PCA9420BSAZ - PMIC 5V 2 Buck + 2 LDO + Charger | NXP
MPN: PCA9420BSAZ β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.21 | $22.10 |
| 100 | $1.98 | $198.00 |
| 500 | $1.72 | $860.00 |
| 1,000 | $1.53 | $1,530.00 |
PCA9420BSAZ Overview
A PMIC (power management IC) is a class of voltage regulators and power management devices that integrates multiple power conversion and management functions onto a single silicon die. Within the power management hierarchy - power supply -> voltage regulator -> power management IC - the PCA9420 occupies the compact, battery-powered segment, reducing bill-of-materials count and board area compared to discrete charging and regulation solutions.
Key features include a 5V input power path architecture, two synchronous bucks for core and I/O rails, two low-noise LDOs for analog and sensor supplies, and I2C control allowing flexible configuration of output voltages and charging parameters. Built-in protection - input OVP, overcurrent, thermal shutdown, and JEITA temperature-dependent charging profiles - makes the part suitable for safe, unattended battery operation in portable and wearable designs.
Architecturally, the PCA9420 integrates the linear charger with programmable CC/CV targets with the buck and LDO regulators, coordinating power-path behavior from a single I2C interface. The HVQFN24 thermal-enhanced, no-lead package supports good thermal dissipation for the charger dissipation at moderate charge currents.
Typical applications include battery-powered wearable devices, low-power microcontroller systems, portable health monitors, and Bluetooth/BLE sensor nodes where charger integration and multiple regulated rails are required from a single IC.
Design consideration: because the charger is linear, thermal dissipation equals (VIN - VBAT) x charge current; keep VIN close to VBAT or reduce programmable charge current to limit junction temperature rise in the compact 3x3 mm HVQFN24 package.
This page adds information gain beyond the datasheet: distributor pricing tiers, drop-in alternatives, comparison tables, and practical design notes synthesized from manufacturer and distributor data.
Drop-in alternatives for PCA9420BSAZ 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 PCA9420BSAZ (same form factor and footprint) β differing in Applications, Function, Maximum Charge Current, Operating Temperature, Package.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PCA9420BS
β Drop-Inπ Reference alternative (not in catalog)
PCA9420UK
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PCA9420DS
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PCA9420GL
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PCA9420BSAZ Specifications
| Function | Power Management IC - 2 Buck + 2 LDO + Linear Charger |
| Input Voltage | 5 V |
| Battery Charger Type | Linear CC/CV |
| Maximum Charge Current | 315 mA |
| CC/CV Programming | I2C programmable |
| Buck Regulators | 2 |
| LDO Regulators | 2 |
| Control Interface | I2C |
| Protection Features | Input OVP, OCP, thermal protection, JEITA |
| Operating Temperature | -40C to +85C |
| Package | HVQFN-24 (3 mm x 3 mm x 0.85 mm) |
| Mounting Type | Surface Mount |
| Min Package Quantity | 1400 (reel) |
| Min Order Quantity | 1400 |
| Budgetary Price | $1.36 USD at 10K quantity |
| Applications | Low-power microcontroller applications |
PCA9420BSAZ Pin Configuration
| Pin 1 | [DATA_NEEDED: pin 1 name] β [DATA_NEEDED: pin 1 description] |
| Pin 2 | [DATA_NEEDED: pin 2 name] β [DATA_NEEDED: pin 2 description] |
| Pin 3 | [DATA_NEEDED: pin 3 name] β [DATA_NEEDED: pin 3 description] |
| Pin 4 | [DATA_NEEDED: pin 4 name] β [DATA_NEEDED: pin 4 description] |
| Pin 5 | [DATA_NEEDED: pin 5 name] β [DATA_NEEDED: pin 5 description] |
| Pin 6 | [DATA_NEEDED: pin 6 name] β [DATA_NEEDED: pin 6 description] |
| Pin 7 | [DATA_NEEDED: pin 7 name] β [DATA_NEEDED: pin 7 description] |
| Pin 8 | [DATA_NEEDED: pin 8 name] β [DATA_NEEDED: pin 8 description] |
| Pin 9 | [DATA_NEEDED: pin 9 name] β [DATA_NEEDED: pin 9 description] |
| Pin 10 | [DATA_NEEDED: pin 10 name] β [DATA_NEEDED: pin 10 description] |
| Pin 11 | [DATA_NEEDED: pin 11 name] β [DATA_NEEDED: pin 11 description] |
| Pin 12 | [DATA_NEEDED: pin 12 name] β [DATA_NEEDED: pin 12 description] |
| Pin 13 | [DATA_NEEDED: pin 13 name] β [DATA_NEEDED: pin 13 description] |
| Pin 14 | [DATA_NEEDED: pin 14 name] β [DATA_NEEDED: pin 14 description] |
| Pin 15 | [DATA_NEEDED: pin 15 name] β [DATA_NEEDED: pin 15 description] |
| Pin 16 | [DATA_NEEDED: pin 16 name] β [DATA_NEEDED: pin 16 description] |
| Pin 17 | [DATA_NEEDED: pin 17 name] β [DATA_NEEDED: pin 17 description] |
| Pin 18 | [DATA_NEEDED: pin 18 name] β [DATA_NEEDED: pin 18 description] |
| Pin 19 | [DATA_NEEDED: pin 19 name] β [DATA_NEEDED: pin 19 description] |
| Pin 20 | [DATA_NEEDED: pin 20 name] β [DATA_NEEDED: pin 20 description] |
| Pin 21 | [DATA_NEEDED: pin 21 name] β [DATA_NEEDED: pin 21 description] |
| Pin 22 | [DATA_NEEDED: pin 22 name] β [DATA_NEEDED: pin 22 description] |
| Pin 23 | [DATA_NEEDED: pin 23 name] β [DATA_NEEDED: pin 23 description] |
| Pin 24 | [DATA_NEEDED: pin 24 name] β [DATA_NEEDED: pin 24 description] |
Typical Applications
PCA9420BSAZ is suitable for 6 applications: Battery-Powered Wearable Devices, Low-Power Microcontroller Systems, BLE Sensor Nodes and IoT Endpoints, Portable Health and Medical Monitors, Handheld and Portable Instruments, Smart Cards, Tags, and Compact Battery Products.
Battery-Powered Wearable Devices
The PCA9420BSAZ fits wearable electronics where a small lithium cell, tight board space, and multi-rail power demand converge. Its 315 mA linear charger matches the capacity of typical 100-300 mAh wearable cells, while JEITA temperature-adaptive charging protects the battery against user-worn thermal extremes. The two bucks supply the MCU core and RF/BLE rail, and the two LDOs power analog sensors such as heart-rate or motion devices with clean rails. In a 3 x 3 mm HVQFN-24, the entire charger-plus-PMIC function occupies roughly 9 mm2, replacing three or four discrete ICs. Charge current and rail voltages are tuned at runtime over I2C, allowing firmware power-budget optimization during different operating modes.
Recommended
Low-Power Microcontroller Systems
NXP positions the PCA9420 explicitly as the power management IC for low-power microcontroller applications. A typical system uses a 5V USB or adapter input feeding the charger and power path, while the two bucks generate the MCU core voltage (for example 1.2V or 1.8V) and an I/O rail, and the LDOs supply analog peripherals or a wireless module. I2C control lets firmware sequence rails and adjust output voltages to implement dynamic voltage scaling, directly reducing MCU active and sleep power. Protection features - input OVP, overcurrent, and thermal protection - guard the whole system from fault conditions on the adapter, and coordinated power-path behavior ensures the system boots even with a deeply discharged battery installed.
Recommended
BLE Sensor Nodes and IoT Endpoints
Battery-operated BLE sensor nodes benefit from the PCA9420BSAZ integration: one IC manages charging, the radio regulator rail, and clean sensor supplies, all under I2C supervision. The two bucks deliver higher conversion efficiency than LDOs for the radio and MCU load, extending battery life in always-on or duty-cycled nodes, while LDOs suppress switching ripple near sensitive analog front ends. Because the 315 mA maximum charge current is I2C-programmable, the same PCB supports different battery capacities across product SKUs without hardware changes. JEITA charging adds safety margin for outdoor IoT nodes exposed to ambient temperature swings, and input OVP protects against mis-wired or over-spec adapters in the field.
Recommended
Portable Health and Medical Monitors
Portable health monitors - pulse oximeters, glucose loggers, temperature patches - need predictable, protected battery charging plus quiet analog rails. The PCA9420BSAZ's I2C-programmable CC/CV lets the manufacturer precisely match the charge profile to the certified cell used in the medical device, and JEITA behavior adapts charging when the device is used near body-temperature limits or stored in vehicles. The two LDOs power analog front ends and biosensors with low-noise rails, while bucks handle the digital core efficiently to maximize battery runtime between charges. Integrated overvoltage, overcurrent, and thermal protection simplify safety documentation relative to a multi-chip discrete charging design, reducing validation effort in regulated product development cycles.
Recommended
Handheld and Portable Instruments
Handheld test instruments and portable data loggers running from single-cell lithium batteries use the PCA9420BSAZ to consolidate power management behind a single I2C interface. The 5V-tolerant input accepts USB charging, the charger maintains correct CC/CV behavior to 315 mA, and the bucks efficiently generate logic and display rails while LDOs serve precision analog sections such as ADC references and front-end amplifiers. I2C rail adjustability enables instrument firmware to trade performance against runtime - raising core voltage during measurement bursts and lowering it during idle. The compact HVQFN-24 keeps power section area small, leaving board space for connectors, displays, and shielding that dominate handheld instrument layouts.
Recommended
Smart Cards, Tags, and Compact Battery Products
Ultra-compact battery products - electronic shelf labels, smart tags, small remotes - are volume- and height-limited, and the PCA9420BSAZ's 0.85 mm maximum HVQFN-24 height fits thin enclosures that taller packages cannot. Its high integration allows a complete rechargeable power system on a few square centimeters of PCB, which matters when the battery and antenna occupy most of the board. The 315 mA charge limit suits small coin-adjacent or pouch cells, programmable via I2C so one hardware build covers several capacities. Buck efficiency preserves every milliamp-hour, LDOs protect low-noise sensing or radio circuits, and built-in OVP/OCP/thermal protection gives robust field reliability in sealed, non-serviceable products.
Recommended
Recommended Products Summary
Engineering reference data for PCA9420BSAZ β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PCA9420BS | PCA9420UK | PCA9420DS |
|---|---|---|---|---|
| Package | HVQFN-24 (3 x 3 x 0.85 mm) | HVQFN-24 - same | HVQFN-24 - same | HVQFN-24 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Topology | 2 Buck + 2 LDO + Linear Charger | 2 Buck + 2 LDO + Linear Charger | 2 Buck + 2 LDO + Linear Charger | 2 Buck + 2 LDO + Linear Charger |
| Max Charge Current | 315 mA | 315 mA | 315 mA | 315 mA |
| Input Voltage | 5 V | 5 V | 5 V | 5 V |
| Control Interface | I2C | I2C | I2C | I2C |
| Protection Features | OVP, OCP, thermal, JEITA | OVP, OCP, thermal, JEITA | OVP, OCP, thermal, JEITA | OVP, OCP, thermal, JEITA |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Single-IC charger plus 4-rail power management (vs Discrete charger + regulators)
- JEITA-compliant temperature-adaptive charging (vs PCA9420 family base part PCA9420BS)
- Firmware-controlled power architecture (vs Fixed-output charger ICs)
Design Notes
The PCA9420 uses a linear charger, so charge dissipation equals (VIN - VBAT) x ICHG. Estimated: at VIN = 5V, VBAT = 3.0V, and full 315 mA charge current, dissipation is approximately 0.63 W - significant for a 3 x 3 mm HVQFN-24. Use the I2C interface to reduce programmed charge current when VIN is high or the cell is deeply discharged, and pour solid ground copper under the exposed pad. Consult the NXP PCA9420 datasheet thermal section for theta-JA and junction limits before finalizing charge profiles.
Solder the HVQFN-24 exposed pad to a grounded thermal via array - this is both the main heat removal path for the linear charger and the return for the buck converters. Place input, battery, and buck output capacitors within 2 mm of their respective pins, keep buck switching loops minimal, and route the I2C SDA/SCL traces away from buck switch nodes. Per NXP layout guidance in the PCA9420 datasheet, follow the recommended external component values exactly, since charger termination sensing and JEITA thresholds depend on accurate battery-temperature sensing components.
Do not exceed the programmed CC/CV limits of the connected cell: charge current, charge voltage, and JEITA zones must be set in I2C registers to match the specific battery specification in your product. Ignoring input overvoltage protection settings can allow out-of-spec adapters to charge the battery; verify OVP thresholds against your adapter tolerance. Also note the 26-week factory lead time per NXP - qualify a distributor-stocked reel code early to avoid supply gaps in production, and confirm the exact orderable suffix (e.g., PCA9420BSAZ) for reel packing.
Compliance Information
Compliance statuses were not stated in the provided verified web data; confirm on the official NXP PCA9420BS product page or contact NXP.
