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




Type Title Date
Datasheet PDF 2.38 MB 日本語
Product Change Notice PDF 326 KB
Price Increase Notice PDF 257 KB
Application Note PDF 509 KB
Application Note PDF 397 KB
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