PCA9422BUKZ - PMIC with 640mA Charger | NXP Semiconductors
MPN: PCA9422BUKZ β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
PCA9422BUKZ Overview
A power management IC (PMIC) is a semiconductor device that integrates multiple power functions - voltage regulation, battery charging, load switching, and monitoring - into a single die. Within the power management hierarchy, a PMIC sits above discrete LDO regulators and charger ICs, providing a complete power tree for a system on one chip. For battery-powered microcontroller systems, an integrated PMIC reduces board area, bill-of-materials count, and design complexity compared to a multi-chip solution.
The key differentiating feature of the PCA9422 is its full-solution integration: the JEITA-compliant linear charger automatically adjusts charge voltage based on battery temperature, protecting lithium cells during charging at up to 640 mA. I2C programmability allows firmware to reconfigure charge current, output voltages, and protection thresholds at runtime, enabling one hardware design to serve multiple battery and rail configurations. Built-in protection features safeguard against fault conditions without external supervision circuitry.
Architecturally, the PCA9422 targets NXP's i.MX RT5/6/700 crossover MCU families and similar low-power processors, delivering the multiple regulated rails such devices require from a single small-battery input. Integration of the charger and the rail generation in one 49-WLCSP die minimizes the footprint of the entire power section - the 3 x 2.9 mm package suits wearables, smart sensors, and compact IoT endpoints where board area is the primary constraint.
Typical applications include i.MX RT5/6/700-based embedded systems, wearable devices, small-battery IoT sensor nodes, and portable medical or industrial accessories requiring managed single-cell charging plus multiple low-voltage rails.
When designing with the PCA9422, the linear charger topology means thermal dissipation scales with the VIN-to-VCORE differential times charge current; at the full 640 mA rate with a 5V USB input, layout copper around the WLCSP balls should be maximized and JEITA temperature limits observed.
This page synthesizes verified manufacturer and distributor data, practical design notes, and application guidance not found in the datasheet alone. Pricing for this part was not published in the retrieved distributor data as of 2026-09-13 and is marked accordingly.
Drop-in alternatives for PCA9422BUKZ β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PCA9422BUKZ (same form factor and footprint) β differing in Maximum Charge Current, Mounting Type, Product Type.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PCA9422BUK
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PCA9422BUZ
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PCA9422UKZ
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PCA9422BUKZ Specifications
| Product Type | Power Management IC (PMIC) |
| Target Application | Low-power microcontroller applications, small batteries |
| Battery Charger Type | Linear, JEITA compliant |
| Maximum Charge Current | 640 mA |
| Control Interface | I2C programmable |
| Protection Features | Various built-in protection functions |
| Package | 49-WLCSP (3 x 2.9 mm) |
| Mounting Type | Surface Mount |
| Related Processor Families | i.MX RT5/6/700 |
PCA9422BUKZ 49-wlcsp (3 x 2.9 mm) Pin Configuration Guide
Pin configuration for PCA9422BUKZ (49-wlcsp (3 x 2.9 mm) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for PCA9422BUKZ.
Refer to the datasheet for full pin configuration.
Typical Applications
PCA9422BUKZ is suitable for 6 applications: i.MX RT5/6/700 MCU Power Supply, Wearable Devices, Battery-Powered IoT Sensor Nodes, Portable Medical Accessories, Smart Home and Security Sensors, Industrial Handheld Terminals.
i.MX RT5/6/700 MCU Power Supply
The PCA9422 was designed by NXP as the companion PMIC for the i.MX RT5, RT6 and RT700 crossover microcontroller families. Its JEITA-compliant 640 mA linear charger manages the single-cell lithium battery, while its I2C-programmable regulated rails supply the MCU core, memory and peripheral domains from one 3 x 2.9 mm 49-WLCSP die. Because rail voltages and sequencing are configured over I2C, a single PCA9422 layout supports multiple i.MX RT operating modes and battery options. Place the WLCSP adjacent to the MCU power pins with solid ground plane under the ball array; the linear charger's heat during fast charge must be spread into the PCB copper, and firmware should monitor JEITA temperature inputs to protect the cell.
Recommended
Wearable Devices
Wearables demand the smallest possible power section, and the PCA9422BUKZ addresses this directly: the entire charger plus rail solution occupies a 3 x 2.9 mm 49-WLCSP footprint with connections only under the die. The JEITA-compliant charger protects the small lithium-polymer cell across temperature extremes encountered on-body and outdoors, automatically adjusting charge voltage when the pack is hot or cold. The 640 mA maximum charge rate is firmware-adjustable over I2C so small cells can be charged gently, extending cycle life. Estimated: for a 200 mAh cell, charging at 320 mA gives a practical 1.6C fast-charge rate with modest thermal load in the WLCSP.
Recommended
Battery-Powered IoT Sensor Nodes
Small-battery IoT endpoints benefit from the PCA9422's single-chip integration of charging, rail generation, and protection functions, replacing three or more discrete ICs and their passives. The I2C interface allows the node's microcontroller to gate and configure rails for aggressive sleep-state power reduction, while built-in protection functions guard the cell against fault conditions without external supervision circuitry. The 49-WLCSP 3 x 2.9 mm package keeps the power tree within a fingertip-sized PCB area, matching coin-cell pouch and small cylindrical lithium form factors common in smart sensors.
Recommended
Portable Medical Accessories
Battery-operated medical accessories - portable monitors, patch-style sensors, and handheld diagnostic pods - require predictable, protected charging of small lithium cells. The PCA9422's JEITA-compliant charger automatically derates charge voltage with temperature, a safety behavior valued in skin-contact devices, and its built-in protection functions add a layer of fault management independent of firmware. The compact 49-WLCSP (3 x 2.9 mm) package suits conformal and patch form factors where board real estate is severely constrained, and I2C programmability lets one validated hardware platform be reused across multiple accessory SKUs with different batteries.
Recommended
Smart Home and Security Sensors
Battery or battery-backup smart home devices - door/window sensors, smart locks, and camera accessories - use the PCA9422 to manage a rechargeable lithium cell while producing the low-voltage rails for RF and sensing circuitry. The 640 mA maximum charge rate supports quick USB-C top-ups, while I2C control allows the host MCU to drop rail loads during sleep for months-long battery life. Its built-in protections and JEITA charging behavior maintain safe operation in enclosed wall-mounted enclosures that can warm in sunlight, and the tiny 49-WLCSP footprint fits slim sensor housings.
Recommended
Industrial Handheld Terminals
Compact industrial handhelds - scanners, tag readers, and configuration tools - pair small rechargeable lithium packs with mixed-signal MCUs, exactly the workload the PCA9422 was built for. The JEITA-compliant 640 mA linear charger recharges packs from USB sources while protecting cells in cold warehouses and hot vehicles, and the I2C-programmable rails supply MCU, radio, and display domains from one die. Industrial designers should budget for charger dissipation: estimated, at 5V input charging a deeply discharged 3.0V cell at 640 mA, dissipation reaches roughly 1.3 W, so PCB copper spreading and charge-rate firmware limits are essential in sealed enclosures.
Recommended
Recommended Products Summary
Engineering reference data for PCA9422BUKZ β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PCA9422BUK | PCA9422BUZ | PCA9422UKZ |
|---|---|---|---|---|
| Package | 49-WLCSP (3 x 2.9 mm) | 49-WLCSP (3 x 2.9 mm) - same | 49-WLCSP (3 x 2.9 mm) - same | 49-WLCSP (3 x 2.9 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Charger Type | Linear, JEITA compliant | Linear, JEITA compliant | Linear, JEITA compliant | Linear, JEITA compliant |
| Max Charge Current | 640 mA | 640 mA | 640 mA | 640 mA |
| Control Interface | I2C | I2C | I2C | I2C |
| Target Application | Low-power MCU / small battery | Low-power MCU / small battery | Low-power MCU / small battery | Low-power MCU / small battery |
| Protection Features | Built-in (per NXP) | Built-in (per NXP) | Built-in (per NXP) | Built-in (per NXP) |
Key Differentiators
- Single-chip power solution for i.MX RT5/6/700 (vs PCA9422BUK (discrete charger + LDO multi-chip approach))
- JEITA-compliant charging up to 640 mA (vs Fixed-threshold non-JEITA chargers)
- I2C-programmable configuration (vs Resistor-programmed charger ICs)
Design Notes
The PCA9422 charges the battery with a linear topology, so dissipation equals (VIN - VBATT) x ICHARGE. Estimated: at 5V USB input, a 3.7V cell and the full 640 mA rate, the die dissipates roughly 0.83 W; charging a deeply discharged 3.0V cell pushes this toward 1.3 W. In a 3 x 2.9 mm WLCSP this heat flows into the PCB, so maximize copper area and via-in-pad under the ball array, and consider firmware-limiting charge current for small packs or high VIN conditions. Observe the JEITA temperature thresholds so the charger derates the cell as designed.
The 49-WLCSP ball map has connections only under the die; route with via-in-pad or microvias and keep the ground plane unbroken directly beneath the package. Place the charger input and battery capacitors close to their respective balls to minimize loop inductance, and follow the NXP reference design layout in the PCA9422 product data sheet (Rev. 2.0, 23 March 2026) for the i.MX RT5/6/700 application circuit, since WLCSP routing is the most common source of first-pass bring-up failures.
Do not hard-code the default charge current without checking it against the battery's rated charge rate - the I2C-programmable settings allow up to 640 mA, which exceeds the safe rate of many small cells used in wearables. Initialize the I2C configuration before enabling fast charge, and confirm the ordering-code variant (temperature grade, packing) on your purchase order matches your production environment, since NXP suffixes distinguish packing and grade options within the PCA9422 family.
Compliance Information
Compliance status was not stated in the retrieved web data; the NXP Z ordering suffix is commonly associated with lead-free packing but this must be confirmed on the NXP product page or ordering information before assuming RoHS status.
