PMIC for Low Power Applications


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Block Diagram


PCA942X Block Diagram


General Features

  • Optimized for low-power applications
  • Typical 100 nA quiescent current in ship mode
  • Small total solution size
  • Built-in “Mode” configuration to accommodate fast mode switch supporting different MCU operation modes
  • i.MX RT MCU supported
  • Load supply voltage 2 V (Min), 6.8 V (Max)
  • I2C interface and input control
  • Output current 0.5 A

Battery Charger (Only for PCA9420)

  • Linear battery charger for charging single-cell Li-ion battery
  • 20 V tolerance on VIN pin
  • Programmable constant current (up to 315 mA) and precharge low voltage current threshold
  • Programmable constant voltage regulation
  • Built-in protection features such as input OVP, battery SCP, thermal protection
  • JEITA compliant
  • Battery attached detection


  • Over-temperature protection
  • -40 °C ~ +85 °C ambient temperature range

DC-DC (Buck) Converters

  • Programmable output voltage
  • SW1: core buck converter, 0.5 V ~ 1.5 V output, 25 mV/step and a fixed 1.8 V, up to 250 mA
  • SW2: system buck converter, 1.5 V ~ 2.1 V/2.7 V ~ 3.3 V output, 25 mV/step, up to 500 mA
  • Low-power mode for extra power saving


  • Programmable output voltage regulation
  • LDO1: always-on LDO, 1.70 V ~ 1.90 V output, 25 mV/step, up to 1 mA
  • LDO2: system LDO, 1.5 V ~ 2.1 V/2.7 V ~ 3.3 V output, 25 mV/step, up to 250 mA


  • 1 MHz I2C-bus target interface


  • 2.09 mm x 2.09 mm, 5 x 5 bump, 0.4 mm pitch WLCSP
  • 3 mm x 3 mm, 24-pin QFN

Product Longevity Program

  • This product is included in the NXP Product Longevity program ensuring a stable supply of products for your embedded designs. The PCA9421 is included in the 15-year program

Part numbers include: PCA9420UK, PCA9421UK, PCA9421BS.


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Note: For better experience, software downloads are recommended on desktop.

Engineering Services

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To find a complete list of our partners that support this product, please see our Partner Marketplace.


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