PCA9420 Power management IC for low-power microcontroller applications Rev. 3.0 8 December 2021 Product data sheet 1 General description The 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 current. 2 It has an I 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. 2 The device also integrates two step-down (buck) DC/DC converters which have I 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. 2 Other features such as FM+ I C-bus interface, chip enable, interrupt signal, etc. are also provided. The chip is offered in 2.09 mm x 2.09 mm, 5 x 5 bump, 0.4 mm pitch WLCSP package and 3 mm x 3 mm, 24-pin QFN package. 2 Features and benefits 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 (up to 315 mA) and pre-charge low voltage current threshold Programmable constant voltage regulation Programmable automatic recharge voltage and termination current threshold Built-in protection features such as input OVP, battery SCP, thermal protection JEITA compliant Battery attached detection Over-temperature protectionNXP Semiconductors PCA9420 Power management IC for low-power microcontroller applications 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 saving Two LDOs Programmable output voltage regulation LDO1: always-on LDO, 1.70 V to 1.90 V 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 output, 25 mV/step, up to 250 mA 2 1 MHz I C-bus slave interface -40 C to +85 C ambient temperature range Offered in 5 x 5 bump-array WLCSP and 24-pin QFN package 3 Applications Low power microcontroller application 4 Ordering information Table 1.Ordering information Type number Topside Package marking Name Description Version PCA9420BS 420 HVQFN24 plastic thermal enhanced very thin quad flat package no SOT905-1 leads 24 terminals body 3 x 3 x 0.85 mm PCA9420UK 9420 WLCSP25 wafer level chip-scale package, 25 terminals, 0.4 mm SOT1401-4 pitch, 2.09 mm x 2.09 mm x 0.525 mm body 4.1 Ordering options Table 2.Ordering options Type number Orderable part Package Packing method Minimum order Temperature range number quantity PCA9420BS PCA9420BSZ HVQFN24 REEL 7 Q2 NDP 1400 -40 C to +85 C PCA9420UK PCA9420UKZ WLCSP25 REEL 7 Q1 DP CHIPS 3000 -40 C to +85 C PCA9420 All information provided in this document is subject to legal disclaimers. NXP B.V. 2021. All rights reserved. Product data sheet Rev. 3.0 8 December 2021 2 / 85