The RAA212422 is a dual output regulator combining a 1.1A synchronous buck regulator with an input range of 3V to 40V with a 1.5A synchronous buck regulator with an input voltage range of 2.7V to 5.5V. Because both high-side and low-side MOSFETs are integrated for both regulators, the RAA212422 provides an easy-to-use, high-efficiency, and low BOM-count solution for a variety of applications. Both regulators feature internal and external compensation, thermal shutdown, and power-good functions. The wide VIN buck regulator features a PFM mode for improved efficiency at light load. This feature can be disabled if forced PWM mode is desired. It switches at a default frequency of 500kHz; however, it can also be programmed using an external resistor from 300kHz to 2MHz. Other features include programmable soft-start and hiccup overcurrent protection. The low VIN buck regulator operates at 1MHz switching frequency, which provides fast load transient response allowing the use of small inductors. Because the high-side MOSFET of the low VIN buck regulator is a PMOS, a boot capacitor is not needed, reducing the external component count. They operate at 100% duty cycle and in PWM mode only, reducing noise susceptibility and RF interference. The RAA212422 is available in a small RoHS compliant 3mmx6mm TDFN plastic package with a full-range industrial temperature of -40°C to +125°C.


  • Wide VIN buck regulator
    • Input voltage: 3V to 40V with 1.1A output current
    • Internal fixed frequency (500kHz) or adjustable switching frequencies (300kHz to 2MHz)
    • Selectable PFM or PWM mode at light loads
    • Internal or external soft-start
  • Low VIN buck regulator
    • Input voltage: 2.7V to 5.5V, with 1.5A output current
    • VOUT range: 0.6V to VIN
    • Fixed 1MHz switching frequency
  • Synchronous operation for high efficiency
  • Integrated high-side and low-side MOS devices
  • Internal or external compensation option
  • Power-good and enable functions
  • Thermal shutdown



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