Configurable, 10A Dual-Phase SubPMIC for high performance mobile processors and memory

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10A, Dual Phase I2C Controlled SubPMIC

DA9121 is a SubPMIC suitable for supplying CPUs, GPUs, 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 0.10 μH inductor. It is capable of delivering up to 10A output current at a 0.3 V to 1.9 V output voltage range. The 2.5 V to 5.5 V input voltage range is suitable for a wide variety of low voltage systems, including, but not limited to, all Li-Ion battery supplied applications.






  • 2.5 V to 5.5 V input voltage
  • 0.3 V to 1.9 V output voltage
  • 4 MHz 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 ºC ambient temperature range
  • Package: 24WLCSP 2.5 mm x 1.7 mm (0.4 mm pitch)


  • 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 & 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


  • Smartphones
  • Tablets
  • Notebook PCs
  • RF Modules
  • Solid State Drives
  • Hard Disk Drives
  • Game Consoles
  • Handheld Devices
2.5mm x 1.7mm WL-CSP 24


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