Automotive PMIC with Three Synchronous Buck Regulators and One Low Dropout Linear Regulator

   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.

FEATUREs
▪ ASIL-D ISO26262 Development Process
▪ VIN Operating Range from 4.0 to 42V
   • Start Range 4.5 to 42V
▪ Fixed Switching frequency: 2.2MHz with optional
   pseudo-random spread spectrum
▪ Three synchronous bucks with internal
   compensation and one LDO
   • Buck1 output range: 2.8V to 5.05V, up to 1A
   • Buck2/3 output range: 0.85V to 3.3V, up to 1A
   • LDO4 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 Buck2, Buck3, and
   LDO4
▪ 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 Buck1
      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 +125°C
   (TJ = 150°C)

APPLICATIONs
▪ Driver monitoring cameras
▪ Rear and surround view HD automotive cameras
▪ Microcontroller PMIC for battery management
   systems
▪ Microcontroller PMIC for zone and domain
   controllers
▪ Microcontroller PMIC for gateway units