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NXP Semiconductors PCA9420BSAZ
- Part No.:
- PCA9420BSAZ
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
PCA9420BSAZ.pdf
- Description:
- PCA9420BS
- Quantity:
- Payment:
- Shipping:
Inventory:1,317
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Product details
Overview
PCA9420BSAZ 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), and two LDOs (LDO1: always-on 1.7–1.9 V, 1 mA; LDO2: 1.5–2.1 V or 2.7–3.3 V, 250 mA), all in a 3 mm × 3 mm HVQFN24 package.
For engineers reviewing the PCA9420BSAZ datasheet, PCA9420BSAZ pinout, PCA9420BSAZ application, or PCA9420BSAZ equivalent, this PMIC delivers JEITA-compliant charging, thermal regulation (75–90 °C warning, 95–125 °C shutdown), programmable input OVP (5.5 V or 6 V), and Fm+ I²C interface (up to 1 MHz) - critical for i.MX RT5xx/RT6xx and K4-family MCU power sequencing and battery-backed system design.
Technical Context
The PCA9420BSAZ implements a multi-rail power architecture with independent control logic for its linear charger, dual buck regulators, and dual LDOs, all coordinated via an on-chip main control block. Its ASYS input selection defaults to VIN or VBAT (whichever is greater), enabling seamless source handover during battery backup transitions.
Power state management includes four programmable mode settings (0–3) supporting dynamic rail enable/disable, voltage reconfiguration, ship-mode entry/exit, and watchdog timer control - triggered by ON pin falling edge, MODESEL0/MODESEL1 pins, or I²C commands. Thermal regulation uses configurable thresholds (2-bit warning, 3-bit shutdown) tied to external NTC sensing on TS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery Charger | Linear Li-ion, 315 mA max CC, programmable CV, JEITA-compliant with NTC-based cold/hot zone suspension |
| Buck Converter 1 (SW1) | 0.5–1.5 V or fixed 1.8 V output, 25 mV step resolution, 250 mA load capability, PFM for light-load efficiency |
| Buck Converter 2 (SW2) | 1.5–2.1 V or 2.7–3.3 V output, 25 mV step resolution, 500 mA load capability, supports battery supplemental mode |
| LDO1 | Always-on, 1.7–1.9 V output, 25 mV step, 1 mA max, powered by higher of ASYS or VBAT_BKUP |
| LDO2 | System LDO, 1.5–2.1 V or 2.7–3.3 V output, 25 mV step, 250 mA max, powered by ASYS |
| I²C Interface | Fm+ compliant, up to 1 MHz, supports register access for all configuration, status, and interrupt control |
| Operating Temp | −40 °C to +85 °C ambient, with programmable thermal warning (75–90 °C) and shutdown (95–125 °C) |
Pinout & Package
PCA9420BSAZ is housed in a 3 mm × 3 mm, 24-pin HVQFN package with exposed thermal pad (SOT905-1). Pin functions are validated per NXP datasheet Rev. 4.2 (2023).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 16) | Primary input supply | 20 V tolerant; powers ASYS and VBAT paths; bypassed with 2.2 µF/10 V capacitor |
| ASYS (Pin 17) | Secondary input domain | Supplies PSYS1, PSYS2, and LDO2; defaults to higher of VIN or VBAT; bypassed with 4.7 µF/10 V capacitor |
| SW1_OUT (Pin 19) | Buck 1 feedback node | Regulates core rail (0.5–1.5 V or 1.8 V); bypassed with 10 µF/6.3 V capacitor |
| SW2_OUT (Pin 3) | Buck 2 feedback node | Regulates system rail (1.5–2.1 V or 2.7–3.3 V); bypassed with 10 µF/6.3 V capacitor |
| LDO1_OUT (Pin 12) | Always-on analog supply | Provides 1.7–1.9 V for RTC or backup domains; powered by higher of ASYS or VBAT_BKUP |
| INTB (Pin 10) | Interrupt output | Open-drain signal indicating thermal warning, UVLO, OVP, or charge status events |
| SYSRSTn (Pin 11) | System reset output | Open-drain reset signal for connected MCU; asserted during power-up or fault conditions |
| ON (Pin 4) | Power-enable input | Active-low, 1 MΩ internal pull-up; initiates power-up sequence or long-press reset (4–16 s programmable) |
| SCL/SDA (Pins 5/6) | I²C interface | Fm+ bus (≤1 MHz); requires external 2.2–10 kΩ pull-ups to VDDIO_1 |
Key Features
| Feature | Design Value |
|---|---|
| JEITA-compliant battery charging | Enables safe Li-ion charging across temperature zones (0–10 °C, 10–45 °C, 45–60 °C) using external NTC on TS pin |
| Four programmable power modes | Mode Settings 0–3 allow dynamic reconfiguration of rail enables, voltages, ship-mode, and watchdog without firmware reload |
| Battery supplemental mode | Automatically enables VBAT-to-ASYS current path when VIN current limit is exceeded, maintaining system operation |
| Programmable input protection | Configurable VIN overvoltage protection (5.5 V or 6 V) and input current limiting (85–1105 mA in 7 steps) |
| Thermal regulation with dual thresholds | Separate 2-bit warning (75–90 °C) and 3-bit shutdown (95–125 °C) thresholds, both user-programmable via I²C |
Applications
| Wearable Health Monitor | i.MX RT6xx-Based Edge Node |
|---|---|
Use Scenario: Continuous ECG/PPG sensing with Bluetooth LE transmission and coin-cell backup. IC Role / Device Role / Timing Role: PCA9420BSAZ manages primary Li-ion charging, powers ultra-low-power MCU core (via SW1), supplies BLE radio (via SW2), and maintains RTC via always-on LDO1 during battery-only operation. Use Value: JEITA compliance prevents battery damage at body temperature extremes; ship-mode reduces quiescent current to <1 µA for multi-month shelf life. |
Use Scenario: Industrial sensor gateway with USB host, Ethernet PHY, and secure boot requiring multiple isolated voltage rails. IC Role / Device Role / Timing Role: PCA9420BSAZ sequences power-up of i.MX RT6xx core (1.0 V), IO (1.8 V), and peripheral rails (3.3 V), while monitoring VIN UVLO/OVP and providing thermal fault signaling via INTB. Use Value: Dual buck converters eliminate need for discrete DC-DC stages; I²C-configurable modes support runtime rail reconfiguration during sleep/wake transitions. |
| K4-Family MCU Smart Lock | Low-Power RTOS Development Platform |
Use Scenario: Battery-powered door lock with NFC, motor driver, and tamper detection, operating in −25 °C to +70 °C environments. IC Role / Device Role / Timing Role: PCA9420BSAZ provides regulated 1.8 V (LDO1) for secure element, 3.3 V (SW2) for NFC transceiver, and 1.0 V (SW1) for K4 MCU core, with thermal shutdown preventing overheating during motor actuation. Use Value: Programmable thermal thresholds (95–125 °C shutdown) match motor driver thermal envelope; ON pin long-press resets MCU after firmware hang without physical access. |
Use Scenario: Evaluation platform for FreeRTOS-based sensor fusion, requiring rapid prototyping of power states and rail dependencies. IC Role / Device Role / Timing Role: PCA9420BSAZ serves as reference PMIC for i.MX RT5xx, enabling developers to validate mode-switching behavior (e.g., Mode 0 → Mode 2 for deep-sleep), monitor charge status via I²C, and debug rail sequencing with SYSRSTn and INTB signals. Use Value: Four hardware-selectable modes (via MODESEL0/MODESEL1) simplify lab testing of power state transitions without I²C scripting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power management IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | Triple buck + dual LDO; no integrated battery charger; 2.25–6 V input; fixed 1.2/1.5/1.8/2.5/3.3 V outputs | Requires external charger IC for battery-backed systems; lacks JEITA, thermal warning, or ship-mode features | Choose when battery charging is handled separately and fixed-output simplicity outweighs programmability |
| MCP16502-500/ADJ | Dual buck only (no LDOs or charger); 2.7–5.5 V input; I²C-programmable 0.6–3.6 V outputs; 500 mA per channel | No battery management, no always-on LDO, no thermal regulation - limited to primary-rail-only applications | Choose for cost-sensitive, non-battery systems needing only two adjustable bucks with minimal footprint |
Compared with TPS65023RSBR and MCP16502-500/ADJ, PCA9420BSAZ uniquely integrates battery charging, thermal-aware operation, and four programmable power modes - making it the only option among the three that supports full battery-backed MCU sequencing with JEITA compliance and sub-1 µA ship-mode current.
Availability
PCA9420BSAZ is available at Aetrix Electronics and suitable for wearable health monitors, i.MX RT6xx-based edge nodes, and K4-family MCU smart locks requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for PCA9420BSAZ 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 MCUs and power management ICs.
The PCA9420BSAZ belongs to NXP's dedicated PMIC product line targeting low-power microcontroller platforms like i.MX RT5xx/RT6xx and K4-family MCUs, designed to consolidate battery charging, multi-rail conversion, and intelligent power sequencing into a single compact device.
FAQ
What is the maximum charging current supported by the PCA9420BSAZ linear charger?
The PCA9420BSAZ linear charger supports a maximum constant-current (CC) charging current of 315 mA, programmable in 5 mA steps via I²C registers. This value is confirmed in Section 2 (Features and benefits) and Figure 1 (Simplified block diagram) of the official datasheet Rev. 4.2. The charger also includes pre-charge current threshold programming and automatic recharge voltage/termination current configuration - all essential for safe single-cell Li-ion battery management in the PCA9420BSAZ.
Does the PCA9420BSAZ support JEITA-compliant charging, and how is it implemented?
Yes, the PCA9420BSAZ supports JEITA-compliant charging through its TS (temperature sense) pin, which interfaces with an external NTC thermistor. As described in Section 8.6, the device monitors voltage at TS to detect four temperature zones (cold: 0 °C, cool: 10 °C, warm: 45 °C, hot: 60 °C) and adjusts charging current or CV voltage accordingly - suspending charge outside safe ranges. This behavior is fully programmable and verified in the PCA9420BSAZ datasheet Rev. 4.2, ensuring safe operation across environmental conditions.
What are the output voltage ranges and current capabilities of the two buck converters in the PCA9420BSAZ?
The PCA9420BSAZ integrates two buck converters: SW1 (core) delivers 0.5–1.5 V in 25 mV steps or a fixed 1.8 V, up to 250 mA; SW2 (system) delivers either 1.5–2.1 V or 2.7–3.3 V in 25 mV steps, up to 500 mA. These specifications are explicitly stated in Section 2 (Features and benefits) and Table on page 3 of the PCA9420BSAZ datasheet Rev. 4.2. Both regulators use PFM for high light-load efficiency and support battery supplemental mode to maintain output during VIN current limiting.
How does the PCA9420BSAZ handle power source selection between VIN and VBAT?
The PCA9420BSAZ automatically selects the higher of VIN or VBAT to power its ASYS domain - the common input for SW1, SW2, and LDO2 - as stated in Section 8.3. This seamless handover is hardware-controlled by an internal selection circuit and ensures uninterrupted operation during AC adapter removal or battery insertion. The ASYS input source can also be overridden via I²C (ASYS_INPUT_SEL[1:0]), but defaults to auto-selection after reset - a key reliability feature confirmed in the PCA9420BSAZ functional description.
What package type and pin count does the PCA9420BSAZ use, and is it RoHS-compliant?
The PCA9420BSAZ uses a 3 mm × 3 mm, 24-pin HVQFN package with exposed thermal pad (SOT905-1), as specified in Table 1 (Ordering information) and Figure 2 (pinout) of the PCA9420BSAZ datasheet Rev. 4.2. It is RoHS-compliant and halogen-free, consistent with NXP's standard environmental compliance for commercial-grade PMICs. This package enables high-density PCB layouts while supporting efficient thermal dissipation - critical for compact battery-powered designs using the PCA9420BSAZ.
PCA9420BSAZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- -
- Current - Supply:
- 4.5µA
- Voltage - Supply:
- 3.3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-HVQFN (3x3)
PCA9420BSAZ FAQ
1.How can I place an order for PCA9420BSAZ through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9420BSAZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PCA9420BSAZ reliable?
The price and inventory of PCA9420BSAZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9420BSAZ is usually 5 days.
3.What payment methods are accepted for PCA9420BSAZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9420BSAZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9420BSAZ?
PCA9420BSAZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9420BSAZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PCA9420BSAZ?
For technical support, including PCA9420BSAZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9420BSAZ requirements.
6.How does Aetrix verify that PCA9420BSAZ is sourced from the original manufacturer or authorized distributors?
All PCA9420BSAZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PCA9420BSAZ meets industry standards.
7.What is the process for return or replacement of PCA9420BSAZ?
All PCA9420BSAZ units undergo pre-shipment inspection (PSI). If there is an issue with PCA9420BSAZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PCA9420BSAZ part is unused and in its original packaging.
Return procedure for PCA9420BSAZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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