NXP Semiconductors
UM11216
PCA9420UK-EVM evaluation board user manual
UM11216
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User manual
Rev. 1.2 — 11 March 2020
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4 Device description
The PCA9420UK 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 current. It has I
2
C programmable Constant Current (CC)
and Constant Voltage (CV) values for flexible configuration. Various built-in protection
features such as input overvoltage protection, overcurrent protection, thermal protection,
etc. are also provided for safe battery charging. It also features JEITA compliant
charging. The device also integrates two step-down (buck) DC/DC converters which
have I
2
C programmable output voltage. Both buck regulators have integrated high-side
and low- side switches and related control circuitry, to minimize the external component
counts; a Pulse-Frequency Modulation (PFM) approach is utilized to achieve better
efficiency under light load condition. Other protection features such as overcurrent
protection, under-voltage lockout (UVLO), etc. are also provided. By default, the input for
these regulators is powered by either VIN or VBAT, whichever is greater.
In addition, two on-chip LDO regulators are provided to power up various voltage rails in
the system.
Other features such as FM+ I
2
C interface, chip enable, interrupt signal, etc. are also
provided.
The chip is offered in 2.09mm x 2.09mm, 5 x 5 bump, 0.4mm pitch WLCSP package.