Automotive Dual Buck Regulator and Controller with Voltage Monitors and Watchdog Timer

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Block Diagram

FS56 Block Diagram

FS56 Block Diagram


Power Management

  • 2 x High-Voltage Buck Converters:
  • HV Buck Controller - External FETs – up to 15A load
  • 3 A HV Buck Regulator – Internal FETs - η = 93% @ 3A
  • +/- 2% Output Accuracy
  • 250 kHz to 3 MHz switching frequency
  • High-Efficiency PFM Mode (700 uW quiescent power)

System Features

  • Dual independents DC/DC Buck
  • GPIOs for seamless operation with PF PMICs
  • Rated from -40 °C to 150 °C TJ

Safety Features (ASIL B)

  • ASIL B compliant
  • 2 internal and 4 external voltage monitors
  • Windowed Watchdog Timer
  • PGOOD and FS0B outputs
  • SoC HW monitoring pins (FCCU and ERRMON)


  • Supplies, sequencing and specific functions can be programmed by One Time programmable (OTP) memory
  • Standard Predefined OTP supporting popular MCU can be found in data sheet under “ordering information” chapter
  • Custom OTP can be provided for production. Please contact your NXP sales channel (NXP or your distributor)
  • Custom OTP can be created using the NXP GUI software tool

Product Longevity Program

  • This product is included in the NXP Product Longevity program ensuring a stable supply of products for your embedded designs. Automotive target market derivatives are included in the 15-year program and Industrial target market derivatives are included in the 10-year program

Comparison Table

Device options for Automotive

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BYLink System Power Platform

This platform facilitates the design of safe power management systems thanks to a portfolio of configurable and linkable devices. It simplifies complex power supply subsystems into a single smart solution.
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