The RAA271082 is a versatile multi-rail power IC comprised of a primary high voltage synchronous buck regulator, two secondary low voltage synchronous buck regulators, and an LDO regulator. It offers four overvoltage and undervoltage monitors, I2C communications, a general-purpose I/O pin, and a dedicated reset output/fault indicator. RAA271082 was designed using an ASIL-D ISO 26262 development process and is intended to meet ASIL-B device metrics. The RAA271082 includes a second bandgap reference for the OV/UV monitors, built-in self-test at power-up, independent OV/UV monitoring, and continuous CRC error checking on internal registers and I2C communications.

Requiring few external components and minimal board space, the RAA271082 provides a high-density power solution. It offers an extensive feature set configured using internal One-Time Programmable (OTP) memory. Nearly all device options such as each output voltage selection, power sequencing, and OV/UV thresholds are internally configured and require no external components for selection. The regulators also offer internal compensation. The bucks are synchronous to achieve high efficiency and are capable of operating in harsh environments requiring high ambient temperature.

The RAA271082 is available in a 4mm x 4mm 24-lead Step Cut QFN (SCQFN) package with an exposed pad for improved thermal performance. It is AEC-Q100 qualified to Grade 1 and operates across an ambient temperature range of -40 °C to 125 °C and is electrically specified across a junction temperature range of -40 °C to 150 °C.


  • ASIL-D ISO 26262 development process
  • VIN operating range from 4.0V to 42V
    • Start range 4.5V to 42V
  • Fixed switching frequency: 2.2MHz with optional pseudo-random spread spectrum
  • Three synchronous bucks with internal compensation and one LDO
    • Buck 1 output range: 2.8V to 5.05V, up to 1A
    • Buck 2/3 output range: 0.85V to 3.3V, up to 1A
    • LDO 4 output range: 2.7V to 3.4V, up to 300mA
  • OTP UV/OV thresholds: ±4%, ±6%, ±8%, ±12%
  • OTP power up/down sequence and delay
  • Optional output discharge on Buck 2, Buck 3, and LDO 4
  • Configurable GPIO pin
  • Dual EN pins
  • Protection features
    • Input voltage UVLO
    • Output OV/UV
    • Overcurrent protection on internal and output LDOs
    • Over-temperature shutdown
  • Functional safety features
    • Built-in Self Test (BIST) at power up
    • Dual bandgap/Reference chains
    • Independent UV/OV sense path for Buck 1 output
    • Configurable Window Watchdog Timer (WWDT)
    • Continuous CRC checking of OTP shadow registers
    • CRC-protected I2C communication
    • Configurable fault manager
  • AEC-Q100 qualified, Grade 1: -40 °C to +12 5°C (TJ = 150 °C)




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