PCA9420 Power Management IC for Low-Power Applications

NXP's power management IC features a linear battery charger, two LDOs, and two step-down DC/DC converters

Image of NXP's PCA9420 Power Management IC NXP's PCA9420 is a highly-integrated power management IC (PMIC) targeted to provide a full-power management solution for low-power microcontroller applications or other similar applications. The device consists of a linear battery charger capable of charging up to 315 mA of current. It has I²C programmable constant current (CC) and constant voltage (CV) values for flexible configuration. Various built-in protection features such as input overvoltage protection, overcurrent protection, and thermal protection are provided for safe battery charging, and it also features JEITA-compliant charging.

The device also integrates two step-down (buck) DC/DC converters which have I²C programmable output voltage. Both buck regulators have integrated high-side and low-side switches and related control circuitry to minimize the external component counts. In addition, a pulse-frequency modulation (PFM) approach is utilized to achieve better efficiency under light load condition. By default, the input for these regulators is powered by either VIN or VBAT, whichever is greater.

PCA9420 Block Diagram


  • Linear battery charger for charging single cell Li-Ion battery
    • 20 V tolerance on VIN pin
    • Programmable input OVP (5.5 V or 6 V)
    • Programmable constant current (CC) up to 315 mA and constant voltage (CV) regulation
    • Programmable automatic recharge voltage and termination current threshold
    • Built-in protection features such as input OVP, battery SCP, and thermal protection
    • JEITA-compliant; battery attached detection; over-temperature protection
  • Two LDOs
    • LDO1: always-on LDO, 1.70 V to 1.90 V programmable output, 25 mV/step up to 1 mA
    • LDO2: system LDO, 1.5 V to 2.1 V / 2.7 V to 3.3 V programmable output, 25 mV/step up to 250 mA
    • 1 MHz I²C-bus slave interface
    • Ambient temperature range: -40°C to +85°C
    • Offered in 5 x 5 bump-array WLCSP and 24-pin QFN package
  • Two step-down DC/DC converters
    • Very-low quiescent current
    • Programmable output voltage
    • SW1: core buck converter, 0.5 V to 1.5 V output, 25 mV/step, and a fixed 1.8 V up to 250 mA
    • SW2: system buck converter, 1.5 V to 2.1 V / 2.7 V to 3.3 V output, 25 mV/step up to 500 mA
    • Low-power mode for extra power savings
  • Fitness trackers/watches
  • Computer accessories
  • Hearables
  • Other low-power Li-ion battery-powered devices

PCA9420 Power Management IC for Low-Power Applications

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Published: 2019-12-02