NXP Semiconductors PCA9422 Ultra-Low-Power Charger+Gauge PMICs

The devices also integrate three step-down DC/DC converters (buck regulators) with I²C-programmable output voltages, each equipped with high-/low-side switches and control circuitry to minimize external components. A Pulse-Frequency Modulation (PFM) scheme enhances efficiency under light loads, while additional protections such as overcurrent and undervoltage lockout (UVLO) are included. By default, these regulators draw power from the higher of V_IN or V_BAT. An ultra-low quiescent buck-boost converter is provided for peripherals requiring voltages above or below battery level, seamlessly transitioning between buck, buck-boost, and boost modes to reduce ripple discontinuities.

To support multiple system rails, the NXP PCA9422 PMICs include four on-chip LDO regulators: one for SNVS core power, two 200mA NMOS LDOs with load-switch capability for low-voltage regulation from buck outputs, and one 200mA PMOS LDO for microcontrollers or peripherals. Additional features include an FM+ I²C interface, chip enable, interrupt signaling, and OTP configuration options. The devices are offered in a compact 2.90mm × 3.00mm WLCSP package with a 7×7 bump array and 0.4mm pitch.