The RAA212831 is a triple output regulator combining a 4.5V to 72V input, 0.5A buck regulator with two LDO outputs. The buck regulator has a fixed switching frequency of 350kHz in Continuous Conduction mode (CCM) and operates in pulse-skipping mode at lighter loads when it enters Discontinuous Conduction mode (DCM). The two LDOs operate from a 12V (or lower) input voltage. The LDOs are rated at 100mA and 50mA of output current. The buck regulator output can be set from 1.25V to VIN×Dmax. The LDOs can support an input voltage range of 6V to 12V, and the output voltages are fixed at 3.3V and 5V. The IC is designed to provide a compact, highly integrated power management solution. Its integrated buck regulator and LDO outputs minimize system component count.


  • Buck Converter
    • 4.5V to 72V input voltage
    • Adjustable output voltage from 1.25V to VIN×Dmax
    • 500mA output load capability
    • 0.6Ω high-side MOSEFT rDS(ON)
    • Fixed switching frequency 350kHz in CCM operation
    • Pulse skipping mode in DCM operation
    • 6V standby function by external components
    • High-side OCP, UVP, UVLO, OTP fault protection
  • 5V LDO Regulator
    • 6V to 12V input voltage
    • Fixed output voltage 5V
    • 100mA output load capability
    • Current limit foldback function
  • 3.3V LDO Regulator
    • 4.5V to 12V input voltage
    • Fixed output voltage 3.3V
    • 50mA output load capability
    • Current limit foldback function
    • SOIC8-E package




  • Electric-bike power management
  • Motor driver control board power supply


Type Title Date
Datasheet PDF 3.26 MB
Brochure PDF 8.73 MB
Brochure PDF 5.49 MB 日本語
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