very low enable current
  • Adjustable output current with external resistor up to 300mA
  • Supply voltage up to 40V
  • Easy paralleling of drivers to increase current
  • Good temperature coefficient vs. output current
  • Digital PWM input up to 10kHz (TSCR421CX6)
  • PPAP capable
  • AEC-Q100 qualified:
    • Device temperature grade 1: -40°C to 125°C
    • Device HBM ESD classification level H2
    • Device CDM ESD classification level C6


  • Ambient light
  • Interior light
  • Turn signals
  • Rear cluster lighting
  • Puddle & Sill lights
  • Reading light
  • Instrument cluster illumination
LED Driver Automotive