The RAA271050 is an automotive grade (AEC Q-100 Grade 1, ASIL C) 4A synchronous step-down voltage regulator with integrated high-side and low-side MOSFETs. The output voltage of this buck regulator is fixed to either 5.0V/3.3V. With an input voltage range of 4.5V to 42V, it provides a high-efficiency solution for a variety of point-of-load applications. The RAA271050 works as a primary regulator and companion product with the RAA271000 system PMIC, whose target application is the R-Car V3H processor, where a high-performance complete power solution is required.


  • AEC-Q100 qualified, Grade 1: -40°C to +125°C
  • Supports ASIL C Systems
  • VIN operating range from 4.0V to 42V
  • VOUT = 5.0V or 3.3V (factory programmable)
  • High-efficiency synchronous buck regulator with efficiency up to:
    • 95%; VIN = 12V; VOUT = 5V; F = 440kHz
    • 92%; VIN = 12V; VOUT = 5V; F = 2.2MHz
  • 2% VOUT accuracy over temperature, load, line
  • Factory programmable soft-start
  • Soft-stop output discharge during disable
  • RSTb output which doubles as Monitor fault or Buck Fault Indicator
  • Fixed switching frequency: 2.2MHz or 440kHz
  • Spread Spectrum Modulation (SSM), pseudo-random frequency and dwell time
    • Enable/disable
    • Frequency modulation ±1%, ±2%, ±3%,
    • Upward/centered/downward modulation
  • Boot UVLO




  • Automotive vision systems
  • Automotive Light Detection and Ranging (LiDAR) systems
  • Automotive Advanced Driver Assistance Systems (ADAS) systems
  • Automotive Integrated Cockpit systems
  • Ideal pre-regulator for the RAA271000 PMIC


Type Title Date
Datasheet - Short-form Log in to Download PDF 325 KB
Brochure PDF 5.49 MB 日本語
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