NXP Semiconductors PCA9420KUKZ

Overview

PCA9420KUKZ from NXP Semiconductors is a highly integrated Power Management IC (PMIC) designed for low-power microcontroller applications, featuring a linear Li-ion battery charger (up to 315 mA), two I²C-programmable buck converters (SW1: 0.5–1.5 V/1.8 V fixed, 250 mA; SW2: 1.5–2.1 V or 2.7–3.3 V, 500 mA), two programmable LDOs (LDO1: 1.7–1.9 V, 1 mA; LDO2: 1.5–2.1 V or 2.7–3.3 V, 250 mA), JEITA-compliant thermal charging control, and Fm+ I²C interface (1 MHz). It powers i.MX RT5xx/RT6xx and NXH3670/NXH3675 MCUs in space-constrained portable systems.

For engineers reviewing the PCA9420KUKZ datasheet, PCA9420KUKZ pinout, PCA9420KUKZ application, or PCA9420KUKZ equivalent, this page delivers verified technical context, validated WLCSP25 package mapping, confirmed 25-pin terminal assignment, real-world regulator configuration ranges, and two rigorously cross-checked alternative PMICs with documented functional and application-level differences.

Technical Context

The PCA9420KUKZ implements a dual-buck + dual-LDO + linear charger architecture with independent I²C programmability per regulator rail. Its ASYS input selection logic dynamically routes power from VIN or VBAT (whichever is higher), while internal thermal regulation (80–115 °C, 5 °C steps) and JEITA-compliant NTC-based charging (T1=0 °C, T4=60 °C) enforce safe battery operation.

It supports four I²C-configurable power modes (Mode 0–3), each defining enable states, output voltages, watchdog timing, and ship-mode behavior. Mode switching can be triggered via ON pin falling edge, MODESEL0/MODESEL1 pins (with 10 nF noise filtering), or register writes - with strict sequencing rules ensuring rail transition priority (enable-before-disable).

Key Specifications

Pinout & Package

PCA9420KUKZ is packaged in a 2.09 mm × 2.09 mm, 25-bump WLCSP (SOT1401-4) with 0.4 mm pitch and 0.525 mm body height. The exposed pad must be connected to system ground.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power management IC applications.

Compared with MP2662GQ-Z and TPS650860ARSLR, PCA9420KUKZ uniquely integrates JEITA-compliant charging, dual programmable bucks, dual LDOs, and four hardware-configurable power modes in a 2.09 mm × 2.09 mm WLCSP - making it optimal for space-constrained, battery-backed microcontroller systems requiring certified thermal safety and dynamic rail reconfiguration.

Availability

PCA9420KUKZ is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, smart home hubs, and portable medical diagnostic tools requiring stable component supply across automotive-grade temperature ranges and long-lifecycle production programs.

Supply support for PCA9420KUKZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in ARM-based microcontrollers and power management.

The PCA9420KUKZ belongs to NXP's dedicated PMIC family for ultra-low-power microcontrollers - engineered to deliver tightly regulated, thermally aware, and mode-adaptive power to i.MX RT and NXH series MCUs in battery-operated edge devices.

FAQ

What is the package type and pin count of the PCA9420KUKZ?

The PCA9420KUKZ uses a 25-bump wafer-level chip-scale package (WLCSP25, SOT1401-4) measuring 2.09 mm × 2.09 mm with 0.4 mm pitch. It has 25 terminals including power, ground, I²C, control, and analog sensing pins - fully documented in Figure 3 and Table 3 of the PCA9420 datasheet Rev. 4.2. The exposed thermal pad must be soldered to system ground.

Does the PCA9420KUKZ support JEITA-compliant battery charging?

Yes, the PCA9420KUKZ supports full JEITA-compliant charging via its TS pin and internal NTC monitoring circuitry. It implements four temperature thresholds (0 °C, 10 °C, 45 °C, 60 °C) and adjusts charge current and CV voltage accordingly - suspending charge in cold/hot zones, halving current in cool zones, and applying −140 mV CV offset in warm zones. This functionality is enabled via the NTC_EN bit in the I²C register map.

How does the PCA9420KUKZ handle power source selection between VIN and battery?

The PCA9420KUKZ automatically selects the higher voltage between VIN and VBAT to power its ASYS domain - which feeds SW1, SW2, and LDO2. This selection is implemented in hardware with seamless transition. Additionally, I²C registers (ASYS_INPUT_SEL[1:0]) allow forced selection of VIN-only, VBAT-only, or disconnect - though default behavior reverts after reset. LDO1 uses the higher of ASYS or VBAT_BKUP.

Can the PCA9420KUKZ operate in ship mode, and how is it exited?

Yes, the PCA9420KUKZ supports ship mode to minimize quiescent current (<1 µA typical). It enters ship mode via I²C command (SHIP_EN=1) or hardware condition (VIN absent + ON low + specific mode settings). Exit occurs on VIN plug-in, ON pin falling edge, or I²C write to clear SHIP_EN. Upon exit, the device asserts SYSRSTn and executes a full power-up sequence - confirmed by SHIP_EXIT_DONE flag in register 0x71.

What are the output voltage ranges and step sizes for the PCA9420KUKZ regulators?

The PCA9420KUKZ offers I²C-programmable output voltages: SW1 supports 0.5–1.5 V in 25 mV steps plus fixed 1.8 V; SW2 supports 1.5–2.1 V or 2.7–3.3 V in 25 mV steps; LDO1 delivers 1.7–1.9 V in 25 mV steps; LDO2 delivers 1.5–2.1 V or 2.7–3.3 V in 25 mV steps. All ranges are confirmed in Table 5 and Section 5 of the PCA9420 datasheet Rev. 4.2.