PCA9422AUKZ - Charger+Gauge PMIC 640mA | NXP | Low-Power MCU
MPN: PCA9422AUKZ β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.95 | $1.95 |
| 10 | $1.76 | $17.60 |
| 100 | $1.52 | $152.00 |
| 500 | $1.36 | $680.00 |
| 1,000 | $1.19 | $1,190.00 |
PCA9422AUKZ Overview
A power management IC (PMIC) is a semiconductor device that consolidates multiple power functions - battery charging, voltage regulation, monitoring and protection - into a single chip. Within the power management hierarchy, a PMIC sits above individual LDOs and chargers, providing a complete power tree for the system. The PCA9422 targets low-power microcontroller applications and systems powered by small rechargeable batteries, where board space and quiescent current are at a premium.
Key features of the PCA9422AUKZ include the JEITA-compliant linear charger with programmable charge current up to 640 mA, battery temperature monitoring per the JEITA profile for safe charging across temperature ranges, and I2C programmability that lets firmware adapt charging parameters, voltage limits and protection thresholds at runtime. Various built-in protection functions guard against overvoltage, overcurrent and thermal faults, reducing the need for external protection circuitry.
Architecturally, the device integrates the charger state machine, battery gauge functionality and configuration registers behind a standard I2C serial interface, allowing the host microcontroller to monitor charge status and battery parameters while the PMIC autonomously manages the charge cycle. This offloads power management from the MCU firmware and improves overall system robustness.
Typical applications include battery-powered IoT sensor nodes, wearable devices, portable medical accessories, and low-power microcontroller systems such as NXP i.MX RT-class edge platforms with small batteries, where a complete single-chip power solution minimizes solution size.
Design consideration: because the linear charger dissipates (VIN - VBAT) x ICHG as heat, limit charge current or input voltage differential in thermally constrained enclosures, and use the JEITA temperature monitoring with an appropriate NTC to protect the cell.
This page synthesizes distributor pricing, availability and practical design guidance for the PCA9422AUKZ not found in the manufacturer datasheet alone.
Drop-in alternatives for PCA9422AUKZ β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PCA9422AUK
β Drop-Inπ Reference alternative (not in catalog)
PCA9422AUKZ Maximum Ratings & Electrical Characteristics
| Function | Charger + Gauge Power Management IC for low-power MCU applications |
| Battery Charger Type | Linear, JEITA compliant |
| Maximum Charge Current | 640 mA |
| Control Interface | I2C programmable |
| JEITA Compliance | Yes |
| Built-in Protection | Various built-in protection functions |
| Target Applications | Low-power microcontroller, small battery applications |
| Package | 49-WLCSP (3 x 2.9 mm) |
| Mounting Type | Surface Mount |
| Supplier Device Package | 49-WLCSP |
PCA9422AUKZ 49-wlcsp Pin Configuration Guide
Pin configuration for PCA9422AUKZ (49-wlcsp package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PCA9422AUKZ.
Refer to the datasheet for full pin configuration.
Typical Applications
PCA9422AUKZ is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Wearable Devices, NXP i.MX RT5/6/700 Edge Platforms, Portable Medical Accessories, Low-Power Microcontroller Systems, Smart Home Battery Devices.
Battery-Powered IoT Sensor Nodes
The PCA9422AUKZ fits battery-powered IoT sensor nodes because it combines a JEITA-compliant linear charger with up to 640 mA charge current and gauge functionality in a 3 x 2.9 mm 49-WLCSP, leaving board area for the radio and sensors. In a typical node, a small Li-based cell is charged from USB or a 5 V source while the MCU tunes charge parameters over I2C, and built-in protection functions keep the cell safe during unattended deployment. Because the linear charger dissipates (VIN - VBAT) x ICHG as heat, firmware should limit charge current in sealed enclosures; the JEITA temperature profile automatically derates charging when the cell is hot or cold. The I2C interface lets the node log battery status for predictive maintenance.
Recommended
Wearable Devices
Wearables demand the smallest possible power solution, and the PCA9422AUKZ addresses this directly with a 49-ball WLCSP measuring just 3 x 2.9 mm that integrates the charger, gauge and protection on one die. The 640 mA maximum linear charge current is appropriate for the small cells used in rings, patches and hearables, charging a typical 100-200 mAh cell in well under an hour at moderate currents. JEITA-compliant charging monitors cell temperature so the device can be worn or docked safely across ambient conditions, and I2C programmability lets wearable firmware adapt charging between docked fast-charge and battery-friendly slow-charge modes. The WLCSP ballout requires careful PCB land-pattern work per the NXP datasheet to ensure reliability under flexing.
Recommended
NXP i.MX RT5/6/700 Edge Platforms
NXP explicitly positions the PCA9422 as the power management companion for i.MX RT5/6/700-class microcontroller platforms and small-battery systems, per the NXP product family page. In this role the PCA9422AUKZ supplies the charge and power management functions while the i.MX application processor acts as the I2C host, configuring charge current, voltage limits and protection thresholds at boot and monitoring charge status at runtime. The integrated gauge information supports state-of-charge reporting in the application UI or cloud telemetry. Because the PMIC autonomously manages the charge state machine, i.MX firmware is relieved of low-level charging supervision, improving robustness; the main design consideration is mapping the PMIC power rails to the processor power tree in the schematic.
Recommended
Portable Medical Accessories
Portable medical accessories such as vital-sign patches and handheld diagnostic pods benefit from the PCA9422AUKZ's integration and safety features. The JEITA-compliant charger protects the small Li-based cell across the temperature range a body-worn device encounters, an important consideration for patient-coupled equipment, while various built-in protection functions add defense in depth against fault conditions. The 3 x 2.9 mm 49-WLCSP supports the compact, lightweight form factors these accessories require, and the 640 mA maximum charge current allows fast turnaround between uses on a charging dock. I2C programmability lets firmware log charge cycles and battery health, useful for medical device service records; verify cell and charger behavior against the applicable medical electrical safety standards in the final system design.
Recommended
Low-Power Microcontroller Systems
General low-power microcontroller systems - from home automation controllers to industrial wireless monitors - can replace a discrete charger plus separate gauge ICs with the single-chip PCA9422AUKZ. Its I2C-programmable configuration means one PCB supports multiple battery sizes: firmware simply programs different charge current and voltage limits per SKU, reducing board variants. The JEITA profile protects the cell regardless of installation environment, and the built-in protections reduce component count compared with discrete protection FET and fuse solutions. Designers should budget thermal margin for the linear charger at high input voltages and size the PCB copper around the WLCSP accordingly, then validate charge termination behavior with the target cell per the NXP datasheet test recommendations.
Recommended
Smart Home Battery Devices
Smart home battery devices - door locks, sensors, remotes and tracker tags - operate for months on small cells, making the PCA9422AUKZ's ultra-low-power charger-plus-gauge architecture a strong fit. The gauge data exposed over I2C allows the device to report remaining battery life to the user's app accurately rather than relying on crude voltage thresholds, while the JEITA-compliant charging protects cells charged on windowsills or in unheated garages. The 3 x 2.9 mm WLCSP fits inside slim industrial designs, and built-in protection functions guard the cell through years of unattended charge cycles. Firmware should use conservative charge currents for tiny cells; the 640 mA ceiling provides headroom for larger batteries in the same product family platform.
Recommended
Recommended Products Summary
Engineering reference data for PCA9422AUKZ β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PCA9422AUK |
|---|---|---|
| Package | 49-WLCSP (3 x 2.9 mm) | 49-WLCSP (3 x 2.9 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors |
| Maximum Charge Current | 640 mA | 640 mA |
| Charger Type | Linear, JEITA compliant | Linear, JEITA compliant |
| Control Interface | I2C | I2C |
| Integrated Gauge | Yes (charger + gauge PMIC) | Yes |
| Target Platform | Low-power MCU, i.MX RT5/6/700, small battery | Same |
Key Differentiators
- Charger and gauge integrated on one die (vs Discrete stand-alone linear charger ICs)
- I2C-programmable configuration instead of fixed pin straps (vs Configuration-pin chargers)
- Family flexibility within NXP (vs PCA9422AUK orderable variant)
Design Notes
Estimated: because the PCA9422 uses a linear charger, on-chip power dissipation is approximately (VIN - VBAT) x ICHG. For example, charging at 640 mA from a 5 V source into a 3.7 V cell dissipates roughly 0.83 W. In the 49-WLCSP (3 x 2.9 mm) package, this heat must spread through the PCB copper - provide solid connects to the ballout power balls and adequate copper area per the NXP datasheet layout guidelines. Reduce I2C-programmed charge current in sealed or high-ambient enclosures, and rely on JEITA temperature monitoring with a correctly placed NTC to derate charging safely.
The 49-WLCSP (3 x 2.9 mm) package uses a fine-pitch ball grid that demands tight land-pattern control. Follow the NXP datasheet land pattern and routing rules exactly: matched via-in-pad or dog-bone fanout, short thick traces on the charge current path (VBUS, BAT) to limit IR drop at 640 mA, and place input/output decoupling capacitors close to their balls. WLCSP solder joints are sensitive to board flex, so avoid placing the device near board edges or mounting bosses, and follow IPC-style symmetric copper balance on the two board faces.
Configure charging parameters over I2C before first field use - default register values may not match your specific cell's current and voltage limits. Verify the battery temperature sensing element (NTC) type and divider values against the JEITA thresholds in the datasheet; a wrong NTC beta value can cause false hot/cold charge suspension. Do not exceed the 640 mA rating, and confirm input source current capability so the charger does not collapse the VBUS supply during bulk charging.
Compliance Information
Compliance status not stated in the verified web data for this orderable code; consult the NXP product page for PCA9422AUK for current RoHS/REACH documentation.
