The DA9121 is a sub-PMIC suitable for supplying CPUs, GPUs and DDR memory rails in smartphones, tablets, RF modules, and other handheld applications.

DA9121 operates as a single-channel dual-phase buck converter, each phase requiring a small external 0.10μH inductor. It is capable of delivering up to 10A of output current at a 0.3V to 1.9V output voltage range. The 2.5V to 5.5V input voltage range is suitable for a wide variety of low voltage systems, including, but not limited to, all Li-ion battery-supplied applications.


  • Input voltage range provides flexibility to run from single-cell Li-ion battery or standard 3.3V or 5V system rail  
  • Differential voltage sensing provides tight regulation accuracy requirements of CPU cores in mobile SoCs
  • 4MHz switching frequency reduces footprint and height of output inductor and minimizes output capacitance, lowering BOM cost
  • Triggered through either an I2C or GPIO interface, output dynamic voltage control can be used to optimize system power consumption


  • 2.5V to 5.5V input voltage
  • 0.3V to 1.9V output voltage
  • 4MHz nominal switching frequency
  • ±1% accuracy (static)
  • ±5% accuracy (dynamic)
  • I2C-compatible interface (FM+)
  • Configurable GPIOs
  • Programmable soft-start
  • Voltage, current, and temperature supervision
  • -40 °C to +85 °C ambient temperature range
  • Package: 24-WLCSP (2.5mm x 1.7mm, 0.4mm pitch)



  • Smartphones
  • Tablets
  • Notebook PCs
  • RF modules
  • Solid-state drives
  • Hard disk drives
  • Game consoles
  • Handheld devices


Document title Document type Type Date Date
PDF 1.36 MB Datasheet
PDF 460 KB Application Note
PDF 1.21 MB Manual - Development Tools
PDF 782 KB Product Brief
4 items

Design & Development

Software & Tools

Software Downloads

Software title Software type Type Date Date
ZIP 438 KB Software & Tools - Other
ZIP 85.25 MB Software & Tools - Software
2 items